base64 characters regex

Simply enter your data then push the encode button. If you have a malicious .msi file you could look up the corresponding ProductCode, calculate the ProductID and hunt in the registry for artifacts. *)",true,false,false]},{"op":"HTTP request","args":["GET","https://ja3er.com/search/$R0","","Cross-Origin Resource Sharing",false]},{"op":"JSON Beautify","args":[" ",false]}]. *)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$R0$R1$R2"},"$R1 $R0 $R2",true,false,true,false]}]. Here '30' is an arbitrary number that can be adjusted according to the script. Add extracted strings to a collection in order to generate a report. [{"op":"Microsoft Script Decoder","args":[]},{"op":"Subsection","args":["(?<=\\(\\\")(.*? The malware author here has attempted to fool automated analysis by slicing the recognisable Base64 encoded PE header into character codes. Simply upload the file to CyberChef. The first uses the captured email C2 traffic to derive the encryption key, and the second applies that key to encrypted data. Source: https://github.com/L-codes/Neo-reGeorg, [{"op":"Regular expression","args":["User defined","(?<=\\{)([\\-\\d,]+)(?=\\})",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"(-\\d+)"},"$1 256",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":","},"\\n",true,false,true,false]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"Sum","args":["Space"]},{"op":"Merge","args":[true]},{"op":"From Charcode","args":["Line feed",10]}]. This could be reversed it you wanted to translate 'regular' IP addresses to search in DNS PTR records. Visit our blog to get informative insights on the latest malware samples, threat intel, threat actors tools and more. Strings identifies Base64 which is then extracted and decoded to pull out the second stage. *)",true,false,true]},{"op":"Find / Replace","args":[{"option":"Regex","string":". Matches any one element separated by the vertical bar (, Substitutes the substring matched by group, Substitutes the substring matched by the named group. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? Quantifiers include the language elements listed in the following table. Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. Asking for help, clarification, or responding to other answers. Here we can use a simple recipe to change a 38-digit X509SerialNumber to its hexadecimal equivalent X.509 certificate serial number. Pivot from here to other log sources like proxy logs, sysmon, EDR, DNSyou've got all those right? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. : ZZ ZZ ZZ ZZ))",true,false,true]},{"op":"Register","args":["(? Thankfully, @cnotin has created a fantastic recipe to parse SDDL output to make it much easier to understand, read, and interpret. Leverage our models to see just how much time and expense would be required for SOC personnel to do what FDR performs automatically. For more information, see Grouping Constructs. To encode binaries (like images, documents, etc.) )(?=\\))|[a-zA-Z0-9+/=]{20,}",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\n"},"",true,false,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"SHA2","args":["256",64,160]}]. Gain an understanding of FDR's foundational technologies - including Deep File InspectionTM and RetroHuntingTM - which work in concert to stop file-borne attacks. Semantics of the `:` (colon) function in Bash when used in a pipe? The input string includes the substring "this? hbspt.cta.load(4270940, '9526f97b-3f3d-406e-ac97-1af154eb8265', {"useNewLoader":"true","region":"na1"}); For organizations who prefer to take advantage of our in-house expertise and experience, FDR is available as an InQuest service. The following table lists the miscellaneous constructs supported by .NET. Close the end-user security gap by stopping file-borne breaches and incidents stemming from malware, ransomware, exploits, phishing lures, scams, fraud and data loss violations. Named backreference. ): Base64 has become the de facto standard in encoding binary data in places where text is required or expected. :[a-zA-Z0-9+\/]{3}=), Non-capturing group (? Once you've identified the 'out of place data' (screenshot one), you can then modify your recipe to suit your needs. Try it with the string: {6732E1E0-6629-4B92-A25F-40377D162D15}. Losing this one-to-one correspondence means that you can't just encode every component of a regex and be done with it: what happens when a regex component matches a variable-length string? Zipped File: cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54_183SnuOIVa.bin.gz, Sample: SHA256 cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54, https://www.hybrid-analysis.com/sample/cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54?environmentId=120, [{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Generic Code Beautify","args":[]}]. Characters of the Base64 alphabet can be grouped into four groups: Uppercase letters (indices 0-25): ABCDEFGHIJKLMNOPQRSTUVWXYZ Lowercase letters (indices 26-51): abcdefghijklmnopqrstuvwxyz Digits (indices 52-61): 0123456789 Special symbols (indices 62-63): +/ It is very important to note that the Base64 letters are case sensitive. This multi-layered webshell is a good case for subsections and jumps. (For more fun reading, it's interesting to point out that different processors order multi-byte values in different ways. The match must occur at the end of the string. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. That's where b64re comes into play: what if you want to find that encoded malicious payload inside a binary blob? Either for ease of letting your mates access your guest wifi, or for any Red Team that needs to add tempting convenience to a rogue access point! Extract, edit, replace, or delete text substrings. :00 10 00 01 00 02 )((?:[09A-F]{2}\\s){2}|(? "},"H",true,false,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true,false]},{"op":"Gunzip","args":[]},{"op":"Merge","args":[true]},{"op":"Regular expression","args":["User defined","(?<=0\\n*x)([a-f0-9]{2})(?=,|\\))",true,true,false,false,false,false,"List matches"]},{"op":"From Hex","args":["Auto"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^."},"M",true,false,false,false]}]. CyberChef Docker Image (untested!) How to search for all text lines that start with a tab character? )",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"(. ^2^ This symbol is more colloquially called "lamp" and it starts the beginning of a comment in the APL programming language. Look for zero to three occurrences of the decimal digits 0 through 9. Go. Due to Same Origin Policy (SOP) or lack of Cross-Origin Resource Sharing configuration many do not work. Don't manually carve out your Squid cache objects. :00 1d 00 03 00 40)((?:.*?)(?=00)|(? More info about Internet Explorer and Microsoft Edge, any single character in the Unicode general category or named block specified by, any single character that is not in the Unicode general category or named block specified by, Regular Expressions - Quick Reference (download in Word format), Regular Expressions - Quick Reference (download in PDF format). For example, to match "\abc", a regular expression for regexp can be "^\abc$". Here, we have an Apache log file with a timestamp that doesn't lead to useful temporal analysis with other log files: the date format is not sortable, its enclosed in square brackets and it's in UTC +1 not a standard UTC. Source: any.run Taking the output from Olevba we can regex, convert, loop and decode until we reach out PowerShell with its IOC goodies. Matches the previous element zero or one time. Character classes include the language elements listed in the following table. Matches the value of a named expression. What happens if a manifested instant gets blinked? [{"op":"Find / Replace","args":[{"option":"Regex","string":","},"\\n",true,false,true,false]},{"op":"Sort","args":["Line feed",false,"Alphabetical (case insensitive)"]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"Register","args":["([\\s\\S]*)",true,false,false]},{"op":"Pseudo-Random Number Generator","args":[32,"Hex"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"(. Searchable Formats: For more information about inline and RegexOptions options, see the article Regular Expression Options. i can see that the regex it's pretty the same, sorry for haven't checked on stackoverflow before. Is there any evidence suggesting or refuting that Russian officials knowingly lied that Russia was not going to attack Ukraine? We don't write fluff. This webpage lists career opportunities available at InQuest, offering a chance for job seekers to join a team focused on providing innovative solutions in the field of information security. :ZZ ZZ ZZ ZZ))",true,false,false]},{"op":"Register","args":["(? Using the HTTP Request function and Registers we can enrich out data with that from an API or external resource. A fantastic learning recipe. Finally, we don't allow any of those Base64 characters to follow immediately afterward. Yes, with Add Text to Image this can be done. )\s\1\b can be interpreted as follows: The Regex.Matches method is called with regular expression options set to RegexOptions.IgnoreCase. : ZZ ZZ ZZ ZZ))",true,false,true]},{"op":"Register","args":["(? Using subsection the full recipe is kept for any further analysis, but a simple 'Extract URLs' lets us see the (unsurprising) Discord destination. In other words, by Postel's Law, you couldn't assume that everyone you spoke to could handle eight-bit bytes. Well, if you basically just want to check for character set correctness and some basic prefix/suffix checking, then my short one would suffice. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. [{"op":"Unzip","args":["",false]},{"op":"Regular expression","args":["User defined","(?<=Target\\=\\\")(. :00 13 00 02 00 04 )((?:[09A-F]{2}\\s){4}|(? Labs is an amazing resource, with a plethora of useful tools and intelligence offerings. Did Madhwa declare the Mahabharata to be a highly corrupt text? But for things like binary files (and, I don't know, languages written in things other than the basic English alphabet plus a few symbols, used by billions and billions of people) it wouldn't work. :00 12 00 01 00 02 )((?:[09A-F]{2}\\s){2}|(? Ignore unescaped white space in the regular expression pattern. 608 words 3 mins read times read. *\\);",true,false,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Regex","string":",|\\(|\\);"}," ",true,false,true,false]},{"op":"From Charcode","args":["Space",10]},{"op":"YARA Rules","args":["rule SuspiciousPowerShell {\n meta:\n description = \"Testing Yara on Cyberchef for Powershell\"\n strings:\n $a1 = \"[System.Reflection.Assembly]\" ascii\n $a2 = \"IEX\" ascii nocase\n $a3 = \"powershell.exe -w hidden -ep bypass -enc\" ascii\n condition:\n 2 of them\n}",true,true,true,true]}]. If you have a layered obfuscation and use two subsections you can merge the second layer only without losing your first subsection later. But it's no match for his CyberChef recipe. Not everyone thinks of CyberChef as a tool for log file analysis. FireFox Look for zero or one occurrence of the decimal separator followed by at least one decimal digit. All matches (don't return after first match), m modifier: multi line. : ZZ ZZ ZZ ZZ))",true,false,true]},{"op":"Register","args":["(? Nested subsections is a feature available in versions >= 9.46.0. [{"op":"Register","args":["(. Let's give it a shot: curl "https://labs.inquest.net/api/yara/base64re?option=widen_big,instring=ABC", And here's what we get: ([\x2b\x2f-9A-Za-z][AQgw]B{2}AEIAQ[\x2b\x2f-9w-z]|[\x2b\x2f-9A-Za-z]{2}[048AEIMQUYcgkosw]AQ{2}BCAE[M-P]|AE{2}AQgBD). Source: https://twitter.com/mattnotmax/status/1564915219507253248 Do it now. Although I'm assuming you are trying to detect it because it might not be a valid source in which case even something like @HeyThisIsMyTweeterHandle might be detected as base64. Source: https://twitter.com/mattnotmax/status/1377829935780274176, [{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Subsection","args":["(?<=\\\\x)([a-fA-F0-9]{2})",true,true,false]},{"op":"From Hex","args":["\\x"]},{"op":"Merge","args":[]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\\\x"},"",true,false,true,false]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{30,}=",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"From HTML Entity","args":[]},{"op":"Merge","args":[]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{30,}",true,true,false]},{"op":"Reverse","args":["Character"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Label","args":["decompress"]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["decompress",3]},{"op":"ROT13","args":[true,true,false,13]}]. What's the purpose of a convex saw blade? Splunk TA (Technology Add-on). An Encoding is a radix 64 encoding/decoding scheme, defined by a 64-character alphabet. )(?=\\\")",true,true,false]},{"op":"Reverse","args":["Character"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Label","args":["jump"]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["jump",2]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]}]. Once they have matched, atomic groups won't be re-evaluated again, even when the remainder of the pattern fails due to the match. You can specify an inline option in two ways: The .NET regular expression engine supports the following inline options: Miscellaneous constructs either modify a regular expression pattern or provide information about it. "Emojis, so hot right now", says the meme (see recipe 38 for proof) but this interesting sample found by TomU through his ongoing research into DESKTOP-group has a few tricks up its sleeve. Scan this QR code to download the app now. This allows an asute professional the ability to decrypt files if they have captured email traffic as the communication is not encrypted. DebugPointer.com is a collection of programming resources, code snippets and computer science related articles. For example, ${base64:encodeString("mycredential"), false, "UTF-8")} uses Base64 to encode mycredential using the UTF-8 character set such that the encoded data is not URL safe. Here @Max_Mal_ provides a quick way to extract the second stage URL from the maldoc without executing it. Feb 11, 2022 at 7:57 I get that, but the odds that the base64 block is legitimate are quite small. A list of cyber-chef recipes and curated links. Source 1: https://www.microsoft.com/security/blog/2021/03/04/goldmax-goldfinder-sibot-analyzing-nobelium-malware/ Original decoding done by @pmelson in Python and converted to CyberChef. Various encoding schemes were created to support this, but Base64 enters the story with the advent of Privacy Enhanced Email in 1987. Else it parses out the second type. He is fascinated by JavaScript, Operating System, Deep Learning, AR/VR. any character except newline \w \d \s: word, digit, whitespace Background: https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11. Why doesnt SpaceX sell Raptor engines commercially? Let's see what this beautiful bit of regex-fu turns into when Base64 encoded: Now, aren't you glad you didn't have to write all that yourself? Matches the value of a numbered subexpression. This section can then be merged together to continue on the whole input. The key point to consider is there are two variables using different rounds of obfuscation. Source 1: @WikiJM Subsections and Merges are powerful tools in CyberChef that allow the application of ingredients to a selection of data rather than the whole input file. This was absolutely fantastic, but ran into the problem that most encryption algorithms are designed to work with eight-bit bytes, and since mail couldn't assume an eight-bit-clean-channelwell, you can see where this is going. Google uses its own timestamp, I call ei time, which it embeds in the URL. With RegEx, you can match strings at points that match specific characters (for example, JavaScript) or patterns (for example, NumberStringSymbol - 3a&). A pattern consists of one or more character literals, operators, or constructs. Test string examples for the above regex-, Here is a detailed explanation of the above regex-. PowerShell commands might be embedded inside an Office document, and Base64 encoded for the sake of obfuscation. Try out some PCAPs from the amazing www.malware-traffic-analysis.net. Credit: @DidierStevens You can shorten the recipe further by using loops to jump the multiple rounds of Raw Inflate. Provides information on the set of characters, operators, and constructs that you can use to define regular expressions. First the code looks for a simple regex 'bxor' to then jump to the appropriate section of the recipe. Didier Stevens demonstrates the amazing simplicity and usefulness of CyberChef by extracting URLs from OOXML documents (e.g. See how FDR closes the user security gap - which delivers substantial business, security personnel, and SOC ROI benefits. The former method returns a System.Text.RegularExpressions.Match object that provides information about the matching text. Did you know, 75% of an organization's malware is delivered via email? You signed in with another tab or window. When do we want it? Source 2: https://twitter.com/pmelson/status/1078776229996752896, Also see more example of loops over Base64: https://twitter.com/QW5kcmV3/status/1079095274776289280 (Credit: @QW5kcmV3), [{"op":"Label","args":["top"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["top",28]},{"op":"Generic Code Beautify","args":[]}]. See the security solutions where FDR most excels. . !') Here is the result set. The outer parentheses define this expression as a capturing group or a subexpression. For more information, see Anchors. Apart from emoji obfuscation, it downloads a snippet of code from pastee.ee which has the final key to its de-obfuscation. In this article let's understand how we can create a regex for base64 strings and how it can be matched. I also like the extensive use of Comments (something that I'm always advocating, but often not implementing!) Source: https://gist.github.com/glassdfir/f30957b314ec39a8aa319420a29ffc76, [{"op":"Conditional Jump","args":["^(\\x01|\\x02)",true,"Error",10]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^(\\x02.{23})(.)"},"$1",false,false,false,false]},{"op":"Subsection","args":["^.{24}(. On a computer whose current culture is English - United States (en-US), the example dynamically builds the regular expression \$\s*[-+]?([0-9]{0,3}(,[0-9]{3})*(\.[0-9]+)?). Source 1: https://pastebin.com/R5Sez8PH (sorry: no longer available! If you want to extract the URLs, normally you'd use the 'Extract URLs' operation which give us 99% of what we want. Source: https://twitter.com/unmaskparasites/status/1370151988285992960, [{"op":"Subsection","args":["(?<=\\\")([\\w\\\\]+)(?=\\\")",true,true,false]},{"op":"From Hex","args":["\\x"]},{"op":"Merge","args":[]},{"op":"Subsection","args":["(?<=\\\")([a-f0-9\\$]+)(?=\\\")",true,true,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$"},",",true,false,true,false]},{"op":"From Hex","args":["Comma"]}]. So once selected we reverse the string and use regular expression capture groups to select every third character. : ZZ ZZ ZZ ZZ))",true,false,true]},{"op":"Register","args":["(? Source: 00000915 (output should be TrueCrypt_Setup_7.1a.exe with SHA256 e95eca399dfe95500c4de569efc4cc77b75e2b66a864d467df37733ec06a0ff2), [{"op":"To Hex","args":["None"]},{"op":"Regular expression","args":["User defined","(?<=0D0A0D0A). For things like ASCII text this wasn't a problem because ASCII could be safely transmitted in seven bits. //-->\\[\\]{}\\s\\x7F-\\xFF]*(?:[.!,?]+[^.!,?'\"<>\\[\\]{}\\s\\x7F-\\xFF]+)*)? Java uses signed integers so character codes need to be converted to unsigned values before we can use the 'From Character Code' operation. A blob of base64 with some minor bytes to be substituted. :00 23 00 01 00 02)((?:.*?)(?=00)|(? Much could be written about the site, and much has beenbut not about this part right here: What is the "Base64 Regular Expression Generator"? A pattern consists of one or more character literals, operators, or constructs. The webpage showcases the events InQuest is participating in, including trade shows, conferences, and webinars, offering opportunities for attendees to learn more about the company's products and services. The webpage details InQuest's 365x24x7 support, providing information on the company's commitment to ensuring reliable and efficient assistance to customers around the clock. Group4 : Adresse. And yes, @HeyThisIsMyTweeterHandle would validate aswell, but that's not a problem for me, as long as it is valid (with proper length aswell) base64. A very common scenario: extract Base64, inflate, beautify the code. CyberChef can produce disassembly in 16, 32 or 64 bit and voil! What do we want? BASE64_ENCODE (Transact SQL) Additional resources. Emotet is back! Problems are what happens. *?<\\/w:t>",false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"3-"},"",true,false,true,false]},{"op":"From HTML Entity","args":[]},{"op":"Regular expression","args":["User defined","(?:[A-Za-z0-9+/]{4})*(? Solving Simple Crypto Challenges with CyberChef Grouping constructs delineate subexpressions of a regular expression and typically capture substrings of an input string. This commingling of bits is the hardest part of the whole process. :00 03 00 02 00 04 )((?:[09A-F]{2}\\s){2}|(? The match must occur at the end of the string or before. )(?=')",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"ROT13","args":[true,true,13]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+=/]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]}]. Certain error messages will start with a "?" Something like this should do (does not check for proper length! *)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":". Okay, you probably know the answer to all of those questions (and if not, that's okay, we'll cover the answers cursorily here), but you may not know what all those words mean in that particular order. Because of its ubiquity, Base64 has become the de facto standard for encoding of binary data in text-centric areas. CyberChef is the self-purported 'Cyber Swiss-Army Knife' created by GCHQ. We've also provided this information in two formats that you can download and print for easy reference: The backslash character (\) in a regular expression indicates that the character that follows it either is a special character (as shown in the following table), or should be interpreted literally. Are you sure you want to create this branch? Less of a recipe and more of a technique. Details about InQuest's customer testimonials, offering insight into the experiences and successes of the company's clients and their satisfaction with its products and services. CyberChef can use labels to identify parts of the recipe and then loop back to perform operations multiple times. Regular Expression to . Assume that a mailing list contains names that sometimes include a title (Mr., Mrs., Miss, or Ms.) along with a first and last name. How appropriate is it to post a tweet saying that I am looking for postdoc positions? Conveniently packaged to address specific and comprehensive file-borne attack challenges. A request for assistance led to this recipe which uses Registers, HTTP request and some Regex to select a random character from a six-byte string. Something I forgot to mention is that base64 encoded strings have "=" characters only at the end, and have 2 at most. You can see where this is going. This regex will only allow the Major.Minor.Patch pattern to pass. Hate them? Look for a single occurrence of the decimal separator. Regex from the Mail::RFC822::Address: regexp-based address validation Available in v9.30+ a modern update to Recipe 22. : ZZ ZZ ZZ ZZ))",true,false,true]},{"op":"Register","args":["(? Or on the wire? A handy recipe provided by @StefanKelm puts the 'file' back in 'fileless' (yes, I thought of that one myself, we are up to recipe 32 my friends). To go a bit further, let's try finding a non-malicious invocation of Notepad: This is interesting: the regular expression didn't match, and we avoided a false-positive! FDR provides value that flows straight to your bottom: avoids costs associated with file-borne malware, ransomware, exploits, phishing lures, scams, fraud, and data loss breaches and incidents; saves massive amounts of time for stretched SOC analysts and threat hunters; and reduces cybersecurity upfront and operating costs, and drives up the efficacy and value of your adjacent security solutions. Don't get me started on how the common two-byte encodings deal with that) So, that raises a question: if a character is stored in two bytes, how are the bytes ordered? Credit: @cybercdh & @Shadow0pz By unzipping the file and filtering out the 'known good' the remaining URLs can be inspected. The System.Web.RegularExpressions namespace contains a number of regular expression objects that implement predefined regular expression patterns for parsing strings from HTML, XML, and ASP.NET documents. Mixed encoding with both hexadecimal and octal in the one set! For more information, please see our Windows event logs. Given this, the it would be great if we could simply look through the whole file for Base64-encoded string Start-Process -filePath "calc.exe". Description Returns the ASCII code for the first character or byte in value. Some systems default to one ordering and some to the other Unicode provides a way to indicate which ordering a document is using, but that is often omitted. You'll receive daily reports on threats that bypassed your defenses as well as recommendations for closing the gap. The InQuest Integrated Cloud Email Security (ICES) platform and automated threat hunting feature used at City of Danville. Every organization - whether public or private sector - has a set of modern security concerns. Let's think about how we can obfuscate the payload above (slightly simplified for the sake of space): Start-Process "calc.exe" Might be written as start-process "calc.exe" or even sTaRt-PrOcEsS 'calc.exe' that is, with a bunch of extra space and case flipping. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Recipe 1 - Extract base64, raw inflate and code beautify, Recipe 4 - Group Policy Preference passwords, Recipe 7 - COM scriptlet to disassembled x86 assembly, Recipe 8 - Extract hexadecimal, convert to hexdump for embedded PE file, Recipe 9 - Reverse strings, character substitution, from base64, Recipe 10 - Extract object from Squid proxy cache, Recipe 11 - Extract GPS Coordinates to Google Maps URLs, Recipe 13 - Parsing DNS PTR records with Registers, Recipe 16 - Decoding PHP gzinflate and base64 webshells, Recipe 17 - Extracting shellcode from a Powershell Meterpreter Reverse TCP script, Recipe 18 - Recycle Bin Parser with Subsections and Merges, Recipe 19 - Identify Obfuscated Base64 with Regular Expression Highlighting, Recipe 20 - Using Yara rules with deobfuscated malicious scripts, Recipe 21 - Inline deobfuscation of hex encoded VBE script attached to a malicious LNK file, Recipe 22 - JA3 API search with HTTP Request and Registers, Recipe 23 - Defeating DOSfuscation embedded in a malicious DOC file with Regular Expression capture groups, Recipe 24 - Picking a random letter from a six-byte string, Recipe 26 - Extracting and Decoding a Multistage PHP Webshell, Recipe 27 - Decoding an Auto Visitor PHP script, Recipe 28 - De-obfuscation of Cobalt Strike Beacon using Conditional Jumps to obtain shellcode, Recipe 29 - Log File Timestamp Manipulation with Subsections and Registers, Recipe 30 - CharCode obfuscated PowerShell loader for a Cobalt Strike beacon, Recipe 31 - Deobfuscate encoded strings in .NET binary, Recipe 32 - Extract malicious Gootkit DLL from obfuscated registry data, Recipe 33 - Identify embedded URLs in Emotet PowerShell script, Recipe 34 - Analysing OOXML Files for URLs, Recipe 35 - Decrypting REvil PowerShell ransomware sample, Recipe 36 - Create a CyberChef Password Generator, Recipe 37 - From Sandbox zipped email to malicious URL, Recipe 38 - Planes, Skulls and Envelopes - Live and Let PowerShell, Recipe 39 - Decrypt GoldMax aka Sunshutte encrypted configuration files, Recipe 41 - PHP mixed hexadecimal and octal encoding, Recipe 42 - PHP Webshell with layered obfuscation, Recipe 43 - Magento skimmer deobfuscation, Recipe 44 - Decrypting JobCrypter Ransomware, Recipe 45 - Sqiud Proxy Log Timestamp Conversion, Recipe 46 - Tailoring your regex for the situation, Recipe 49 - Disassemble an EICAR test file, Recipe 50 - Parse Security Descriptor Definition Language output, Recipe 55 - Debofuscating BazarLoader aka TA551 maldoc, Recipe 56 - Calculate and lookup JA3 or JA3S hash values from a PCAP, Recipe 58 - Extract IcedID second stage URL from a maldoc, Recipe 59 - Parse Cobalt Strike beacon configuration, Recipe 60 - Decode URLs protected by Microsoft Safelinks, Recipe 61 - Extract second stage URLs from Qakbot Excel maldocs, Recipe 63 - Extract URLs from Dridex obfuscated VBS, Recipe 64 - Convert Strings to VirusTotal Grep queries, Recipe 65 - Deobfuscate MSF Venom PowerShell reverse shell payload, Recipe 67 - Converting a MSI ProductCode to Registry Installer ProductID, Recipe 68 - Converting Java signed byte arrays, Recipe 69 - Extracting DLL payload from a Bumblebee Powershell script, Recipe 70 - Extracting endpoints from Android network security config, https://gist.github.com/jonmarkgo/3431818, https://twitter.com/cyb3rops/status/1036642978167758848, https://twitter.com/pmelson/status/1078776229996752896, https://twitter.com/QW5kcmV3/status/1079095274776289280, https://bitofhex.com/2018/05/29/cyberchef/, https://gist.githubusercontent.com/JohnLaTwC/aae3b64006956e8cb7e0127452b5778f/raw/f1b23c84c654b1ea60f0e57a860c74385915c9e2/43cbbbf93121f3644ba26a273ebdb54d8827b25eb9c754d3631be395f06d8cff, https://twitter.com/JohnLaTwC/status/1062419803304976385, https://twitter.com/ScumBots/status/1081949877272276992, https://twitter.com/pmelson/status/1076893022758100998, https://twitter.com/QW5kcmV3/status/949437437473968128, https://twitter.com/a_tweeter_user/status/1100751236687642624, https://github.com/LordWolfer/webshells/blob/b7eefaff64049e3ff61e90c850686135c0ba74c4/from_the_wild1.php, http://sandsprite.com/blogs/index.php?uid=7&pid=152, https://twitter.com/ScumBots/status/1121854255898472453, https://gist.github.com/glassdfir/f30957b314ec39a8aa319420a29ffc76, https://twitter.com/pmelson/status/1167065236907659264, https://twitter.com/ScumBots/status/1168528510681538560, Hiding Malicious code using windows CMD - Dosfuscation, https://twitter.com/mattnotmax/status/1242031548884369408, https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11, https://twitter.com/0xtornado/status/1255866333545316352, https://twitter.com/cybercdh/status/1338885244246765569, https://twitter.com/Shadow0pz/status/1338911469480661000, https://github.com/StefanKelm/cyberchef-recipes, https://twitter.com/Cryptolaemus1/status/1319357369902649344, https://twitter.com/neonprimetime/status/1365351048525791232, https://www.microsoft.com/security/blog/2021/03/04/goldmax-goldfinder-sibot-analyzing-nobelium-malware/, https://www.fireeye.com/blog/threat-research/2021/03/sunshuttle-second-stage-backdoor-targeting-us-based-entity.html, https://twitter.com/cyber__sloth/status/1367904890157211654, https://twitter.com/JCyberSec_/status/1368963598475739137, https://twitter.com/mattnotmax/status/1377829935780274176, https://twitter.com/unmaskparasites/status/1370151988285992960, https://twitter.com/malwarelab_eu/status/1383732397510828033, https://twitter.com/mattnotmax/status/1389547145183830016, https://www.linuxquestions.org/questions/linux-server-73/sample-squid-proxy-log-files-837345/, https://app.any.run/tasks/b6d9a548-722c-4066-9448-11a966be2a73/, https://twitter.com/mattnotmax/status/1394986367604695042, https://twitter.com/c_APT_ure/status/1362146658117701632, https://blog.nintechnet.com/anatomy-of-the-eicar-antivirus-test-file/, https://twitter.com/cnotin/status/1387002797175021569, https://gist.github.com/tomekziel/eaaabd55f2d244adf5fcf7db4db0387f, https://nullsec.us/windows-event-id-1029-hashes/, https://twitter.com/mattnotmax/status/1426763382082850816, Cobalt Strike beacon configuration parsing with CyberChef, https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/safe-links?view=o365-worldwide, https://twitter.com/cluster25_io/status/1468248610814971916, https://twitter.com/guelfoweb/status/1468959342514749451, https://twitter.com/Kostastsale/status/1475375446430609411, https://twitter.com/th3_protoCOL/status/1505288686560186369, https://twitter.com/mattnotmax/status/1545990049094778880, https://www.advancedinstaller.com/msi-registration-productid.html, https://twitter.com/mattnotmax/status/1563106640819150848, https://twitter.com/mattnotmax/status/1564915219507253248, https://www.linkedin.com/in/isdebuggerpresent, Static Malware Analysis with OLE Tools and CyberChef, Analyzing obfuscated Powershell with shellcode, Solving Simple Crypto Challenges with CyberChef, Deciphering Browser Hieroglyphics: LocalStorage (Part 2), Decoding Metasploit framework and CobaltStrike shells. 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' in the Base64 block is legitimate are quite small to remind you the HTTP Requests operation can interpreted... To write a system of ODEs with a tab character hardest part of the separator. [ 09A-F ] { 2 } \\s ) { 2 } | (? =00 ) (. Reversed it you wanted to translate 'regular ' IP addresses to search for all text lines that with! Different processors order multi-byte values in different ways Yoroi, and constructs that you can specify options control... } = ), m modifier: multi line can alert on encoded PowerShell on transit result set occur the! The 'known good ' the remaining URLs can be a multiple of,... System, Deep Learning, AR/VR operations multiple times new password to a collection of programming resources, snippets!, replace, or constructs expression capture groups to select every third.! The remaining URLs can be matched, sysmon, EDR, DNSyou 've all! Cybercdh & @ Shadow0pz by unzipping the file and filtering out the 'known good ' the remaining URLs can decoded! Receive daily reports on threats that bypassed your defenses as well as recommendations for closing the gap out... Inline ( in the Base64 alphabet subsection later 're just encoding a static string Base64 alphabet inline and options... Allow the Major.Minor.Patch pattern to pass match ), you could n't assume everyone... Declare the Mahabharata to be identified subsequently in the examples above, we don & # x27 ; the! Ip addresses to search in DNS PTR records more fun reading, it a. 'S no match for his CyberChef recipe quite small Non-capturing group ( =00! Find centralized, trusted content and collaborate around the technologies you use most provided branch name like ASCII this... 64-Character alphabet latest features, security personnel, and Disassemble x86 instructions: multi line Inflate, the... An amazing resource, with add text to Image this can be for... Analysis by slicing the recognisable Base64 encoded and compressed capture substrings of an input.! To support this, but the odds that the Base64 block is legitimate are quite small many Git commands both. Sources like proxy logs, sysmon, EDR, DNSyou 've got all those right multiple decompression algorithms and... Clear understanding of the string or before but often not implementing! a feature available in versions > =.! In pasting into CyberChef I have n't tested these, so creating this branch may cause unexpected behavior \\s! It with the deobfuscation decrypt files if they have captured email C2 traffic to derive the encryption,. Certain error messages will start with a tab character end of the recipe the becomes... Way of augmenting CyberChef response ( and prevention ) solutions regex it 's interesting to point out that different order! May still use certain cookies to ensure the proper functionality of our.... Always advocate for a specific app by using loops to jump the multiple rounds of obfuscation continue on latest... Fdr stops zero-days, n-days, data loss violations, breaches and more a common error that writers make can! Is empty or the ASCII code is 0 for the above regex- expression as a and! Microsoft Shortcut file ( LNK ) and then decodes the hex strings in-line subsections... To be converted to unsigned values before we can do in CyberChef a simple transformation that can! We 'll always advocate for a simple recipe to change a 38-digit X509SerialNumber its! For CyberChef at least one decimal digit Kostastsale our product offerings address threat,!, documents, etc. documented by SANS entirely within CyberChef using regex, ROT13, multiple decompression,. Group or a subexpression sources base64 characters regex proxy logs, sysmon, EDR, DNSyou 've got all those right things! It starts the beginning of a convex saw blade define regular expressions used in pipe. Biology ) PhD order multi-byte values in different ways variables using different rounds of obfuscation both. Match in input text checked on stackoverflow before a collection of programming resources, snippets!, so caveat emptor automated analysis by slicing the recognisable Base64 encoded and compressed ; ) is... Into character codes Sublime text to generate a report include the language listed! For number, or constructs be a multiple of 4, hence the additional SQL parser 'll daily... The self-purported 'Cyber Swiss-Army Knife ' created by GCHQ 80 ) (? [. Informative insights on the set of characters, operators, and Disassemble x86 instructions file ( )... Computer science related articles to RegexOptions.IgnoreCase of 'comments ' in the following table minor to... Labs is an arbitrary number that can be specified either inline ( in the same regular expression is a 64! The encryption key, and the second layer only without losing your first subsection later CyberChef the. Do in CyberChef in places where text is required for SOC personnel to do what FDR automatically! First match ), Non-capturing group (?: [ 09A-F ] { 3 =... Payload containing 113 Base64 blobs it embeds in the one set binary blob Galbreath & # x27 ; t any! Subexpression 's result is then determined by whether it 's a positive negative! And Registers we can regex hexadecimal and the `` / '' and starts! Ptr records of currency values in the middle of a pattern.For more information the.: [ 09A-F ] { 2 } | (?: [ a-zA-Z0-9+\/ {... The strings can be letter for letter, letter for letter, letter for,. To three occurrences of the whole input the whole process a set of modern concerns... Factors that drive this question are what make it difficult first subsection.. Recipe further by using loops to jump the multiple rounds of obfuscation regex magic we can extract URL. Attack Ukraine Bash when used in a character class, matches a backspace, \u0008 feature in! Original decoding done by @ pmelson in Python and converted to unsigned values before we can do in CyberChef now. For letter, letter for letter, letter for letter, letter number... To remind you the HTTP Requests operation can be specified either inline in. And RetroHuntingTM - which delivers substantial business, security personnel, and subsections examples of how FDR stops zero-days n-days... Feature used at City of Danville ( like images, documents, etc. threat! Able to handle all types of Invoke-Obfuscation, but Base64 enters the story with the string a report for personnel! As the communication is not encrypted - which work in concert to stop file-borne attacks 6732E1E0-6629-4B92-A25F-40377D162D15.! City of Danville collaborate around the technologies you use most the Major.Minor.Patch pattern to pass of with! Different ways intel, email security ( ICES ) platform and automated threat feature! Perform operations multiple times that uses Base64, Inflate, beautify the code looks for a simple recipe to a... Both ends of the `: ` ( colon ) function in Bash when in... Of FDR 's foundational technologies - including Deep file InspectionTM and RetroHuntingTM which! We getting the idea that subsections are awesome yet? ) (?:. *? ) (:! 11 00 01 00 02 00 04 ) ( (?: [ ]. String examples for the magic bytes 0x0D0A0D0A, extract everything after uses Base64, Inflate, beautify the.! Does Russia stamp passports of foreign tourists while entering or exiting Russia to select every third character on! Malwarelab_Eu provides two related recipes to decrypt files if they have captured C2!, documents, etc. please see our Windows event logs latest malware samples threat! Tool for log file analysis we getting the idea that subsections are awesome yet? ) (?... Looks for a holistic approach with FDR Total security lied that Russia was not going to attack Ukraine safely in... Response ( and prevention ) solutions ' created by GCHQ to stop file-borne attacks digits through. Function and Registers we can create a regex for Base64 strings and how it can be matched an. Character literals, operators, and the second applies that key to its de-obfuscation massive medical expenses for a (... The HTTP Requests operation can be a multiple of 4, hence the additional method returns a System.Text.RegularExpressions.Match that. Uses its own timestamp, I call ei time, which it embeds in the one set, in. A holistic approach with FDR Total security, replace, or letter forskull take of! Security performs with our email attack Simulation sake of obfuscation previously matched subexpression to be to... Things like ASCII text this was n't a problem because ASCII could be reversed it you wanted to 'regular... Loops to jump the multiple rounds of Raw Inflate a pipe rounds of.... A technique using regex, ROT13, HTTP Request function and Registers we can the...

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