ET-3423

Indicators of Compromise (0)

No indicators of compromise on this threat.

References (1)

• Why ET rules used hex bytes instead of the original characters? Emerging Threats Community

• Hex Encoding for Text, Bytes, and Debugging | AppHelp Guide
  web:apphelp.net

  A valid hex string should have an even number of characters and only use 0-9, a-f, or A-F. If decoded text looks broken, check whether the bytes are UTF-8, binary data, or another character encoding.

  2026-08-20 23:19 UTC
• Encodings | Practical CTF
  web:book.jorianwoltjer.com

  The nice thing about hex is the fact that 2 digits can store 16x16=256 values, exactly the amount of possible bytes (2^8=256). This makes it really useful to represent bytes with, and that is what it is often used for. As we saw with ASCII, all characters can be assigned a number.

  2026-08-20 23:19 UTC
• Hexadecimal Encoding Guide: Text, Bytes & Examples | CipherRegister
  web:cipherregister.com

  Why 41 means A Using the CipherRegister Hex tool Key and rules Worked example: Meet at dawn! UTF-8 and multi- byte characters What leaks from hex ? Why hex is useful Hex vs Base64 Hex vs encryption A simple Python Hex encoder Reading the code like the encoding Common questions about hex Is hex encryption? Why does Hello become 48 65 6c 6c 6f?

  2026-08-20 23:19 UTC
• Why ET rules used hex bytes instead of the original characters?
  web:forum.suricata.io

  While studying the rules from Emerging Threats, I noticed one peculiarity. In the rules , instead of the original symbols (for example, ".") their hexadecimal byte values are used .

  2026-08-20 23:19 UTC
• Character Encoding Explained: ASCII, EBCDIC, Hex & Binary
  web:hsmkit.com

  Understand character encoding fundamentals — ASCII table, EBCDIC in banking systems, hexadecimal and binary representations, and encoding compatibility issues.

  2026-08-20 23:19 UTC
• Character Encoding Systems - GeeksforGeeks
  web:www.geeksforgeeks.org

  Character encoding is the process of converting characters (letters, numbers, symbols) into a format that computers can understand and store. Encoding ensures computers can store, process, and transmit text data accurately. Decoding reverses the process, turning binary codes back into readable text for display or use.

  2026-08-20 23:19 UTC
• Understanding Character Encoding - GeeksforGeeks
  web:www.geeksforgeeks.org

  UTF-8 will only use 1 byte when encoding an ASCII character , giving the same output as any other ASCII encoding. But for other characters , it will use the first bit to indicate that a 2nd byte will follow. UTF-16 uses 16-bit by default, but that only gives you 65k possible characters , which is nowhere near enough for the full Unicode set.

  2026-08-20 23:19 UTC
• Hex Encoding Strategy | Promptfoo
  web:www.promptfoo.dev

  The Hex Encoding strategy tests an AI system's ability to resist ASCII hex -encoded inputs that might bypass security controls. Hex encoding (using characters 0-9, A-F) exploits a potential gap in safety mechanisms by representing text as a sequence of hexadecimal bytes .

  2026-08-20 23:19 UTC
• 12 Questions and Answers About Standard Encoding (T1132.001)
  web:www.securityscientist.net

  Learn how Standard Encoding (T1132.001) works in MITRE ATT&CK — covering Base64 and hex encoding in C2 channels, threat group usage, PowerShell EncodedCommand detection, SIEM rules , and incident response triage guidance.

  2026-08-20 23:19 UTC
• The history and current development of character encoding
  web:www.sobyte.net

  It can use 1 to 4 bytes to represent a symbol, and the byte length varies depending on the symbol. UTF-8 encoding rules are simple and practical. For a single- byte symbol, the first bit of the byte is set to 0, and the next 7 bits are the unicode code of the symbol. So for English letters, UTF-8 encoding is exactly the same as ASCII encoding; 2.

  2026-08-20 23:19 UTC

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