mandiant/capa-rules

rule idea: zlib fast inflate

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#494 opened on 2021年11月4日

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good first issuerule idea

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説明

see source: https://github.com/madler/zlib/blob/master/contrib/masmx86/inffas32.asm

I've seen this code used in shellcode; we can hit on the hard-coded strings or the assembly itself.

strings:

  • Fast decoding Code from Chris Anderson
  • invalid literal/length code
  • invalid distance code
  • invalid distance too far back

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