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Windows_API_Function.yar problems #3

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ruppde opened this issue Oct 8, 2023 · 0 comments
Open

Windows_API_Function.yar problems #3

ruppde opened this issue Oct 8, 2023 · 0 comments

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@ruppde
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ruppde commented Oct 8, 2023

hello,

Windows_API_Function.yar leaves me totally confused:

  1. it doesn't match on the referenced f9b62b2aee5937e4d7f33f04f52ad5b05c4a1ccde6553e18909d2dc0cb595209
  2. On VT it matched on bf8867ed4a4ac03112021e96ac8429db94db381da49cb37096ea3dadb5ef2c21 (and 24M other files), but shouldn't because the file is MZ ?
  3. It correctly doesn't match on my local system:
yara Windows_API_Function.yar bf8867ed4a4ac03112021e96ac8429db94db381da49cb37096ea3dadb5ef2c21
  1. Even if it worked properly, I guess it would produce lots of false positives because of the common strings ReadFile and WriteFile
  2. Dupplicate strings in rule:
    WriteFile
    ReadFile
    IsBadReadPtr
    SetFilePointer

regards
arnim
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@ruppde