SUSP_RTF_Header_Anomaly

Description

Detects malformed RTF header often used to trick mechanisms that check for a full RTF header

Query · yara

condition:
      uint32(0) == 0x74725c7b and  /* {\rt */
      not uint8(4) == 0x66  /* not f */
Raw source SUSP_RTF_Header_Anomaly · YARA
Esc
Published by Neo23x0/signature-base ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
rule SUSP_RTF_Header_Anomaly {
   meta:
      description = "Detects malformed RTF header often used to trick mechanisms that check for a full RTF header"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/ItsReallyNick/status/975705759618158593"
      date = "2019-01-20"
      modified = "2022-09-15"
      score = 50
      id = "fb362640-9a45-5ee5-8749-3980e0549932"
   condition:
      uint32(0) == 0x74725c7b and  /* {\rt */
      not uint8(4) == 0x66  /* not f */
}

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