SUSP_RTF_Header_Anomaly_RID2F7F

YARA detection rule by Florian Roth · CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/

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

rule SUSP_RTF_Header_Anomaly_RID2F7F : ANOMALY DEMO FILE SUSP {
   meta:
      description = "Detects malformed RTF header often used to trick mechanisms that check for a full RTF header"
      author = "Florian Roth"
      reference = "https://twitter.com/ItsReallyNick/status/975705759618158593"
      date = "2019-01-20 11:59:41"
      score = 55
      customer = "demo"
      license = "CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/"
      modified = "2022-09-15"
      tags = "ANOMALY, DEMO, FILE, SUSP"
      minimum_yara = "3.5.0"
      
   condition: 
      uint32 ( 0 ) == 0x74725c7b and not uint8 ( 4 ) == 0x66
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

833bc1b4-9e99-4ea0-aae3-5649c2b8c364

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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