SUSP_OneNote_Embedded_FileDataStoreObject_Type_Jan23_2

YARA detection rule by Florian Roth (Nextron Systems) · NOASSERTION

Detects suspicious embedded file types in OneNote files

rule SUSP_OneNote_Embedded_FileDataStoreObject_Type_Jan23_2 {
   meta:
      description = "Detects suspicious embedded file types in OneNote files"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://blog.didierstevens.com/"
      date = "2023-01-27"
      score = 65
      id = "0664d202-ab4c-57b6-91ee-ea21ac08909e"
   strings:
      
      $a1 = { 00 e7 16 e3 bd 65 26 11 45 a4 c4 8d 4d 0b 7a 9e ac }

      $s1 = "<HTA:APPLICATION "
   condition:
      filesize < 5MB
      and $a1 
      and 1 of ($s*)
}

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

5bc8b772-aecc-4bd7-96c6-5ec09cddde82

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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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