Office_Document_with_VBA_Project

YARA detection rule by InQuest Labs · GPL-2.0

This signature detects an office document with an embedded VBA project. While this is fairly common it is sometimes used for malicious intent.

rule Office_Document_with_VBA_Project {
  meta:
    author         = "InQuest Labs"
    description    = "This signature detects an office document with an embedded VBA project. While this is fairly common it is sometimes used for malicious intent."
    created_date   = "2022-03-15"
    updated_date   = "2022-03-15"
    blog_reference = "http://msdn.microsoft.com/en-us/library/office/aa201751%28v=office.10%29.aspx"
    labs_reference = "https://labs.inquest.net/dfi/sha256/8a89a5c5dc79d4f8b8dd5007746ae36a3b005d84123b6bbc7c38637f43705023"
    labs_pivot     = "N/A"
    samples        = "8a89a5c5dc79d4f8b8dd5007746ae36a3b005d84123b6bbc7c38637f43705023"

  strings:
    $magic1       = /^\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1\x00\x00\x00/
    $magic2       = /^\x50\x4B\x03\x04\x14\x00\x06\x00/
    $vba_project1 = "VBA_PROJECT" wide nocase
    $vba_project2 = "word/vbaProject.binPK"

  condition:
    (($magic1 at 0) or ($magic2 at 0)) and any of ($vba_project*)

}

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

99b08fed-9e0d-48c5-a756-2574ac1cc917

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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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