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URL_File_Local_EXE

YARA detection rule by Florian Roth (Nextron Systems) · Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE

Detects an .url file that points to a local executable

rule URL_File_Local_EXE {
   meta:
      description = "Detects an .url file that points to a local executable"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://twitter.com/malwareforme/status/915300883012870144"
      date = "2017-10-04"
      score = 60
      id = "8b157e98-7b69-5649-b1d8-40bd6b685bf6"
   strings:
      $s1 = "[InternetShortcut]" ascii wide fullword
      $s2 = /URL=file:\/\/\/C:\\[^\n]{1,50}\.exe/
   condition:
      filesize < 400 and all of them
}

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

558e7e31-7302-4413-ab5e-b8dcfc216d46

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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

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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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