CobaltStrike_Resources_Artifact32_v3_1_and_v3_2

YARA detection rule by gssincla@google.com · Apache-2.0

Cobalt Strike's resources/artifact32{.dll,.exe,svc.exe,big.exe,big.dll,bigsvc.exe} and resources/artifact32uac(alt).dll signature for versions 3.1 and 3.2

rule CobaltStrike_Resources_Artifact32_v3_1_and_v3_2
{
	meta:
		description = "Cobalt Strike's resources/artifact32{.dll,.exe,svc.exe,big.exe,big.dll,bigsvc.exe} and resources/artifact32uac(alt).dll signature for versions 3.1 and 3.2"
		hash =  "4f14bcd7803a8e22e81e74d6061d0df9e8bac7f96f1213d062a29a8523ae4624"
		author = "gssincla@google.com"
		reference = "https://cloud.google.com/blog/products/identity-security/making-cobalt-strike-harder-for-threat-actors-to-abuse"
		date = "2022-11-18"
		
	strings:
	

	$decoderFunc = { 89 ?? B? 04 00 00 00 99 F7 FF 8B [2] 8A [2] 30 ?? 8A ?? 4? 88 }
	condition:
		all of them
}

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

dede7bde-133c-46bf-8c8b-0536d510861c

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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 ]]

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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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