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GCTI_Cobaltstrike_Resources_Beacon_Dll_V1_44

Cobalt Strike's resources/beacon.dll Version 1.44

Hack toolCobalt StrikeGoogle Cloud Threat Intelligence (GCTI)Apache License 2.0Compiles with YARA-X
Author
gssincla@google.com
Date
2022-11-18
Modified
2023-12-04
Score / Quality
75 / 85

What this rule detects

Cobalt Strike's resources/beacon.dll Version 1.44

Associated malware family: Cobalt Strike.

It defines 2 patterns (0 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

cobaltstrike-resources-beacon-dll-v1-44.yarApache License 2.0
rule GCTI_Cobaltstrike_Resources_Beacon_Dll_V1_44
{
	meta:
		description = "Cobalt Strike's resources/beacon.dll Version 1.44"
		author = "gssincla@google.com"
		id = "935ee27f-ce1b-5491-b4a3-cb78f199ab1b"
		date = "2022-11-18"
		modified = "2023-12-04"
		reference = "https://cloud.google.com/blog/products/identity-security/making-cobalt-strike-harder-for-threat-actors-to-abuse"
		source_url = "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/YARA/CobaltStrike/CobaltStrike__Resources_Beacon_Dll_All_Versions_MemEnabled.yara#L17-L49"
		license_url = "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/LICENSE"
		hash = "75102e8041c58768477f5f982500da7e03498643b6ece86194f4b3396215f9c2"
		logic_hash = "ebed8b6dc0b929164b1aa25b491b9d2fbb61d380a8b1268df7d424afe90f613d"
		score = 75
		quality = 85
		tags = ""

	strings:
		$version_sig = { 0F B7 D2 4A 53 8B D9 83 FA 04 77 36 FF 24 }
		$decode = { B1 ?? 30 88 [4] 40 3D 28 01 00 00 7C F2 }

	condition:
		all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$version_sighex{ 0F B7 D2 4A 53 8B D9 83 FA 04 77 36 FF 24 }
$decodehex{ B1 ?? 30 88 [4] 40 3D 28 01 00 00 7C F2 }

Condition

all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 75102e8041c58768477f5f982500da7e03498643b6ece86194f4b3396215f9c2

Licence & attribution

Author: gssincla@google.com

Source repository: Google Cloud Threat Intelligence (GCTI) @ 1c5fd42b18

Licence: Apache License 2.0 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 935ee27f-ce1b-5491-b4a3-cb78f199ab1b

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