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GCTI_Cobaltstrike_Resources_Beacon_Dll_V1_46

Cobalt Strike's resources/beacon.dll Version 1.46

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 1.46

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-v1-46.yarApache License 2.0
rule GCTI_Cobaltstrike_Resources_Beacon_Dll_V1_46
{
	meta:
		description = "Cobalt Strike's resources/beacon.dll Version 1.46"
		author = "gssincla@google.com"
		id = "79715042-1963-5e48-8b64-7d915da58d84"
		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#L86-L115"
		license_url = "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/LICENSE"
		hash = "44e34f4024878024d4804246f57a2b819020c88ba7de160415be38cd6b5e2f76"
		logic_hash = "1a5c63c8b5527c0442830a73ded8458cf82a9d8ecb9b31e9a02c10b27ed6195e"
		score = 75
		quality = 85
		tags = ""

	strings:
		$version_sig = { 8B F2 83 F9 0C 0F 87 8E 00 00 00 FF 24 }
		$decode = { B1 ?? 30 88 [4] 40 3D A8 01 00 00 7C F2 }

	condition:
		all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$version_sighex{ 8B F2 83 F9 0C 0F 87 8E 00 00 00 FF 24 }
$decodehex{ B1 ?? 30 88 [4] 40 3D A8 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).

  • 44e34f4024878024d4804246f57a2b819020c88ba7de160415be38cd6b5e2f76

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: 79715042-1963-5e48-8b64-7d915da58d84

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