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GCTI_Cobaltstrike_Resources_Template_Py_V3_3_To_V4_X

Cobalt Strike's resources/template.py signature for versions v3.3 to v4.x

Hack toolCobalt StrikeGoogle Cloud Threat Intelligence (GCTI)Apache License 2.0Compiles with YARA-X
Author
gssincla@google.com
Date
2022-11-18
Modified
2022-11-19
Score / Quality
75 / 85

What this rule detects

Cobalt Strike's resources/template.py signature for versions v3.3 to v4.x

Associated malware family: Cobalt Strike.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

cobaltstrike-resources-template-py-v3-3-to-v4-x.yarApache License 2.0
rule GCTI_Cobaltstrike_Resources_Template_Py_V3_3_To_V4_X
{
	meta:
		description = "Cobalt Strike's resources/template.py signature for versions v3.3 to v4.x"
		author = "gssincla@google.com"
		id = "16aef9a9-b217-5462-93dc-f6273c99ddd0"
		date = "2022-11-18"
		modified = "2022-11-19"
		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_Template_Py_v3_3_to_v4_x.yara#L17-L36"
		license_url = "https://github.com/chronicle/GCTI/blob/1c5fd42b1895098527fde00c2d9757edf6b303bb/LICENSE"
		hash = "d5cb406bee013f51d876da44378c0a89b7b3b800d018527334ea0c5793ea4006"
		logic_hash = "3c26cea4b8f2b200bf58e939ae9ead7a7339d4ec0de8c72b3d9c7da897600081"
		score = 75
		quality = 85
		tags = ""

	strings:
		$arch = "platform.architecture()"
		$nope = "WindowsPE"
		$alloc = "ctypes.windll.kernel32.VirtualAlloc"
		$movemem = "ctypes.windll.kernel32.RtlMoveMemory"
		$thread = "ctypes.windll.kernel32.CreateThread"
		$wait = "ctypes.windll.kernel32.WaitForSingleObject"

	condition:
		all of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$archtext"platform.architecture()"
$nopetext"WindowsPE"
$alloctext"ctypes.windll.kernel32.VirtualAlloc"
$movememtext"ctypes.windll.kernel32.RtlMoveMemory"
$threadtext"ctypes.windll.kernel32.CreateThread"
$waittext"ctypes.windll.kernel32.WaitForSingleObject"

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).

  • d5cb406bee013f51d876da44378c0a89b7b3b800d018527334ea0c5793ea4006

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: 16aef9a9-b217-5462-93dc-f6273c99ddd0

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