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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_NET_GUID_Kittylitter

Detects .NET red/black-team tools via typelibguid

Hack toolSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Arnim Rupp (https://github.com/ruppde)
Date
2023-03-22
Modified
2025-08-15
Score / Quality
75 / 85

What this rule detects

Detects .NET red/black-team tools via typelibguid

Targets: Windows PE.

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hktl-net-guid-kittylitter.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_NET_GUID_Kittylitter : FILE
{
	meta:
		description = "Detects .NET red/black-team tools via typelibguid"
		author = "Arnim Rupp (https://github.com/ruppde)"
		id = "f457b91f-4adb-5be6-b9c2-f6cc39d4bdaf"
		date = "2023-03-22"
		modified = "2025-08-15"
		reference = "https://github.com/djhohnstein/KittyLitter"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_github_net_redteam_tools_guids.yar#L4742-L4757"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "e0cfb39be4d51d2a929712e4f82851b9cafb46643e1403cd4ea8414624a0a2b6"
		score = 75
		quality = 85
		tags = "FILE"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"

	strings:
		$typelibguid0lo = "449cf269-4798-4268-9a0d-9a17a08869ba" ascii wide
		$typelibguid1lo = "e7a509a4-2d44-4e10-95bf-b86cb7767c2c" ascii wide
		$typelibguid2lo = "b2b8dd4f-eba6-42a1-a53d-9a00fe785d66" ascii wide

	condition:
		( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and any of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$typelibguid0lotext"449cf269-4798-4268-9a0d-9a17a08869ba"ascii wide
$typelibguid1lotext"e7a509a4-2d44-4e10-95bf-b86cb7767c2c"ascii wide
$typelibguid2lotext"b2b8dd4f-eba6-42a1-a53d-9a00fe785d66"ascii wide

Condition

( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and any of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least one pattern in the rule must match.

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References

Licence & attribution

Author: Arnim Rupp (https://github.com/ruppde)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (stated in the rule's own meta)

“Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE”

Original rule

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

Rule id: f457b91f-4adb-5be6-b9c2-f6cc39d4bdaf

Tags:FILE

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