YARA · Mandiant red team tool countermeasures

FIREEYE_RT_Credtheft_MSIL_Titospecial_2

The TypeLibGUID present in a .NET binary maps directly to the ProjectGuid found in the '.csproj' file of a .NET project. This rule looks for .NET PE files that contain the ProjectGuid found in the TitoSpecial project. There are 2 GUIDs in this rule as the x86 and x64 versions of this tool use a different ProjectGuid.

GenericMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X

Author: FireEye
Date: 2020-12-08
Modified: 2020-12-09
Score / Quality: 75 / 71

What this rule detects

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

credtheft-msil-titospecial-2.yarBSD 2-Clause License

rule FIREEYE_RT_Credtheft_MSIL_Titospecial_2 : FILE
{
	meta:
		description = "The TypeLibGUID present in a .NET binary maps directly to the ProjectGuid found in the '.csproj' file of a .NET project. This rule looks for .NET PE files that contain the ProjectGuid found in the TitoSpecial project. There are 2 GUIDs in this rule as the x86 and x64 versions of this tool use a different ProjectGuid."
		author = "FireEye"
		id = "0262c720-e6b8-5bf2-a242-19a7f044973f"
		date = "2020-12-08"
		modified = "2020-12-09"
		reference = "https://github.com/mandiant/red_team_tool_countermeasures/"
		source_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/rules/TITOSPECIAL/production/yara/CredTheft_MSIL_TitoSpecial_2.yar#L4-L16"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "4bf96a7040a683bd34c618431e571e26"
		logic_hash = "2f621f8de2a4679e6cbce7f41859eaa3095ca54090c8bfccd3b767590ac91f2c"
		score = 75
		quality = 71
		tags = "FILE"
		rev = 4

	strings:
		$typelibguid1 = "C6D94B4C-B063-4DEB-A83A-397BA08515D3" ascii nocase wide
		$typelibguid2 = "3b5320cf-74c1-494e-b2c8-a94a24380e60" ascii nocase wide

	condition:
		( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( $typelibguid1 or $typelibguid2 )
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$typelibguid1	text	"C6D94B4C-B063-4DEB-A83A-397BA08515D3"	ascii nocase wide
$typelibguid2	text	"3b5320cf-74c1-494e-b2c8-a94a24380e60"	ascii nocase wide

Condition

( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( $typelibguid1 or $typelibguid2 )

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
Pattern $typelibguid1 must be present.
Pattern $typelibguid2 must be present.

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References

https://github.com/mandiant/red_team_tool_countermeasures/

Sample hashes

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

4bf96a7040a683bd34c618431e571e26

Licence & attribution

Author: FireEye

Source repository: Mandiant red team tool countermeasures @ 3561b71724

Licence: BSD 2-Clause License (repository licence)

Original rule

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

Rule id: 0262c720-e6b8-5bf2-a242-19a7f044973f

Metadata

rev	4

Tags:FILE

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