YARA · Mandiant red team tool countermeasures

FIREEYE_RT_Credtheft_MSIL_Credsnatcher_1

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 'CredSnatcher' project.

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

Author: FireEye
Date: 2020-12-08
Modified: 2020-12-09
Score / Quality: 75 / 73

What this rule detects

Targets: Windows PE.

It defines 1 patterns (1 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

credtheft-msil-credsnatcher-1.yarBSD 2-Clause License

rule FIREEYE_RT_Credtheft_MSIL_Credsnatcher_1 : 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 'CredSnatcher' project."
		author = "FireEye"
		id = "0d8f7495-4748-577d-8ef2-ccc4829fc165"
		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/UNCATEGORIZED/production/yara/CredTheft_MSIL_CredSnatcher_1.yar#L4-L15"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "dd8805d0e470e59b829d98397507d8c2"
		logic_hash = "2c86be1bcf29bcb2c167f9248dee0ab4a5a5c6740fb1f18784ee2e380176df91"
		score = 75
		quality = 73
		tags = "FILE"
		rev = 1

	strings:
		$typelibguid0 = "370b4d21-09d0-433f-b7e4-4ebdd79948ec" ascii nocase wide

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

Strings (1 patterns)

Identifier	Type	Value	Modifiers
$typelibguid0	text	"370b4d21-09d0-433f-b7e4-4ebdd79948ec"	ascii nocase 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

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).

dd8805d0e470e59b829d98397507d8c2

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: 0d8f7495-4748-577d-8ef2-ccc4829fc165

Metadata

rev	1

Tags:FILE

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