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YARA · Mandiant red team tool countermeasures

FIREEYE_RT_Trojan_MSIL_GORAT_Plugin_DOTNET_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 'RedFlare - Plugin - .NET' project.

MalwareMandiant 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

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 'RedFlare - Plugin - .NET' project.

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
trojan-msil-gorat-plugin-dotnet-1.yarBSD 2-Clause License
rule FIREEYE_RT_Trojan_MSIL_GORAT_Plugin_DOTNET_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 'RedFlare - Plugin - .NET' project."
		author = "FireEye"
		id = "faa73d64-4bb1-5c06-a3a5-1f1aa99ea932"
		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/REDFLARE (Gorat)/production/yara/Trojan_MSIL_GORAT_Plugin_DOTNET_1.yar#L4-L16"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "dd8805d0e470e59b829d98397507d8c2"
		logic_hash = "e979822273c6d1ccdfebd341c9e2cb1040fe34a04e8b41c024885063fd946ad5"
		score = 75
		quality = 71
		tags = "FILE"
		rev = 1

	strings:
		$typelibguid0 = "cd9407d0-fc8d-41ed-832d-da94daa3e064" ascii nocase wide
		$typelibguid1 = "fc3daedf-1d01-4490-8032-b978079d8c2d" ascii nocase wide

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

Strings (2 patterns)

IdentifierTypeValueModifiers
$typelibguid0text"cd9407d0-fc8d-41ed-832d-da94daa3e064"ascii nocase wide
$typelibguid1text"fc3daedf-1d01-4490-8032-b978079d8c2d"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

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)

Copyright notice: Copyright (c) 2023, MANDIANT

Original rule

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

Rule id: faa73d64-4bb1-5c06-a3a5-1f1aa99ea932

Metadata

rev1

Tags:FILE

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