YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_MSIL_PGF_1

base.cs

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X

Author: FireEye
Date: 2020-11-24
Modified: 2020-12-09
Score / Quality: 75 / 75

What this rule detects

base.cs

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-loader-msil-pgf-1.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Loader_MSIL_PGF_1 : FILE
{
	meta:
		description = "base.cs"
		author = "FireEye"
		id = "39d9821f-86e8-528a-a0a9-287dbe325484"
		date = "2020-11-24"
		date = "2020-11-24"
		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/PGF/production/yara/APT_Loader_MSIL_PGF_1.yar#L4-L17"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "a495c6d11ff3f525915345fb762f8047"
		logic_hash = "4174ed53336f3951d26282dc81b99b2044ac6350d4b4c0074194a9b4acecefee"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 72 [4] 6F [2] 00 0A 26 [0-16] 0? 6F [2] 00 0A [1-3] 0? 28 [2] 00 0A [0-1] 0? 72 [4-5] 0? 28 [2] 00 0A [0-1] 0? 6F [2] 00 0A 13 ?? 1? 13 ?? 38 [8-16] 91 [3-6] 8E 6? 5D 91 61 D2 9C 11 ?? 1? 58 13 [3-5] 8E 6? 3F }

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

Strings (1 patterns)

Identifier	Type	Value	Modifiers
$sb1	hex	{ 72 [4] 6F [2] 00 0A 26 [0-16] 0? 6F [2] 00 0A [1-3] 0? 28 [2] 00 0A [0-1] 0? 72 [4-5] 0? 28 [2] 00 0A [0-1] 0? 6F [2] 00 0A 13 ?? 1? 13 ?? 38 [8-16] 91 [3-6] …

Condition

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

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
All patterns 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).

a495c6d11ff3f525915345fb762f8047

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: 39d9821f-86e8-528a-a0a9-287dbe325484

Metadata

rev	1

Tags:FILE

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