YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_Win32_PGF_1

base dlls: /lib/payload/techniques/unmanaged_exports/

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

Author: FireEye
Date: 2020-11-25
Modified: 2020-12-09
Score / Quality: 75 / 75

What this rule detects

base dlls: /lib/payload/techniques/unmanaged_exports/

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-loader-win32-pgf-1.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Loader_Win32_PGF_1 : FILE
{
	meta:
		description = "base dlls: /lib/payload/techniques/unmanaged_exports/"
		author = "FireEye"
		id = "1af4f2ce-c540-5836-a749-43a0b08609b1"
		date = "2020-11-25"
		date = "2020-11-25"
		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_Win32_PGF_1.yar#L4-L19"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "383161e4deaf7eb2ebeda2c5e9c3204c"
		logic_hash = "d3fb0bd7b678b19ee2e0e846f4e13e4ce7e2629ecda123f34ef52f2af42d2a8e"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 6A ?? FF 15 [4-32] 8A ?? 04 [0-32] 8B ?? 89 ?? 8B [2] 89 [2] 8B [2] 89 ?? 08 8B [2] 89 [2] 8B [2] 89 [2-64] 8B [5] 83 ?? 01 89 [5] 83 [5-32] 0F B6 [1-2] 0F B6 [1-2] 33 [1-16] 88 ?? EB }
		$sb2 = { 6A 40 [0-32] 68 00 30 00 00 [0-32] 6A 00 [0-16] FF 15 [4-32] 89 45 [4-64] E8 [4-32] 83 ?? 01 [4-80] 0F B6 [1-64] 33 [1-32] 88 [2-64] FF ( D? | 55 ) }
		$sb3 = { 8B ?? 08 03 ?? 3C [2-32] 0F B? ?? 14 [0-32] 8D [2] 18 [2-64] 0F B? ?? 06 [3-64] 6B ?? 28 }

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them
}

Strings (3 patterns)

Identifier	Type	Value
$sb1	hex	{ 6A ?? FF 15 [4-32] 8A ?? 04 [0-32] 8B ?? 89 ?? 8B [2] 89 [2] 8B [2] 89 ?? 08 8B [2] 89 [2] 8B [2] 89 [2-64] 8B [5] 83 ?? 01 89 [5] 83 [5-32] 0F B6 [1-2] 0F B6 …
$sb2	hex	{ 6A 40 [0-32] 68 00 30 00 00 [0-32] 6A 00 [0-16] FF 15 [4-32] 89 45 [4-64] E8 [4-32] 83 ?? 01 [4-80] 0F B6 [1-64] 33 [1-32] 88 [2-64] FF ( D? \| 55 ) }
$sb3	hex	{ 8B ?? 08 03 ?? 3C [2-32] 0F B? ?? 14 [0-32] 8D [2] 18 [2-64] 0F B? ?? 06 [3-64] 6B ?? 28 }

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) 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).

383161e4deaf7eb2ebeda2c5e9c3204c

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: 1af4f2ce-c540-5836-a749-43a0b08609b1

Metadata

rev	1

Tags:FILE

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