YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_Win_PGF_2

PE rich header matches PGF backdoor

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

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

What this rule detects

PE rich header matches PGF backdoor

Targets: Windows PE.

It defines 4 patterns (0 text, 4 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-loader-win-pgf-2.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Loader_Win_PGF_2 : FILE
{
	meta:
		description = "PE rich header matches PGF backdoor"
		author = "FireEye"
		id = "595c9e2a-3d9d-5366-9449-de1bcf333f78"
		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/PGF/production/yara/APT_Loader_Win_PGF_2.yar#L4-L21"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "226b1ac427eb5a4dc2a00cc72c163214"
		hash = "2398ed2d5b830d226af26dedaf30f64a"
		hash = "24a7c99da9eef1c58f09cf09b9744d7b"
		hash = "aeb0e1d0e71ce2a08db9b1e5fb98e0aa"
		logic_hash = "b8c024c6b4c3ce9915700b62da8a1f12440215b46f3a56078707f5257e575811"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 4

	strings:
		$rich1 = { A8 B7 17 3A EC D6 79 69 EC D6 79 69 EC D6 79 69 2F D9 24 69 E8 D6 79 69 E5 AE EC 69 EA D6 79 69 EC D6 78 69 A8 D6 79 69 E5 AE EA 69 EF D6 79 69 E5 AE FA 69 D0 D6 79 69 E5 AE EB 69 ED D6 79 69 E5 AE FD 69 E2 D6 79 69 CB 10 07 69 ED D6 79 69 E5 AE E8 69 ED D6 79 69 }
		$rich2 = { C1 CF 75 A4 85 AE 1B F7 85 AE 1B F7 85 AE 1B F7 8C D6 88 F7 83 AE 1B F7 0D C9 1A F6 87 AE 1B F7 0D C9 1E F6 8F AE 1B F7 0D C9 1F F6 8F AE 1B F7 0D C9 18 F6 84 AE 1B F7 DE C6 1A F6 86 AE 1B F7 85 AE 1A F7 BF AE 1B F7 84 C3 12 F6 81 AE 1B F7 84 C3 E4 F7 84 AE 1B F7 84 C3 19 F6 84 AE 1B F7 }
		$rich3 = { D6 60 82 B8 92 01 EC EB 92 01 EC EB 92 01 EC EB 9B 79 7F EB 94 01 EC EB 1A 66 ED EA 90 01 EC EB 1A 66 E9 EA 98 01 EC EB 1A 66 E8 EA 9A 01 EC EB 1A 66 EF EA 90 01 EC EB C9 69 ED EA 91 01 EC EB 92 01 ED EB AF 01 EC EB 93 6C E5 EA 96 01 EC EB 93 6C 13 EB 93 01 EC EB 93 6C EE EA 93 01 EC EB }
		$rich4 = { 41 36 64 33 05 57 0A 60 05 57 0A 60 05 57 0A 60 73 CA 71 60 01 57 0A 60 0C 2F 9F 60 04 57 0A 60 0C 2F 89 60 3D 57 0A 60 0C 2F 8E 60 0A 57 0A 60 05 57 0B 60 4A 57 0A 60 0C 2F 99 60 06 57 0A 60 73 CA 67 60 04 57 0A 60 0C 2F 98 60 04 57 0A 60 0C 2F 80 60 04 57 0A 60 22 91 74 60 04 57 0A 60 0C 2F 9B 60 04 57 0A 60 }

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and filesize < 15MB and ( ( $rich1 at 128 ) or ( $rich2 at 128 ) or ( $rich3 at 128 ) or ( $rich4 at 128 ) )
}

Strings (4 patterns)

Identifier	Type	Value
$rich1	hex	{ A8 B7 17 3A EC D6 79 69 EC D6 79 69 EC D6 79 69 2F D9 24 69 E8 D6 79 69 E5 AE EC 69 EA D6 79 69 EC D6 78 69 A8 D6 79 69 E5 AE EA 69 EF D6 79 69 E5 AE FA 69 D0 …
$rich2	hex	{ C1 CF 75 A4 85 AE 1B F7 85 AE 1B F7 85 AE 1B F7 8C D6 88 F7 83 AE 1B F7 0D C9 1A F6 87 AE 1B F7 0D C9 1E F6 8F AE 1B F7 0D C9 1F F6 8F AE 1B F7 0D C9 18 F6 84 …
$rich3	hex	{ D6 60 82 B8 92 01 EC EB 92 01 EC EB 92 01 EC EB 9B 79 7F EB 94 01 EC EB 1A 66 ED EA 90 01 EC EB 1A 66 E9 EA 98 01 EC EB 1A 66 E8 EA 9A 01 EC EB 1A 66 EF EA 90 …
$rich4	hex	{ 41 36 64 33 05 57 0A 60 05 57 0A 60 05 57 0A 60 73 CA 71 60 01 57 0A 60 0C 2F 9F 60 04 57 0A 60 0C 2F 89 60 3D 57 0A 60 0C 2F 8E 60 0A 57 0A 60 05 57 0B 60 4A …

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and filesize < 15MB and ( ( $rich1 at 128 ) or ( $rich2 at 128 ) or ( $rich3 at 128 ) or ( $rich4 at 128 ) )

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
The file must be smaller than 15MB (a cheap guard that skips large files).
Pattern $rich1 must be found at offset 128.
Pattern $rich2 must be found at offset 128.
Pattern $rich3 must be found at offset 128.
Pattern $rich4 must be found at offset 128.

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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).

226b1ac427eb5a4dc2a00cc72c163214
2398ed2d5b830d226af26dedaf30f64a
24a7c99da9eef1c58f09cf09b9744d7b
aeb0e1d0e71ce2a08db9b1e5fb98e0aa

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: 595c9e2a-3d9d-5366-9449-de1bcf333f78

Metadata

rev	4

Tags:FILE

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