YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_Win64_MATRYOSHKA_2

matryoshka.rs

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

Author: FireEye
Date: 2020-12-02
Modified: 2020-12-09
Score / Quality: 75 / 75

What this rule detects

matryoshka.rs

Targets: Windows PE.

It defines 4 patterns (2 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-loader-win64-matryoshka-2.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Loader_Win64_MATRYOSHKA_2 : FILE
{
	meta:
		description = "matryoshka.rs"
		author = "FireEye"
		id = "25f916bc-6ee1-5175-903c-4266b0a086e1"
		date = "2020-12-02"
		date = "2020-12-02"
		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/MATRYOSHKA/production/yara/APT_Loader_Win64_MATRYOSHKA_2.yar#L4-L20"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "7f8102b789303b7861a03290c79feba0"
		logic_hash = "daa6f6d526bf959c268b2c5a4cae33307cfec5e9ca51283131bbfa66a582b505"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 4D [2] 00 49 [2] 08 B? 02 00 00 00 31 ?? E8 [4] 48 89 ?? 48 89 ?? 4C 89 ?? 49 89 ?? E8 [4] 4C 89 ?? 48 89 ?? E8 [4] 83 [2] 01 0F 84 [4] 48 89 ?? 48 8B [2] 48 8B [2] 48 89 [5] 48 89 [5] 48 89 [5] 41 B? [4] 4C 89 ?? 31 ?? E8 [4] C7 45 [5] 48 89 ?? 4C 89 ?? E8 [4] 85 C0 }
		$sb2 = { 4C [2] 0F 83 [4] 41 0F [3] 01 41 32 [2] 00 48 8B [5] 48 3B [5] 75 ?? 41 B? 01 00 00 00 4C 89 ?? E8 [4] E9 }
		$si1 = "CreateToolhelp32Snapshot" fullword
		$si2 = "Process32Next" fullword

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x020B ) and all of them
}

Strings (4 patterns)

Identifier	Type	Value	Modifiers
$sb1	hex	{ 4D [2] 00 49 [2] 08 B? 02 00 00 00 31 ?? E8 [4] 48 89 ?? 48 89 ?? 4C 89 ?? 49 89 ?? E8 [4] 4C 89 ?? 48 89 ?? E8 [4] 83 [2] 01 0F 84 [4] 48 89 ?? 48 8B [2] 48 …
$sb2	hex	{ 4C [2] 0F 83 [4] 41 0F [3] 01 41 32 [2] 00 48 8B [5] 48 3B [5] 75 ?? 41 B? 01 00 00 00 4C 89 ?? E8 [4] E9 }
$si1	text	"CreateToolhelp32Snapshot"	fullword
$si2	text	"Process32Next"	fullword

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x020B ) 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).

7f8102b789303b7861a03290c79feba0

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: 25f916bc-6ee1-5175-903c-4266b0a086e1

Metadata

rev	1

Tags:FILE

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