YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Builder_Win64_MATRYOSHKA_1

matryoshka_pe_to_shellcode.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_pe_to_shellcode.rs

Targets: Windows PE.

It defines 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-builder-win64-matryoshka-1.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Builder_Win64_MATRYOSHKA_1 : FILE
{
	meta:
		description = "matryoshka_pe_to_shellcode.rs"
		author = "FireEye"
		id = "0afcf13e-5cd3-5c1c-897e-b6d0c283ab0f"
		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_Builder_Win64_MATRYOSHKA_1.yar#L4-L20"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "8d949c34def898f0f32544e43117c057"
		logic_hash = "b370d7dea44bccc92fc8dbd4ea0ee9bec523820108bf8bc67acb17ebf9835f74"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 4D 5A 45 52 [0-32] E8 [0-32] 00 00 00 00 [0-32] 5B 48 83 EB 09 53 48 81 [0-32] C3 [0-32] FF D3 [0-32] C3 }
		$ss1 = "\x00Stub Size: "
		$ss2 = "\x00Executable Size: "
		$ss3 = "\x00[+] Writing out to file"

	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
$sb1	hex	{ 4D 5A 45 52 [0-32] E8 [0-32] 00 00 00 00 [0-32] 5B 48 83 EB 09 53 48 81 [0-32] C3 [0-32] FF D3 [0-32] C3 }
$ss1	text	"\x00Stub Size: "
$ss2	text	"\x00Executable Size: "
$ss3	text	"\x00[+] Writing out to file"

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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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).

8d949c34def898f0f32544e43117c057

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: 0afcf13e-5cd3-5c1c-897e-b6d0c283ab0f

Metadata

rev	1

Tags:FILE

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