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YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_Win_MATRYOSHKA_1

matryoshka_process_hollow.rs

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X (with warnings)
Author
FireEye
Date
2020-12-02
Modified
2020-12-09
Score / Quality
75 / 75

What this rule detects

matryoshka_process_hollow.rs

Targets: Windows PE.

It defines 8 patterns (8 text, 0 hex, 0 regex).

YARA-X says: warning[duplicate_pattern_value]: duplicate pattern value

Summary generated from the rule's metadata and condition.

Rule source

apt-loader-win-matryoshka-1.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Loader_Win_MATRYOSHKA_1 : FILE
{
	meta:
		description = "matryoshka_process_hollow.rs"
		author = "FireEye"
		id = "c07fb67e-ded5-593d-b5dc-d0e2c3b5a352"
		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_Win_MATRYOSHKA_1.yar#L4-L24"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "44887551a47ae272d7873a354d24042d"
		logic_hash = "8f762684ffd3984630bf41ededa78b8993b53b22591a59912cabfe635775de53"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$s1 = "ZwQueryInformationProcess" fullword
		$s2 = "WriteProcessMemory" fullword
		$s3 = "CreateProcessW" fullword
		$s4 = "WriteProcessMemory" fullword
		$s5 = "\x00Invalid NT Signature!\x00"
		$s6 = "\x00Error while creating and mapping section. NTStatus: "
		$s7 = "\x00Error no process information - NTSTATUS:"
		$s8 = "\x00Error while erasing pe header. NTStatus: "

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

Strings (8 patterns)

IdentifierTypeValueModifiers
$s1text"ZwQueryInformationProcess"fullword
$s2text"WriteProcessMemory"fullword
$s3text"CreateProcessW"fullword
$s4text"WriteProcessMemory"fullword
$s5text"\x00Invalid NT Signature!\x00"
$s6text"\x00Error while creating and mapping section. NTStatus: "
$s7text"\x00Error no process information - NTSTATUS:"
$s8text"\x00Error while erasing pe header. NTStatus: "

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

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 44887551a47ae272d7873a354d24042d

Licence & attribution

Author: FireEye

Source repository: Mandiant red team tool countermeasures @ 3561b71724

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright (c) 2023, MANDIANT

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: c07fb67e-ded5-593d-b5dc-d0e2c3b5a352

Metadata

rev1

Tags:FILE