YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Dropper_Win64_MATRYOSHKA_1

matryoshka_dropper.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_dropper.rs

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

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

rule FIREEYE_RT_APT_Dropper_Win64_MATRYOSHKA_1 : FILE
{
	meta:
		description = "matryoshka_dropper.rs"
		author = "FireEye"
		id = "1406aafd-6217-51ef-b3af-107ee88f9c99"
		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_Dropper_Win64_MATRYOSHKA_1.yar#L4-L18"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "edcd58ba5b1b87705e95089002312281"
		logic_hash = "23f811f8e9387ca6a1257a31af66de9739733e4728adba0a3e3f74b5e5c0a556"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 8D 8D [4] E8 [4] 49 89 D0 C6 [2-6] 01 C6 [2-6] 01 [0-8] C7 44 24 ?? 0E 00 00 00 4C 8D 0D [4] 48 8D 8D [4] 48 89 C2 E8 [4] C6 [2-6] 01 C6 [2-6] 01 48 89 E9 48 8D 95 [4] E8 [4] 83 [2] 01 0F 8? [4] 48 01 F3 48 29 F7 48 [2] 08 48 89 85 [4] C6 [2-6] 01 C6 [2-6] 01 C6 [2-6] 01 48 8D 8D [4] 48 89 DA 49 89 F8 E8 }
		$sb2 = { 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 C7 45 ?? 68 00 00 00 48 8B [2] 48 8D [2] 48 89 [3] 48 89 [3] 0F 11 44 24 ?? C7 44 24 ?? 08 00 00 0C C7 44 24 ?? 00 00 00 00 31 ?? 48 89 ?? 31 ?? 45 31 ?? 45 31 ?? E8 [4] 83 F8 01 }

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

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$sb1	hex	{ 8D 8D [4] E8 [4] 49 89 D0 C6 [2-6] 01 C6 [2-6] 01 [0-8] C7 44 24 ?? 0E 00 00 00 4C 8D 0D [4] 48 8D 8D [4] 48 89 C2 E8 [4] C6 [2-6] 01 C6 [2-6] 01 48 89 E9 48 …
$sb2	hex	{ 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 C7 45 ?? 68 00 00 00 48 8B …

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).

edcd58ba5b1b87705e95089002312281

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: 1406aafd-6217-51ef-b3af-107ee88f9c99

Metadata

rev	1

Tags:FILE

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