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YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_MSIL_WILDCHILD_1

No description has been set in the source file - FireEye-RT

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X
Author
FireEye
Date
2020-12-01
Modified
2020-12-09
Score / Quality
75 / 75

What this rule detects

No description has been set in the source file - FireEye-RT

Targets: Windows PE.

It defines 3 patterns (2 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-loader-msil-wildchild-1.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Loader_MSIL_WILDCHILD_1 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "b9e0707e-98eb-55da-ad1d-6a84bd113747"
		date = "2020-12-01"
		date = "2020-12-01"
		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/WILDCHILD/production/yara/APT_Loader_MSIL_WILDCHILD_1.yar#L4-L18"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "6f04a93753ae3ae043203437832363c4"
		logic_hash = "a600c3d127f77dc1f99160e4a242e005970de0abd1798296b6a351b968ca1350"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$s1 = "\x00QueueUserAPC\x00"
		$s2 = "\x00WriteProcessMemory\x00"
		$sb1 = { 6F [2] 00 0A 28 [2] 00 0A 6F [2] 00 0A 13 ?? 28 [2] 00 0A 28 [2] 00 0A 13 ?? 11 ?? 11 ?? 28 [2] 00 0A [0-16] 7B [2] 00 04 1? 20 [4] 28 [2] 00 0A 11 ?? 28 [2] 00 0A 28 [2] 00 0A 7E [2] 00 0A 7E [2] 00 0A 28 [2] 00 06 [0-16] 14 7E [2] 00 0A 7E [2] 00 0A 1? 20 04 00 08 08 7E [2] 00 0A 14 12 ?? 12 ?? 28 [2] 00 06 [0-16] 7B [2] 00 04 7E [2] 00 0A [0-16] 8E ?? 7E [2] 00 04 7E [2] 00 04 28 [2] 00 06 [4-120] 28 [2] 00 06 [0-80] 6F [2] 00 0A 6F [2] 00 0A 28 [2] 00 06 13 ?? 11 ?? 11 ?? 7E [2] 00 0A 28 [2] 00 06 }

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"\x00QueueUserAPC\x00"
$s2text"\x00WriteProcessMemory\x00"
$sb1hex{ 6F [2] 00 0A 28 [2] 00 0A 6F [2] 00 0A 13 ?? 28 [2] 00 0A 28 [2] 00 0A 13 ?? 11 ?? 11 ?? 28 [2] 00 0A [0-16] 7B [2] 00 04 1? 20 [4] 28 [2] 00 0A 11 ?? 28 [2] …

Condition

( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) 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).

  • 6f04a93753ae3ae043203437832363c4

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: b9e0707e-98eb-55da-ad1d-6a84bd113747

Metadata

rev1

Tags:FILE

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