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YARA · Mandiant red team tool countermeasures

FIREEYE_RT_Loader_Win_Generic_18

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

MalwareMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X
Author
FireEye
Date
2020-11-25
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 4 patterns (2 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

loader-win-generic-18.yarBSD 2-Clause License
rule FIREEYE_RT_Loader_Win_Generic_18 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "6f44bd64-29bd-50e2-8b61-7ba61bb1f688"
		date = "2020-11-25"
		date = "2020-11-25"
		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/BEACON/supplemental/yara/Loader_Win_Generic_18.yar#L4-L19"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "c74ebb6c238bbfaefd5b32d2bf7c7fcc"
		logic_hash = "28c9497f646fcf3daf7007d7afd37971dd85382062c064173f13049ad419fef1"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 3

	strings:
		$s0 = { 89 [1-16] FF 15 [4-16] 89 [1-24] E8 [4-16] 89 C6 [4-24] 8D [1-8] 89 [1-4] 89 [1-4] E8 [4-16] 89 [1-8] E8 [4-24] 01 00 00 00 [1-8] 89 [1-8] E8 [4-64] 8A [1-8] 88 }
		$s2 = { 83 EC [4-24] 00 10 00 00 [4-24] C7 44 24 ?? ?? 00 00 00 [0-8] FF 15 [4-24] 89 [1-4] 89 [1-4] 89 [1-8] FF 15 [4-16] 3? ?? 7? [4-24] 20 00 00 00 [4-24] FF 15 [4-32] F3 A5 }
		$si1 = "fread" fullword
		$si2 = "fwrite" fullword

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

Strings (4 patterns)

IdentifierTypeValueModifiers
$s0hex{ 89 [1-16] FF 15 [4-16] 89 [1-24] E8 [4-16] 89 C6 [4-24] 8D [1-8] 89 [1-4] 89 [1-4] E8 [4-16] 89 [1-8] E8 [4-24] 01 00 00 00 [1-8] 89 [1-8] E8 [4-64] 8A [1-8] …
$s2hex{ 83 EC [4-24] 00 10 00 00 [4-24] C7 44 24 ?? ?? 00 00 00 [0-8] FF 15 [4-24] 89 [1-4] 89 [1-4] 89 [1-8] FF 15 [4-16] 3? ?? 7? [4-24] 20 00 00 00 [4-24] FF 15 [4 …
$si1text"fread"fullword
$si2text"fwrite"fullword

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).

  • c74ebb6c238bbfaefd5b32d2bf7c7fcc

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: 6f44bd64-29bd-50e2-8b61-7ba61bb1f688

Metadata

rev3

Tags:FILE