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FIREEYE_RT_Loader_MSIL_DUEDLLIGENCE_1

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
2020-12-18
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 (0 text, 2 hex, 1 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
loader-msil-duedlligence-1.yarBSD 2-Clause License
rule FIREEYE_RT_Loader_MSIL_DUEDLLIGENCE_1 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "d438575f-3cb2-5cff-b5d4-733044f62e61"
		date = "2020-12-18"
		modified = "2020-12-18"
		reference = "https://github.com/mandiant/red_team_tool_countermeasures/"
		source_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/rules/DUEDLLIGENCE/production/yara/Loader_MSIL_DUEDLLIGENCE_1.yar#L5-L15"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		logic_hash = "56237d686b954950849adeedc87d5f9fbff2335a0ff033ba8571b3e3b93f587c"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$create_thread_injected = { 7E [2] 00 0A 0A 16 0B 16 8D [2] 00 01 0C 28 [2] 00 06 2? ?? 2A 28 [2] 00 0A 1E 3? ?? 7E [2] 00 04 7E [2] 00 04 28 [2] 00 0A 28 [2] 00 06 0C 2? ?? 7E [2] 00 04 7E [2] 00 04 28 [2] 00 0A 28 [2] 00 06 0C 7E [2] 00 0A 08 8E 69 7E [2] 00 04 7E [2] 00 04 28 [2] 00 06 0D 09 7E [2] 00 0A 28 [2] 00 0A }
		$iz1 = /_Cor(Exe|Dll)Main/ fullword
		$suspended_process = { 12 ?? FE 15 [2] 00 02 1? ?? FE 15 [2] 00 02 02 14 7E [2] 00 0A 7E [2] 00 0A 16 20 [2] 00 08 7E [2] 00 0A 14 12 ?? 12 ?? 28 [2] 00 06 }

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$create_thread_injectedhex{ 7E [2] 00 0A 0A 16 0B 16 8D [2] 00 01 0C 28 [2] 00 06 2? ?? 2A 28 [2] 00 0A 1E 3? ?? 7E [2] 00 04 7E [2] 00 04 28 [2] 00 0A 28 [2] 00 06 0C 2? ?? 7E [2] 00 04 …
$iz1regex/_Cor(Exe|Dll)Main/fullword
$suspended_processhex{ 12 ?? FE 15 [2] 00 02 1? ?? FE 15 [2] 00 02 02 14 7E [2] 00 0A 7E [2] 00 0A 16 20 [2] 00 08 7E [2] 00 0A 14 12 ?? 12 ?? 28 [2] 00 06 }

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

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: d438575f-3cb2-5cff-b5d4-733044f62e61

Tags:FILE

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