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FIREEYE_RT_APT_Loader_MSIL_TRIMBISHOP_2

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
2020-12-03
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 7 patterns (7 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-loader-msil-trimbishop-2.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Loader_MSIL_TRIMBISHOP_2 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "90ee2569-2e68-517b-b2d7-8c4015d92683"
		date = "2020-12-03"
		date = "2020-12-03"
		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/TRIMBISHOP/production/yara/APT_Loader_MSIL_TRIMBISHOP_2.yar#L4-L22"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "c0598321d4ad4cf1219cc4f84bad4094"
		logic_hash = "4cccfca0c06954105f762066741b6c35599a6c28df8b7c255a2659059169578f"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$ss1 = "\x00NtMapViewOfSection\x00"
		$ss2 = "\x00NtOpenProcess\x00"
		$ss3 = "\x00NtAlertResumeThread\x00"
		$ss4 = "\x00LdrGetProcedureAddress\x00"
		$ss5 = "\x2f(\x00?\x00i\x00)\x00(\x00-\x00|\x00-\x00-\x00|\x00/\x00)\x00(\x00i\x00|\x00I\x00n\x00j\x00e\x00c\x00t\x00)\x00$\x00"
		$ss6 = "\x2d(\x00?\x00i\x00)\x00(\x00-\x00|\x00-\x00-\x00|\x00/\x00)\x00(\x00c\x00|\x00C\x00l\x00e\x00a\x00n\x00)\x00$\x00"
		$tb1 = "\x00DTrim.Execution.DynamicInvoke\x00"

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

Strings (7 patterns)

IdentifierTypeValueModifiers
$ss1text"\x00NtMapViewOfSection\x00"
$ss2text"\x00NtOpenProcess\x00"
$ss3text"\x00NtAlertResumeThread\x00"
$ss4text"\x00LdrGetProcedureAddress\x00"
$ss5text"\x2f(\x00?\x00i\x00)\x00(\x00-\x00|\x00-\x00-\x00|\x00/\x00)\x00(\x00i\x00|\x00I\x00n\x00j\x00e\x00c\x00t\x00)\x00$\x00"
$ss6text"\x2d(\x00?\x00i\x00)\x00(\x00-\x00|\x00-\x00-\x00|\x00/\x00)\x00(\x00c\x00|\x00C\x00l\x00e\x00a\x00n\x00)\x00$\x00"
$tb1text"\x00DTrim.Execution.DynamicInvoke\x00"

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).

  • c0598321d4ad4cf1219cc4f84bad4094

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: 90ee2569-2e68-517b-b2d7-8c4015d92683

Metadata

rev1

Tags:FILE

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