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YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Backdoor_Macos_GORAT_1

This rule is looking for specific strings associated with network activity found within the MacOS generated variant of GORAT

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X
Author
FireEye
Date
2020-12-08
Modified
2020-12-09
Score / Quality
75 / 75

What this rule detects

This rule is looking for specific strings associated with network activity found within the MacOS generated variant of GORAT

Targets: macOS Mach-O.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-backdoor-macos-gorat-1.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Backdoor_Macos_GORAT_1 : FILE
{
	meta:
		description = "This rule is looking for specific strings associated with network activity found within the MacOS generated variant of GORAT"
		author = "FireEye"
		id = "4646eadb-7acf-582f-9ad6-00f012ceed8a"
		date = "2020-12-08"
		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/REDFLARE (Gorat)/production/yara/APT_Backdoor_MacOS_GORAT_1.yar#L4-L19"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "68acf11f5e456744262ff31beae58526"
		logic_hash = "2df5f87d44968670511880d21ad184779d0561c7c426a5d6426bcefd0904a9b7"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 3

	strings:
		$s1 = "SID1=%s" ascii wide
		$s2 = "http/http.dylib" ascii wide
		$s3 = "Mozilla/" ascii wide
		$s4 = "User-Agent" ascii wide
		$s5 = "Cookie" ascii wide

	condition:
		(( uint32( 0 ) == 0xBEBAFECA ) or ( uint32( 0 ) == 0xFEEDFACE ) or ( uint32( 0 ) == 0xFEEDFACF ) or ( uint32( 0 ) == 0xCEFAEDFE ) ) and all of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"SID1=%s"ascii wide
$s2text"http/http.dylib"ascii wide
$s3text"Mozilla/"ascii wide
$s4text"User-Agent"ascii wide
$s5text"Cookie"ascii wide

Condition

(( uint32( 0 ) == 0xBEBAFECA ) or ( uint32( 0 ) == 0xFEEDFACE ) or ( uint32( 0 ) == 0xFEEDFACF ) or ( uint32( 0 ) == 0xCEFAEDFE ) ) and all of them

In plain words (Heuristic)

  • The file must start with a Mach-O / fat binary magic — a macOS executable.
  • 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).

  • 68acf11f5e456744262ff31beae58526

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: 4646eadb-7acf-582f-9ad6-00f012ceed8a

Metadata

rev3

Tags:FILE

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