YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Hacktool_MSIL_FLUFFY_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: 2020-12-04
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 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-hacktool-msil-fluffy-2.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Hacktool_MSIL_FLUFFY_2 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "ce39710e-7649-5f7d-bbbe-65dc30f678e8"
		date = "2020-12-04"
		date = "2020-12-04"
		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/FLUFFY/production/yara/APT_HackTool_MSIL_FLUFFY_2.yar#L4-L21"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "11b5aceb428c3e8c61ed24a8ca50553e"
		logic_hash = "872ab717668375a49d6c7b1927a680747b405c0198fe4fc6f43ccc562870eb37"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$s1 = "\x00Asktgt\x00"
		$s2 = "\x00Kerberoast\x00"
		$s3 = "\x00HarvestCommand\x00"
		$s4 = "\x00EnumerateTickets\x00"
		$s5 = "[*] Action: " wide
		$s6 = "\x00Fluffy.Commands\x00"

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

Strings (6 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"\x00Asktgt\x00"
$s2	text	"\x00Kerberoast\x00"
$s3	text	"\x00HarvestCommand\x00"
$s4	text	"\x00EnumerateTickets\x00"
$s5	text	"[*] Action: "	wide
$s6	text	"\x00Fluffy.Commands\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

https://github.com/mandiant/red_team_tool_countermeasures/

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

11b5aceb428c3e8c61ed24a8ca50553e

Licence & attribution

Author: FireEye

Source repository: Mandiant red team tool countermeasures @ 3561b71724

Licence: BSD 2-Clause License (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: ce39710e-7649-5f7d-bbbe-65dc30f678e8

Metadata

rev	1

Tags:FILE

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