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FIREEYE_RT_APT_Hacktool_MSIL_FLUFFY_1

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 3 patterns (1 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-hacktool-msil-fluffy-1.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Hacktool_MSIL_FLUFFY_1 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "6593202d-9b30-59ed-98c0-3e730fb5ceb7"
		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_1.yar#L4-L18"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "11b5aceb428c3e8c61ed24a8ca50553e"
		logic_hash = "4d91c96ab7b628e88f79ee193612acc959448fe2220ef54371f5f5c6e7305d86"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 0E ?? 1? 72 [4] 28 [2] 00 06 [0-16] 28 [2] 00 0A [2-80] 1F 58 0? [0-32] 28 [2] 00 06 [2-32] 1? 28 [2] 00 06 0? 0? 6F [2] 00 06 [2-4] 1F 0B }
		$sb2 = { 73 [2] 00 06 13 ?? 11 ?? 11 ?? 7D [2] 00 04 11 ?? 73 [2] 00 0A 7D [2] 00 04 0E ?? 2D ?? 11 ?? 7B [2] 00 04 72 [4] 28 [2] 00 0A [2-32] 0? 28 [2] 00 0A [2-16] 11 ?? 7B [2] 00 04 0? 28 [2] 00 0A 1? 28 [2] 00 0A [2-32] 7E [2] 00 0A [0-32] FE 15 [2] 00 02 [0-16] 7D [2] 00 04 28 [2] 00 06 [2-32] 7B [2] 00 04 7D [2] 00 04 [2-32] 7C [2] 00 04 FE 15 [2] 00 02 [0-16] 11 ?? 8C [2] 00 02 28 [2] 00 0A 28 [2] 00 0A [2-80] 8C [2] 00 02 28 [2] 00 0A 12 ?? 12 ?? 12 ?? 28 [2] 00 06 }
		$ss1 = "\x00Fluffy\x00"

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$sb1hex{ 0E ?? 1? 72 [4] 28 [2] 00 06 [0-16] 28 [2] 00 0A [2-80] 1F 58 0? [0-32] 28 [2] 00 06 [2-32] 1? 28 [2] 00 06 0? 0? 6F [2] 00 06 [2-4] 1F 0B }
$sb2hex{ 73 [2] 00 06 13 ?? 11 ?? 11 ?? 7D [2] 00 04 11 ?? 73 [2] 00 0A 7D [2] 00 04 0E ?? 2D ?? 11 ?? 7B [2] 00 04 72 [4] 28 [2] 00 0A [2-32] 0? 28 [2] 00 0A [2-16] 1 …
$ss1text"\x00Fluffy\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).

  • 11b5aceb428c3e8c61ed24a8ca50553e

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: 6593202d-9b30-59ed-98c0-3e730fb5ceb7

Metadata

rev1

Tags:FILE

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