YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Loader_Win32_Dshell_3

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: 2020-11-27
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 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-loader-win32-dshell-3.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Loader_Win32_Dshell_3 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "6b6fccef-ac93-5f1b-b9b6-c2d3ee4d8da7"
		date = "2020-11-27"
		date = "2020-11-27"
		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/DSHELL/production/yara/APT_Loader_Win32_DShell_3.yar#L4-L19"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "12c3566761495b8353f67298f15b882c"
		logic_hash = "ec2a8b0abc6cb6d1861199b892fbe84782b42babb08e3ea203d10ab17ff7a20a"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$sb1 = { 6A 40 68 00 30 00 00 [4-32] E8 [4-8] 50 [0-16] E8 [4-150] 6A FF [1-32] 6A 00 6A 00 5? 6A 00 6A 00 [0-32] E8 [4] 50 }
		$ss1 = "\x00CreateThread\x00"
		$ss2 = "base64.d" fullword
		$ss3 = "core.sys.windows" fullword

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them
}

Strings (4 patterns)

Identifier	Type	Value	Modifiers
$sb1	hex	{ 6A 40 68 00 30 00 00 [4-32] E8 [4-8] 50 [0-16] E8 [4-150] 6A FF [1-32] 6A 00 6A 00 5? 6A 00 6A 00 [0-32] E8 [4] 50 }
$ss1	text	"\x00CreateThread\x00"
$ss2	text	"base64.d"	fullword
$ss3	text	"core.sys.windows"	fullword

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) 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).

12c3566761495b8353f67298f15b882c

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: 6b6fccef-ac93-5f1b-b9b6-c2d3ee4d8da7

Metadata

rev	1

Tags:FILE

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