YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Hacktool_MSIL_SHARPSTOMP_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: 2020-12-02
Modified: 2020-12-09
Score / Quality: 75 / 71

What this rule detects

No description has been set in the source file - FireEye-RT

Targets: Windows PE.

It defines 9 patterns (9 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-hacktool-msil-sharpstomp-1.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Hacktool_MSIL_SHARPSTOMP_1 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "4b4a54c8-9717-5fbb-8130-a49162bc6b07"
		date = "2020-12-02"
		date = "2020-12-02"
		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/SHARPSTOMP/production/yara/APT_HackTool_MSIL_SHARPSTOMP_1.yar#L4-L24"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "83ed748cd94576700268d35666bf3e01"
		logic_hash = "af8aa0e87d8b6623a908fde5014f3849cd0ca20d5926c798be82ce4eab2668bb"
		score = 75
		quality = 71
		tags = "FILE"
		rev = 3

	strings:
		$s0 = "mscoree.dll" fullword nocase
		$s1 = "timestompfile" fullword nocase
		$s2 = "sharpstomp" fullword nocase
		$s3 = "GetLastWriteTime" fullword
		$s4 = "SetLastWriteTime" fullword
		$s5 = "GetCreationTime" fullword
		$s6 = "SetCreationTime" fullword
		$s7 = "GetLastAccessTime" fullword
		$s8 = "SetLastAccessTime" fullword

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

Strings (9 patterns)

Identifier	Type	Value	Modifiers
$s0	text	"mscoree.dll"	fullword nocase
$s1	text	"timestompfile"	fullword nocase
$s2	text	"sharpstomp"	fullword nocase
$s3	text	"GetLastWriteTime"	fullword
$s4	text	"SetLastWriteTime"	fullword
$s5	text	"GetCreationTime"	fullword
$s6	text	"SetCreationTime"	fullword
$s7	text	"GetLastAccessTime"	fullword
$s8	text	"SetLastAccessTime"	fullword

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).

83ed748cd94576700268d35666bf3e01

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: 4b4a54c8-9717-5fbb-8130-a49162bc6b07

Metadata

rev	3

Tags:FILE

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