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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_PWSHDLLDL

Detects downloader

MalwarePWSHDLLDLditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekShen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detects downloader

Associated malware family: PWSHDLLDL.

Targets: Windows PE.

It defines 8 patterns (6 text, 2 hex, 0 regex). YARA modules used: pe.

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

malware-win-pwshdlldl.yarBSD 2-Clause License
import "pe"

rule DITEKSHEN_MALWARE_Win_PWSHDLLDL : FILE
{
	meta:
		description = "Detects downloader"
		author = "ditekShen"
		id = "553ed216-c8c2-504f-b689-0e8d21a00eaa"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L11288-L11303"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "7acef81f0e6e282650c161963599dcbe2b3975d482eb7c330581901b0fe85655"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "powershell.exe Set-ExecutionPolicy Bypass -Scope Process ; powershell -file " fullword wide nocase
		$s2 = "objShell.run \"powershell -WindowStyle hidden -command wscript.exe //b //nologo '" fullword wide nocase
		$s3 = "cmd.exe /c schtasks.exe /create /tn \"" fullword wide nocase
		$s4 = "-WindowStyle hidden -command wscript.exe //b //nologo '" fullword wide nocase
		$s6 = "\" /tr \"wscript.exe //b //nologo '" fullword wide nocase
		$s7 = "\" -Value \"Powershell.exe -WindowStyle hidden \"\"& '" fullword wide nocase
		$op0 = { 61 01 00 34 53 79 73 74 65 6d 2e 57 65 62 2e 53 }
		$op1 = { 4b 04 00 00 34 01 00 00 7f 05 00 00 1a }

	condition:
		uint16( 0 ) == 0x5a4d and pe.is_dll ( ) and 5 of them
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$s1text"powershell.exe Set-ExecutionPolicy Bypass -Scope Process ; powershell -file "fullword wide nocase
$s2text"objShell.run \"powershell -WindowStyle hidden -command wscript.exe //b //nologo '"fullword wide nocase
$s3text"cmd.exe /c schtasks.exe /create /tn \""fullword wide nocase
$s4text"-WindowStyle hidden -command wscript.exe //b //nologo '"fullword wide nocase
$s6text"\" /tr \"wscript.exe //b //nologo '"fullword wide nocase
$s7text"\" -Value \"Powershell.exe -WindowStyle hidden \"\"& '"fullword wide nocase
$op0hex{ 61 01 00 34 53 79 73 74 65 6d 2e 57 65 62 2e 53 }
$op1hex{ 4b 04 00 00 34 01 00 00 7f 05 00 00 1a }

Condition

uint16( 0 ) == 0x5a4d and pe.is_dll ( ) and 5 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 5 patterns in the rule must match.
  • Uses the pe module.
  • Requires a DLL.

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References

Licence & attribution

Author: ditekShen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 553ed216-c8c2-504f-b689-0e8d21a00eaa

Tags:FILE

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