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YARA · ditekSHen detection

DITEKSHEN_MALWARE_Win_W1RAT

W1 RAT payload

MalwareW1RATditekSHen 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

W1 RAT payload

Associated malware family: W1RAT.

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
malware-win-w1rat.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_W1RAT : FILE
{
	meta:
		description = "W1 RAT payload"
		author = "ditekSHen"
		id = "d5841bc0-97e7-575e-91f6-d264f507a8b5"
		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#L569-L585"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "84b9a2e309ed9ab0fb8343d941585356d23348683073d0a37fc7194f58a43a0e"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "/c /Ox /Fa\"%s/%s.asm\" /Fo\"%s/%s.obj\" \"%s/%s.%s\"" ascii
		$s2 = "this->piProcInfo.hProcess" fullword ascii
		$s3 = "index >= 0 && index < this->reg_tab->GetLen()" fullword ascii
		$s4 = "strcpy(log_font.lfFaceName,\"%s\");" fullword ascii
		$s5 = "WorkShop -- [%s]" fullword ascii
		$s6 = "HeaderFile.cpp" fullword ascii
		$s7 = "WndLog.cpp" fullword ascii
		$s8 = "assertion fail \"%s\" at file=%s line=%d" fullword ascii
		$s9 = "Stdin   pipe   creation   failed" fullword ascii

	condition:
		( uint16( 0 ) == 0x5a4d and 6 of ( $s* ) ) or ( all of them )
}

Strings (9 patterns)

IdentifierTypeValueModifiers
$s1text"/c /Ox /Fa\"%s/%s.asm\" /Fo\"%s/%s.obj\" \"%s/%s.%s\""ascii
$s2text"this->piProcInfo.hProcess"fullword ascii
$s3text"index >= 0 && index < this->reg_tab->GetLen()"fullword ascii
$s4text"strcpy(log_font.lfFaceName,\"%s\");"fullword ascii
$s5text"WorkShop -- [%s]"fullword ascii
$s6text"HeaderFile.cpp"fullword ascii
$s7text"WndLog.cpp"fullword ascii
$s8text"assertion fail \"%s\" at file=%s line=%d"fullword ascii
$s9text"Stdin pipe creation failed"fullword ascii

Condition

( uint16( 0 ) == 0x5a4d and 6 of ( $s* ) ) or ( all of them )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule must match.
  • At least 6 patterns in ( $s* ) must match.

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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: d5841bc0-97e7-575e-91f6-d264f507a8b5

Tags:FILE

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