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DITEKSHEN_MALWARE_Win_Ktlvdoor

Detects KTLVdoor

MalwareKtlv DoorditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekshen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 73

What this rule detects

Detects KTLVdoor

Associated malware family: Ktlv Door.

Targets: Windows PE.

It defines 26 patterns (24 text, 0 hex, 2 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-ktlvdoor.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Ktlvdoor : FILE
{
	meta:
		description = "Detects KTLVdoor"
		author = "ditekshen"
		id = "f63ebd05-fb4b-50fb-887b-dacd379594a4"
		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#L11758-L11791"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "3ced9b558c7e17acd015cd2c9dd0c5d024bf9c31c7f2e7c9b7b937124109cf8b"
		score = 75
		quality = 73
		tags = "FILE"

	strings:
		$s1 = "/cmd/acc/agent_acc" ascii
		$s2 = "main.DLLWMain" ascii
		$s3 = "main.checkSilent" ascii
		$h1 = ".handleInteractiveShell" ascii
		$h2 = ".handleNetstat" ascii
		$h3 = ".handleProcess" ascii
		$h4 = ".handleRefreshHostInfo" ascii
		$h5 = ".handleTimestomp" ascii
		$h6 = ".handleSoInject" ascii
		$h7 = ".HandleRegInfo" ascii
		$h8 = ".handlePortscan" ascii
		$h9 = ".handleReflectDllInject" ascii
		$h10 = ".handleFileDownload" ascii
		$f1 = ".RdpWithNTLM." ascii
		$f2 = ".FingerPrintOs." ascii
		$f3 = ".ScanWMI." ascii
		$f4 = ".ScanWinRM." ascii
		$f5 = ".ScanWeb." ascii
		$f6 = ".ScanSmb2." ascii
		$f7 = ".ScanRDP." ascii
		$f8 = ".ScanPing." ascii
		$f9 = ".ScanOxid." ascii
		$f10 = ".ScanMssql." ascii
		$f11 = ".ScanBanner." ascii
		$fr1 = /\.proxy[CS]2[CS](TC|UD)P/ ascii
		$fr2 = /\.Scan(WMI|WinRM|Web|Smb2|RDP|Ping|Oxid|Mssql|Banner)\./ ascii

	condition:
		( uint16( 0 ) == 0x5a4d or uint16( 0 ) == 0x457f ) and ( ( 6 of ( $h* ) ) or ( 12 of ( $f* ) ) or ( 2 of ( $h* ) and 4 of ( $f* ) ) or ( 1 of ( $s* ) and ( 4 of ( $h* ) or 4 of ( $f* ) ) ) or ( 13 of them ) )
}

Strings (26 patterns)

IdentifierTypeValueModifiers
$s1text"/cmd/acc/agent_acc"ascii
$s2text"main.DLLWMain"ascii
$s3text"main.checkSilent"ascii
$h1text".handleInteractiveShell"ascii
$h2text".handleNetstat"ascii
$h3text".handleProcess"ascii
$h4text".handleRefreshHostInfo"ascii
$h5text".handleTimestomp"ascii
$h6text".handleSoInject"ascii
$h7text".HandleRegInfo"ascii
$h8text".handlePortscan"ascii
$h9text".handleReflectDllInject"ascii
$h10text".handleFileDownload"ascii
$f1text".RdpWithNTLM."ascii
$f2text".FingerPrintOs."ascii
$f3text".ScanWMI."ascii
$f4text".ScanWinRM."ascii
$f5text".ScanWeb."ascii
$f6text".ScanSmb2."ascii
$f7text".ScanRDP."ascii
$f8text".ScanPing."ascii
$f9text".ScanOxid."ascii
$f10text".ScanMssql."ascii
$f11text".ScanBanner."ascii
$fr1regex/\.proxy[CS]2[CS](TC|UD)P/ascii
$fr2regex/\.Scan(WMI|WinRM|Web|Smb2|RDP|Ping|Oxid|Mssql|Banner)\./ascii

Condition

( uint16( 0 ) == 0x5a4d or uint16( 0 ) == 0x457f ) and ( ( 6 of ( $h* ) ) or ( 12 of ( $f* ) ) or ( 2 of ( $h* ) and 4 of ( $f* ) ) or ( 1 of ( $s* ) and ( 4 of ( $h* ) or 4 of ( $f* ) ) ) or ( 13 of them ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 6 patterns in ( $h* ) must match.
  • At least 12 patterns in ( $f* ) must match.
  • At least 2 patterns in ( $h* ) must match.
  • At least 4 patterns in ( $f* ) must match.
  • At least 1 patterns in ( $s* ) must match.
  • At least 4 patterns in ( $h* ) must match.
  • At least 13 patterns in the rule 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: f63ebd05-fb4b-50fb-887b-dacd379594a4

Tags:FILE

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