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DITEKSHEN_MALWARE_Win_Babylockerkz

Detects BabyLockerKZ

MalwareBabylockerkzditekSHen 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 BabyLockerKZ

Associated malware family: Babylockerkz.

Targets: Windows PE.

It defines 11 patterns (11 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-babylockerkz.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Babylockerkz : FILE
{
	meta:
		description = "Detects BabyLockerKZ"
		author = "ditekshen"
		id = "faa35818-2bed-528f-a6f0-5356a723ef5b"
		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#L11939-L11957"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "423bbd3b23591608a32e4e724c156fbaa5d1d087515137a82a0aeb8c4865d1ca"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = ":\\locker\\bin\\stub_win_x64_encrypter.pdb" ascii
		$s2 = "taskkill /f /im explorer.exe" fullword wide
		$s3 = "\\SysWOW64\\cmd.exe /c %windir%\\" wide
		$s4 = "[!] Failed to RunNonElevated: %s, error 0x%X" fullword wide
		$s5 = "[!] Failed to run sync command: %s, error 0x%X" fullword wide
		$s6 = "[-] RunNonElevated: %s" fullword wide
		$s7 = "[!][Encrypt] Not" fullword
		$s8 = "[-] sALLUSERSPROFILE: %s" fullword wide
		$s9 = "[!] WNetGetConnection failed 0x%X" fullword wide
		$s10 = "[!][Scan] " wide
		$s11 = "[-] Start encrypt" wide

	condition:
		uint16( 0 ) == 0x5a4d and 4 of them
}

Strings (11 patterns)

IdentifierTypeValueModifiers
$s1text":\\locker\\bin\\stub_win_x64_encrypter.pdb"ascii
$s2text"taskkill /f /im explorer.exe"fullword wide
$s3text"\\SysWOW64\\cmd.exe /c %windir%\\"wide
$s4text"[!] Failed to RunNonElevated: %s, error 0x%X"fullword wide
$s5text"[!] Failed to run sync command: %s, error 0x%X"fullword wide
$s6text"[-] RunNonElevated: %s"fullword wide
$s7text"[!][Encrypt] Not"fullword
$s8text"[-] sALLUSERSPROFILE: %s"fullword wide
$s9text"[!] WNetGetConnection failed 0x%X"fullword wide
$s10text"[!][Scan] "wide
$s11text"[-] Start encrypt"wide

Condition

uint16( 0 ) == 0x5a4d and 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 4 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: faa35818-2bed-528f-a6f0-5356a723ef5b

Tags:FILE

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