DITEKSHEN_MALWARE_Win_Lockfile

rule DITEKSHEN_MALWARE_Win_Lockfile : FILE
{
	meta:
		description = "Detects LockFile ransomware"
		author = "ditekSHen"
		id = "762ac376-43ff-56d2-b279-2879ce6d8542"
		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#L7998-L8014"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "28c8aa8931d599e5a1860fe2ed0b8172e709dad1a48a319858a907fa775af293"
		score = 75
		quality = 71
		tags = "FILE"

	strings:
		$x1 = "LOCKFILE" fullword ascii
		$x2 = "25a01bb859125507013a2fe9737d3c33" fullword ascii
		$s1 = "</key>" fullword ascii
		$s2 = "<computername>%s</computername>" fullword ascii
		$s3 = "<blocknum>%d</blocknum>" fullword ascii
		$s4 = "%s\\%s-%s-%d%s" fullword ascii
		$s5 = ">RAC=OQD:S>P@:AO?R:EEOS:ARDD=N?EENSB" ascii wide
		$m1 = "<title>LOCKFILE</title>" ascii wide nocase
		$m2 = "<hta:application id=LOCKFILE applicationName=LOCKFILE" ascii wide nocase

	condition:
		uint16( 0 ) == 0x5a4d and ( all of ( $x* ) or all of ( $s* ) or ( 1 of ( $x* ) and ( 2 of ( $s* ) or 1 of ( $m* ) ) ) or ( 1 of ( $m* ) and ( 1 of ( $x* ) or 2 of ( $s* ) ) ) )
}