DITEKSHEN_MALWARE_Win_Unlockyourfiles

rule DITEKSHEN_MALWARE_Win_Unlockyourfiles : FILE
{
	meta:
		description = "Detects UnlockYourFiles ransomware"
		author = "ditekSHen"
		id = "265f2a48-143a-56c9-9cd4-b5137799a9e8"
		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#L5927-L5946"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "05f549467fac03d4aa2248a9c6c87e4c4273ed6ad727ebb77a4dd115032e454b"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "filesx0" wide
		$s2 = "_auto_file" wide
		$s3 = "<EncyptedKey>" fullword wide
		$s4 = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\" wide
		$s5 = "DecryptAllFile" fullword ascii
		$s6 = "AES_Only_Decrypt_File" fullword ascii
		$m1 = "Free files decrypted" wide
		$m2 = "Restore my files" wide
		$m3 = "Type tour password..." wide
		$m4 = "files encrypted by strong password" ascii
		$m5 = "buy bitcoin" ascii
		$m6 = "Unlock File" fullword wide

	condition:
		uint16( 0 ) == 0x5a4d and ( 4 of ( $s* ) or 5 of ( $m* ) or ( 2 of ( $s* ) and 2 of ( $m* ) ) )
}