DITEKSHEN_MALWARE_Win_Ransomexx

rule DITEKSHEN_MALWARE_Win_Ransomexx : FILE
{
	meta:
		description = "Detects RansomEXX ransomware"
		author = "ditekshen"
		id = "4d1294de-d73c-5f9c-adb7-18ce5b5aca9f"
		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#L2539-L2555"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "351398d89b847b3439fa58b7aab50f3c6e48be27877d3f8b85cc78e994413ecc"
		score = 75
		quality = 75
		tags = "FILE"
		clamav_sig = "MALWARE.Win.Ransomware.RansomEXX"

	strings:
		$id = "ransom.exx" ascii
		$s1 = "!TXDOT_READ_ME!.txt" fullword wide
		$s2 = "debug.txt" fullword wide
		$s3 = ".txd0t" fullword wide
		$s4 = "crypt_detect" fullword wide
		$s5 = "powershell.exe" fullword wide
		$s6 = "cipher.exe" fullword ascii wide
		$s7 = "?ReflectiveLoader@@" ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( ( $id and 3 of ( $s* ) ) or all of ( $* ) )
}