DITEKSHEN_MALWARE_Win_Rapid

rule DITEKSHEN_MALWARE_Win_Rapid : FILE
{
	meta:
		description = "Detects Rapid ransomware"
		author = "ditekSHen"
		id = "3a23f344-8345-5ae8-aacb-f2f422d3fc9d"
		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#L8563-L8585"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "c3f1bffeb402951da8bcccc899b2cdeb3c218b342d8338c750b9ff275537b4b5"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "encblklen" fullword ascii
		$s2 = ".rapid" fullword ascii
		$s3 = "BgIAAACkAABSU0E" ascii
		$s4 = "IFdlIHNlbmQ" ascii
		$s5 = "Software\\EncryptKeys" fullword ascii
		$s6 = "local_enc_private_key" fullword ascii
		$s7 = "local_public_key" fullword ascii
		$s8 = "How Recovery Files.txt" ascii
		$s9 = "recovery.txt" ascii
		$s10 = "thr %i run %s" fullword ascii
		$s11 = " /TN Encrypter" ascii
		$s12 = /Encrypter_\d+/ fullword ascii
		$s13 = "BleepingComputer_rapid" ascii wide
		$m1 = "tell us your unique ID - ID-" ascii
		$m2 = "really want to restore your files?" ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( 6 of ( $s* ) or ( 1 of ( $m* ) and 4 of ( $s* ) ) )
}