ESET_Apt_Windows_Invisimole_SFX_Dropper

rule ESET_Apt_Windows_Invisimole_SFX_Dropper : FILE
{
	meta:
		description = "Detects trojanized InvisiMole files: patched RAR SFX droppers with added InvisiMole blobs (config encrypted XOR 2A at the end of a file)"
		author = "ESET Research"
		id = "08490bcd-3139-5fac-9c6c-5a32acb7217a"
		date = "2021-05-17"
		modified = "2021-05-17"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/invisimole/invisimole.yar#L79-L95"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "6ca248d42c1e889988e5931d80df071cb20e623fb0c4a208044cabe073f71ce4"
		score = 75
		quality = 80
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$encrypted_config = {5F 59 4F 58 19 18 04 4E 46 46 2A 5D 59 5A 58 43 44 5E 4C 7D 2A 0F 2A 59 2A 78 2A 4B 2A 58 2A 0E 2A 6F 2A 72 2A 4B 2A 0F 2A 4E 2A 04 2A 0F 2A 4E 2A 76 2A 0F 2A 79 2A 2A 2A 79 42 4F 46 46 6F 52 4F 49 5F 5E 4F 7D 2A 79 42 4F 46 46 19 18 04 4E 46 46 2A 7C 43 58 5E 5F 4B 46 6B 46 46 45 49 2A 66 45 4B 4E 66 43 48 58 4B 58 53 6B}

	condition:
		uint16( 0 ) == 0x5A4D and $encrypted_config
}