SEKOIA_Apt_Muddywater_Powgoop_Decode_Loop

rule SEKOIA_Apt_Muddywater_Powgoop_Decode_Loop : FILE
{
	meta:
		description = "Detects the loop used in PowGoop and its loader"
		author = "Sekoia.io"
		id = "644ed1c4-e0e1-496e-9efc-7d9e15565f7b"
		date = "2022-01-13"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_muddywater_powgoop_decode_loop.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "1d60f53014fb1934a85a573856244431c8f565c2f024511991817e6235566815"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "System.Collections.Generic.List[System.Object]" ascii wide
		$s2 = "$d.Add($in[$i]);" ascii wide
		$s3 = "[System.Convert]::FromBase64String(" ascii wide

	condition:
		filesize < 1MB and $s2 in ( @s1 .. @s1 + 400 ) and $s3 in ( @s1 .. @s1 + 400 )
}