SEKOIA_Guloader_Unpacker

rule SEKOIA_Guloader_Unpacker : FILE
{
	meta:
		description = "GuLoader Unpacker"
		author = "Sekoia.io"
		id = "dee4cad4-e3b4-4a12-860b-ff750b119fa8"
		date = "2024-02-07"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/guloader_unpacker.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "6be9d7fa829480466aef2a7e78a7dadfac92f7774ab3374254305040c105496f"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$p1 = "([Parameter(Position = 0)] [Type[]] $" base64
		$p2 = "+=2){" base64
		$p3 = "}else {" base64

	condition:
		$p1 in ( filesize -30000 .. filesize ) and $p2 in ( filesize -30000 .. filesize ) and $p3 in ( filesize -30000 .. filesize ) and filesize > 300KB
}