SEKOIA_Koiloader_Powershell_Reflective_Loading

rule SEKOIA_Koiloader_Powershell_Reflective_Loading : FILE
{
	meta:
		description = "Powershell script loading service.exe (related to Koi Loader)"
		author = "Sekoia.io"
		id = "9bbe4cea-3e64-4377-bf93-def9fb629734"
		date = "2024-03-20"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/koiloader_powershell_reflective_loading.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "27deec01027a73129c6c8057eff1b48190c89ac18dcd7c390fc177d82a897290"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "[Byte[]]$image" ascii fullword
		$s2 = "function GDT"
		$s3 = "function GPA"
		$s4 = "GDT @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr])"
		$s5 = "$marshal::GetDelegateForFunctionPointer($CTAddr, $CTDeleg)"

	condition:
		$s1 at 0 and 4 of them
}