SEKOIA_Apt_Oilrig_Powerexchange

rule SEKOIA_Apt_Oilrig_Powerexchange : FILE
{
	meta:
		description = "Detects OilRig's PowerExchange backdoor"
		author = "Sekoia.io"
		id = "cb6b370f-7b05-480b-865e-ac81ded4a2a4"
		date = "2023-10-24"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_oilrig_powerexchange.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "5e505e9bbb17500f7e9a316b66bccb62089172582478230e0bda736bbefa1fd6"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "($h.value).PadRight((($h.value).Length+($h.value).Length%4),'='" ascii wide
		$ = "(($h.value).Length%4 -ne 0)" ascii wide
		$ = "-match \"@@(.*)@@\"" ascii wide
		$ = "[Environment]::NewLine+$_.Exception.Message | Out-File -FilePath" ascii wide
		$ = "ContainsSubjectStrings.Add(\"@@\")" ascii wide

	condition:
		2 of them and filesize < 50KB
}