SEKOIA_Luckymouse_Sysupdate_Payload

rule SEKOIA_Luckymouse_Sysupdate_Payload : FILE
{
	meta:
		description = "Detects decryption routine prologue of sysupdate samples"
		author = "Sekoia.io"
		id = "97df4700-de35-49a0-869e-ed89a6d9cbdd"
		date = "2022-08-19"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/luckymouse_sysupdate_payload.yar#L1-L16"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "e8501a50c65330153e613ae5bd6bbfbe4372d85175c3ed81d202ec5f177a94be"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = { DB ?? ?? C9 66 B9 ?? ?? E8 FF FF FF FF }

	condition:
		filesize < 1MB and all of them
}