SEKOIA_Apt_Muddywater_Rotrot_Strings

rule SEKOIA_Apt_Muddywater_Rotrot_Strings : FILE
{
	meta:
		description = "Detects RotRot backdoor based on strings"
		author = "Sekoia.io"
		id = "f7bc195a-0e60-4495-b78a-78f101543700"
		date = "2024-06-10"
		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_rotrot_strings.yar#L1-L36"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "425168003d0f14d791e7f46bf47c18652a1f6b66b9329155d2bca72cf0d8126b"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "qsphsbnebub"
		$s2 = "rtqitcofcvc"
		$s3 = "surjudpgdwd"
		$s4 = "tvskveqhexe"
		$s5 = "uwtlwfrifyf"
		$s6 = "vxumxgsjgzg"
		$t1 = "MpbeMjcsbs"
		$t2 = "NqcfNkdtct"
		$t3 = "OrdgOleudu"
		$t4 = "PsehPmfvev"
		$t5 = "QtfiQngwfw"
		$t6 = "RugjRohxgx"
		$u1 = "UfsnjobufKpcPckfdu"
		$u2 = "VgtokpcvgLqdQdlgev"
		$u3 = "WhuplqdwhMreRemhfw"
		$u4 = "XivqmrexiNsfSfnigx"
		$u5 = "YjwrnsfyjOtgTgojhy"
		$u6 = "ZkxsotgzkPuhUhpkiz"

	condition:
		uint16be( 0 ) == 0x4d5a and filesize > 100KB and filesize < 300KB and any of ( $s* ) and any of ( $t* ) and any of ( $u* )
}