SEKOIA_Malware_Valleyrat_1Ststage_Strings

rule SEKOIA_Malware_Valleyrat_1Ststage_Strings : FILE
{
	meta:
		description = "Detects ValleyRat 1stage"
		author = "Sekoia.io"
		id = "6628ba47-37ad-4bdb-bbc0-7286d777000e"
		date = "2024-06-11"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/malware_valleyrat_1ststage_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "78c45b8bd9241646512483d179d48b0e42e97fa1c18d6afd1af4423f7b7ce3c6"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "%016llX.DLL" wide
		$ = "%s\\%s" wide
		$ = "%016llX\\%s" wide
		$ = "connection already in progress"
		$ = "SleepConditionVariableSRW"

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 4MB and all of them
}