SEKOIA_Tool_Masky_Strings

rule SEKOIA_Tool_Masky_Strings : FILE
{
	meta:
		description = "Detects Masky tool"
		author = "Sekoia.io"
		id = "542670ee-9f2e-4148-853d-a3f055bd584c"
		date = "2022-08-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_masky_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "35dc536879d9464919028ace6b65b225455621035184d7b58468d259ccda62aa"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "caa1aa2e-8a2a-4f98-bc51-b7cf10663fa9" ascii
		$s2 = "Masky" ascii
		$s3 = "\\Windows\\Temp\\" wide
		$s4 = "Length must be non-negative" wide
		$s5 = "CSP does not contain a private key" wide

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and 4 of them or $s1
}