SEKOIA_Ransomware_Win_Karma

rule SEKOIA_Ransomware_Win_Karma : FILE
{
	meta:
		description = "Detect the Karma ransomware payload"
		author = "Sekoia.io"
		id = "efd87a17-7c99-404a-8ea6-2f5c2121f9f2"
		date = "2021-08-25"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/ransomware_win_karma.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "ef272be7ae5fea084120db95f7b002e9061d72442836e836ca43ddc7b461be4e"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$a1 = "KARMA" ascii
		$u1 = "KARMA" wide
		$u2 = "-ENCRYPTED.txt" wide
		$u3 = "Encrypting directory:" wide
		$u4 = "Encrypting file:" wide
		$u5 = "Trying to import ECC public key..." wide

	condition:
		uint16( 0 ) == 0x5A4D and filesize < 150KB and all of them
}