SEKOIA_Ransomware_Win_Avoslocker

rule SEKOIA_Ransomware_Win_Avoslocker : FILE
{
	meta:
		description = "Detect AvosLocker ransomware (2021-07)"
		author = "Sekoia.io"
		id = "fc5c2483-48cb-4282-b6cb-ac728b948607"
		date = "2021-08-03"
		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_avoslocker.yar#L1-L24"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "f810deb1ba171cea5b595c6d3f816127fb182833f7a08a98de93226d4f6a336f"
		hash = "c0a42741eef72991d9d0ee8b6c0531fc19151457a8b59bdcf7b6373d1fe56e02"
		hash = "84d94c032543e8797a514323b0b8fd8bd69b4183f17351628b13d1464093af2d"
		logic_hash = "d7f14f78ac569011ecf964109c72d75de4942361033a544350a2f73c7af64a0c"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "cryptopp850\\rijndael_simd.cpp" ascii
		$s2 = "cryptopp850\\sha_simd.cpp" ascii
		$s3 = "cryptopp850\\gf2n_simd.cpp" ascii
		$s4 = "cryptopp850\\sse_simd.cpp" ascii

	condition:
		all of them and uint16( 0 ) == 0x5A4D and filesize > 900KB and filesize < 950KB
}