SEKOIA_Apt_Gamaredon_Stealer_Obfuscation_2

rule SEKOIA_Apt_Gamaredon_Stealer_Obfuscation_2 : FILE
{
	meta:
		description = "Matches the Gamaredon Stealer obfuscation"
		author = "Sekoia.io"
		id = "fd278a90-537b-4c67-9421-01c9f2416b60"
		date = "2022-02-04"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_gamaredon_stealer_obfuscation_2.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "6ffd8504ba8ca614d3941bd46b944d85e0ad4b9d8d2960d508f50550497d2852"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = { 3d 20 6e 65 77 20 73 74 72 69 6e 67 5b 5d 20 7b 20 [50-200] 20 7d 3b }

	condition:
		uint16be( 0 ) == 0x4d5a and filesize > 100MB and #s1 > 40
}