SEKOIA_Ransomware_Win_Shrinklocker

rule SEKOIA_Ransomware_Win_Shrinklocker
{
	meta:
		description = "Detects files related to the ShrinkLocker ransomware"
		author = "Sekoia.io"
		id = "93a6fbdd-ad62-456a-a1a5-b5ae3b242004"
		date = "2024-06-07"
		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_shrinklocker.yar#L1-L25"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "7770b0946b9bb482f23c4ce0d753393e0d42a6fd8b31029847d74356296f0cf1"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$a = "shrinkdisk" ascii fullword
		$b = "BitLocker" ascii fullword
		$c = "diskpart" ascii fullword
		$d = "disk.vbs" ascii fullword
		$e = "strDriveLetter" ascii fullword
		$f = "shrinkcomplate" ascii fullword
		$g = "ADODB.Stream" ascii fullword
		$h = "Win32_OperatingSystem" ascii fullword
		$i = "HKLM\\System\\CurrentControlSet\\Control\\Terminal Server" ascii fullword
		$j = "HKLM\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System" ascii fullword
		$k = "HKLM\\SOFTWARE\\Policies\\Microsoft\\FVE" ascii fullword

	condition:
		9 of them
}