DITEKSHEN_MALWARE_Win_Rhysida

rule DITEKSHEN_MALWARE_Win_Rhysida : FILE
{
	meta:
		description = "Detects Rhysida ransomware"
		author = "ditekSHen"
		id = "a70bdf19-3b56-5dc0-be74-20a2e85099cc"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L10888-L10902"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "fb15f497cdee40b237dfc2aafcde2da95ff2a6f9c162273862ec1a0053269932"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "cmd.exe /c reg add \"HK" ascii
		$s2 = "rundll32.exe user32.dll,UpdatePerUserSystemParameters" fullword ascii
		$s3 = "C:/Users/Public/bg.jpg" fullword ascii
		$s4 = "CriticalBreachDetected.pdf" fullword ascii
		$s5 = "rhysida" ascii
		$s6 = "cmd.exe /c reg delete \"HKCU\\Cont" ascii
		$s7 = "Rhysida-" ascii

	condition:
		uint16( 0 ) == 0x5a4d and 5 of ( $s* ) or ( 3 of ( $s* ) and #s1 > 5 )
}