SIGNATURE_BASE_MAL_Trojan_DLL_Nov23

rule SIGNATURE_BASE_MAL_Trojan_DLL_Nov23 : CVE_2023_4966 FILE
{
	meta:
		description = "Detects a trojan DLL that installs other components - was seen being used by LockBit 3.0 affiliates exploiting CVE-2023-4966"
		author = "X__Junior"
		id = "1dd87d0a-2b8b-5386-8fdd-40d184c731a4"
		date = "2023-11-23"
		modified = "2023-12-05"
		reference = "https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-325a"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_ransom_lockbit_citrixbleed_nov23.yar#L24-L39"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "e557e1440e394537cca71ed3d61372106c3c70eb6ef9f07521768f23a0974068"
		logic_hash = "9be42742711b4d0440244b507945e074b61c456588580b3263f899a7eb84d8aa"
		score = 80
		quality = 85
		tags = "CVE-2023-4966, FILE"

	strings:
		$op1 = { C7 84 24 ?? ?? ?? ?? 52 70 63 53 C7 84 24 ?? ?? ?? ?? 74 72 69 6E C7 84 24 ?? ?? ?? ?? 67 42 69 6E C7 84 24 ?? ?? ?? ?? 64 69 6E 67 C7 84 24 ?? ?? ?? ?? 43 6F 6D 70 C7 84 24 ?? ?? ?? ?? 6F 73 65 41 C7 84 24 ?? ?? ?? ?? 00 40 01 01 }
		$op2 = { C7 84 24 ?? ?? ?? ?? 6C 73 61 73 C7 84 24 ?? ?? ?? ?? 73 70 69 72 66 C7 84 24 ?? ?? 00 00 70 63 }
		$op3 = { C7 84 24 ?? ?? ?? ?? 4E 64 72 43 C7 84 24 ?? ?? ?? ?? 6C 69 65 6E C7 84 24 ?? ?? ?? ?? 74 43 61 6C C7 84 24 ?? ?? ?? ?? 6C 33 00 8D }

	condition:
		uint16( 0 ) == 0x5a4d and all of them
}