SIGNATURE_BASE_APT_MAL_UNC4841_SEASPY_Jun23_1

rule SIGNATURE_BASE_APT_MAL_UNC4841_SEASPY_Jun23_1 : CVE_2023_2868 FILE
{
	meta:
		description = "Detects SEASPY malware used by UNC4841 in attacks against Barracuda ESG appliances exploiting CVE-2023-2868"
		author = "Florian Roth"
		id = "bcff58f8-87f6-5371-8b96-5d4c0f349000"
		date = "2023-06-16"
		modified = "2023-12-05"
		reference = "https://blog.talosintelligence.com/alchimist-offensive-framework/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_barracuda_esg_unc4841_jun23.yar#L30-L55"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "3f26a13f023ad0dcd7f2aa4e7771bba74910ee227b4b36ff72edc5f07336f115"
		logic_hash = "c1dcb841fb872f0d5e661bfd90fca3075f5efc95b1f9dfff72fa318ed131e9d1"
		score = 85
		quality = 85
		tags = "CVE-2023-2868, FILE"

	strings:
		$sx1 = "usage: ./BarracudaMailService <Network-Interface>. e.g.: ./BarracudaMailService eth0" ascii fullword
		$s1 = "fcntl.tmp.amd64." ascii
		$s2 = "Child process id:%d" ascii fullword
		$s3 = "[*]Success!" ascii fullword
		$s4 = "NO port code" ascii
		$s5 = "enter open tty shell" ascii
		$op1 = { 48 89 c6 f3 a6 0f 84 f7 01 00 00 bf 6c 84 5f 00 b9 05 00 00 00 48 89 c6 f3 a6 0f 84 6a 01 00 00 }
		$op2 = { f3 a6 0f 84 d2 00 00 00 48 89 de bf 51 5e 61 00 b9 05 00 00 00 f3 a6 74 21 48 89 de }
		$op3 = { 72 de 45 89 f4 e9 b8 f4 ff ff 48 8b 73 08 45 85 e4 ba 49 3d 62 00 b8 44 81 62 00 48 0f 45 d0 }

	condition:
		uint16( 0 ) == 0x457f and filesize < 9000KB and 3 of them or 5 of them
}