(YARA) YARA_OBF_NET_ConfuserEx_Packer

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rule SUSP_OBF_NET_ConfuserEx_Packer_Jan24 {
	meta:
		description = "Detects binaries packed with ConfuserEx compression packer. This feature compresses and encrypts the actual image into a stub that unpacks and loads the original image on runtime."
		author = "Jonathan Peters"
		date = "2024-01-09"
		reference = "https://github.com/yck1509/ConfuserEx/tree/master"
		hash = "2570bd4c3f564a61d6b3d589126e0940af27715e1e8d95de7863579fbe25f86f"
		score = 70
	strings:
		$s1 = "GCHandle" ascii
		$s2 = "GCHandleType" ascii

		$op1 = { 5A 20 89 C0 3F 14 6A 5E [8-20] 5A 20 FB 56 4D 44 6A 5E 6D 9E }
		$op2 = { 20 61 FF 6F 00 13 ?? 06 13 ?? 16 13 [10-20] 20 1F 3F 5E 00 5A}
		$op3 = { 16 91 7E [3] 04 17 91 1E 62 60 7E [3] 04 18 91 1F 10 62 60 7E [3] 04 19 91 1F 18 62 }
	condition:
		uint16(0) == 0x5a4d
		and all of ($s*)
		and 2 of ($op*)
}

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