(YARA) YARA_OBF_NET_ConfuserEx

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rule SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24 {
	meta:
		description = "Detects Naming Pattern used by ConfuserEx. ConfuserEx is a widely used open source obfuscator often found in malware"
		author = "Jonathan Peters"
		date = "2024-01-03"
		reference = "https://github.com/yck1509/ConfuserEx/tree/master"
		hash = "2f67f590cabb9c79257d27b578d8bf9d1a278afa96b205ad2b4704e7b9a87ca7"
		score = 60
	strings:
		$s1 = "mscoree.dll" ascii
		$s2 = "mscorlib" ascii 
		$s3 = "System.Private.Corlib" ascii
		$s4 = "#Strings" ascii
		$s5 = { 5F 43 6F 72 [3] 4D 61 69 6E }

		$name_pattern = { E2 ( 80 8? | 81 AA ) E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 [2] E2 80 AE}
	condition:
		uint16(0) == 0x5a4d
		and 2 of ($s*)
		and #name_pattern > 5
}

Associated Techniques