Create Maldoc_MIME_ActiveMime_b64.yar

Malicious_Documents/Maldoc_MIME_ActiveMime_b64.yar

+/*
+    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.
+
+*/
+
+rule MIME_MSO_ActiveMime_base64
+{
+	meta:
+		author = "Martin Willing (https://evild3ad.com)"
+		description = "Detect MIME MSO Base64 encoded ActiveMime file"
+		date = "2016-02-28"
+		filetype = "Office documents"
+		
+	strings:
+		$mime = "MIME-Version:"
+		$base64 = "Content-Transfer-Encoding: base64"
+		$mso = "Content-Type: application/x-mso"
+		$activemime = /Q(\x0D\x0A|)W(\x0D\x0A|)N(\x0D\x0A|)0(\x0D\x0A|)a(\x0D\x0A|)X(\x0D\x0A|)Z(\x0D\x0A|)l(\x0D\x0A|)T(\x0D\x0A|)W/
+	
+	condition:
+		$mime at 0 and $base64 and $mso and $activemime
+}