/*
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
}