I published the following diary on isc.sans.org: “Voice Message Notifications Deliver Ransomware“.
Bad guys need to constantly find new ways to lure their victims. If billing notifications were very common for a while, not all people in a company are working with such kind of documents. Which types of notification do they have in common? All of them have a phone number and with modern communication channels (“Unified Communications”) like Microsoft Lync or Cisco, everybody can receive a mail with a voice mail notification. Even residential systems can deliver voice message notifications…[Read more]