A clever spam campaign is underway that pretends to be a WebEx meeting invite and uses a Cisco open redirect that pushes a Remote Access Trojan to the recipient.  Using open redirects add legitimacy to spam URLs and increases the chances that victims will click on an URL. […]

from https://www.bleepingcomputer.com/news/security/clever-webex-spam-use-cisco-redirect-to-deliver-rat-malware/