A new worm targeting Skype users with spam messages designed to infect machines with the Dorkbot ransomware has been discovered. A malicious worm is taking advantage of the Skype API to spam out messages that link to a ZIP file. Messages link to ZIP files, which is actually detected as Troj/Agent-YCW. The worm is also known as NRGbot, which appears to initiate large scale click-fraud activity on each compromised machine as well as recruiting it into a botnet. Ransomware is becoming a common tool in cyber criminals arsenal.
Source: https://thehackernews.com/2012/10/ransomware-malware-targeting-skype-users.html