Skype users are warned to be on their guard, regarding malicious instant messages that have been sent through the service, designed to infect Windows computers.
A malicious worm is taking advantage of the Skype API to spam out messages similar to the one below:
lol is this your new profile pic? http://goo.gl/[REDACTED]?img=[USERNAME]
Clicking on the suspicious links leads to the download of a ZIP files (variously called skype_06102012_image.zip or skype_08102012_image.zip) that contains executable files detected by Sophos anti-virus products as Troj/Agent-YCW or Troj/Agent-YDC.
The Trojan horse opens a backdoor, allowing a remote hacker to take control of infected PCs, communicating with a remote server via HTTP.
On execution the malware copies itself to
and sets the autostart entry as below…
Read more in my article on the Naked Security website.
Found this article interesting? Follow Graham Cluley on Twitter to read more of the exclusive content we post.