Skype users are currently in danger of getting saddled with this type of malware.
According to Kaspersky Lab expert Dmitry Bestuzhev, messages received from friends saying "this is my favorite picture of you" and offering a shortened link will direct users to a compromised website serving a dropper Trojan.
Once installed and run, the dropper "delivers" many other pieces of malware, including one that has Bitcoin-mining capabilities.
"If you see your machine is working hard, using all available CPU resources, you may be infected," warns Bestuzhev.
The campaign, started last week, has been quite successful. At its height, some 2,000 users would click on the link and get infected, since the dropper had a very low detection rate.
By subscribing to our early morning news update, you will receive a daily digest of the latest security news published on Help Net Security.
With over 500 issues so far, reading our newsletter every Monday morning will keep you up-to-date with security risks out there.