Antivirus maker ESET has discovered a new Windows malware strain that uses infected computers to send out spam campaigns. However, one of this malware's most peculiar features is a hidden function that records the victim's desktop when the user visits an adult website.

Named Varenyky, the malware emerged in May this year, and has only been active in France, ESET said.

PRIMARY FEATURE IS SENDING OUT SPAM

The group behind Varenyky uses spam emails carrying malicious invoices to infect users. Once on a host, the malware's primary purpose is to send out spam of its own.

The outgoing spam, targets French users, and only customers of Orange S.A., a French ISP.