The threat was uncovered by Kaspersky Labs.
Graham Cluley explains:
A piece of malware known as the Magala Trojan Clicker generates money by boosting advertisement click counts.
The threat, detected by Kaspersky Lab as Trojan-Clicker.Win32.Magala, fits in with the unloved Ask Toolbar and other such utilities as a type of potentially unwanted program (PUP).
Skirting the line between adware and malware, Magala doesn't affect a user beyond co-opting some of their machine's computing resources. But it does generate advertising revenue dishonestly and to the detriment of small businesses who pay for those advertisements.