Microsoft and Symantec, working with law enforcement authorities in the US and Spain, have disabled another botnet. The Bamital botnet first appeared in 2009, and at its height, included as many as 1.8 million computers.

User computers became infected with the Bamital malware through drive-by web-based infections (often from porn sites) and corrupted software downloads.

Infected computers were used to generate revenue for the perpetrators by generating or redirecting traffic to specific web sites.