An unusual botnet that has ensnared more than 12,500 systems disguises itself as a legitimate add-on for Mozilla Firefox and forces infected PCs to scour Web sites for security vulnerabilities. The botnet, dubbed Advanced Power by its operators, appears to have been quietly working since at least May 2013. The malware enslaves PCs in a Botnet that conducts SQL injection attacks on virtually any Web sites visited by the victim. The attackers can use this access to booby-trap sites with drive-by malware attacks, or force sites to cough up their databases.”]
Source: https://krebsonsecurity.com/2013/12/botnet-enlists-firefox-users-to-hack-web-sites/