The botnets evolve every day as more users fail to protect themselves and their computers, helping the attackers expand their malicious attempts. Today, ENISA, the European Network and Information Security Agency, released a report concerning the botnets, revealing that China, US, Germany, Spain and France are the top 5 infected countries when it comes to this kind of threat installed on residents' computers. Moreover, the agency reports that approximately 6 million systems worldwide might represent important components of large botnets. According to the report, most users got themselves infected after they are assaulted by browser exploits, 65 percent of the consumers becoming victims of botnets attempts after this kind of attack.
"Currently, the most dangerous infection method is surfing to an infected webpage. Indications of a bot on your computer include e.g.: Slow Internet connection, strange browser behavior (home page change, new windows, unknown plug-ins), disabled anti-virus software; unknown autostart programs etc," ENISA noted in the report.
source: softpedia