What is the biggest Internet threat? Kindsight, a firm that works with ISPs to detect threats in the network, on Wednesday released a free portal where you can chart the movement of the top 20 Web security threats and top 20 home network intrusions, at any given time.

As of today, the most famous of botnets, the Zeus Trojan, landed at number seven and was detected in 3 percent of all homes. Zeus surfaced twice in the list of top 20 Internet threats as Zbot.

The two rankings are maintained by Kindsight Security Labs, a division that analyzes tens of thousands of malware each day to develop a signature set that looks for symptoms of an infection. In the past, Kindsight focused on enterprise network intrusions, but Kevin McNamee, director of Kindsight Security Labs, said home networks and mobile devices were increasingly being targeted.

In the current lists, McNamee noted the prevalence of bots detected, with four of the top seven network infections deriving from bots and botnets. To rejog your memory, botnets are those massive networks of compromised computers that can be controlled without the owners' knowledge. They're used to make money, typically by sending out mass amounts of spam. For more, check out The Rise of the Botnets.

McNamee said the leak of the Zeus source code, which previously cost cybercriminals thousands of dollars, has inevitably led to the rise in the number of botnets we're seeing today.

Earlier today, the FBI announced the arrest of six Estonian nationals for an elaborate cyber crime ring that hijacked approximately 4 million computers worldwide, including 500,000 in the United States.

For more from Sara, follow her on Twitter @sarapyin.
