However, that number is a one-percent decrease from the quarter that ended in June, according to Security Labs, of Mountain View, California, in its third-quarter malware report [].

Based on information , Kindsight reported that 6.5 percent of the home network infections were high-level threats that could turn a home computer into a spam-spewing zombie on a botnet or compromise a computer owner's bank account.

Some 2.2 million home networks worldwide are infected with malware controlled by the ZeroAccess botnet, the report estimated. In North America, one in every 125 home networks are infected with malicious software.

"The ZeroAccess.net has grown significantly to become the most active botnet we've measured this year," Kevin McNamee, Kindsight security architect and director, said in a statement.