Threats to Confidential Information by Volume

In the last six months of 2007, threats to confidential information made up 68% of the volume of the top 50 malicious code samples causing potential infections. This is an increase over the 65% reported in the first half of 2007 and the 53% from the same period in 2006. Malicious code can expose confidential information in a variety of ways. The most common method is by allowing remote access to the compromised computer through a back door.

Symantec Internet Security Threat Report, Vol. XIII