Anti-spyware software that pushes fraudulent PC scans has found its way onto DoubleClick and legitimate sites, including CNN, The Economist, The Huffington Post and the official site of the Philadelphia Phillies.

DoubleClick officials have release a statement saying that they have recently implemented a security monitoring system to catch and disable a new strain of malware that has spread over the past several months. This system has already captured and disabled about 100 ads.

The bogus anti-spyware onslaught is only part of a bigger wave being swapped for normal ads on sites such as The Wall Street Journal.

Sunbelt Software has confirmed that Trojans were being downloaded from ads served by DoubleClick as recently as Nov. 11. This malware is the kind that repeatedly pops bogus warning messages about computer infections in users' faces until they give up in despair and pay for protection software. For the full article see eWeek.com