The attackers behind the insidious Koobface worm have taken to using Google Reader accounts that they control to spread the worm through shared Reader items. The infection method is another indication of the resilience and changing tactics the malware authors are employing. The attack takes advantage of the functionality in Google Reader that allows users to share content with other users. The company said that it has seen about 1,300 Google reader accounts hosting the malicious URLs that point to the fake YouTube video that has been an integral part of the attack since its appearance last year.
Source: https://threatpost.com/google-reader-used-koobface-attack-111009/73066/