A sophisticated computer worm spreading via AOL Instant Messenger (AIM) is setting up a botnet that may be difficult to combat...The worm, known as W32.pipeline, propagates when AIM users click on a web link that appears to have been sent to them by someone on their buddy list. They receive a message along the lines of, "Hey, would it be okay if I upload this picture of you to my blog?" If the recipient clicks on the link, an executable file that looks like a Jpeg will download into a Windows folder,...The file can then execute a number of different attacks...