PC World has an article about some new malware tricks. The lead sentence is right on the money:
If the crooks behind viruses, Trojan horses, and other malicious software were as stupid as they are scummy, we’d have a lot less to worry about.
Some of the tricks are pretty clever and interesting to read about. In the end, though, the defenses are the same as always: keep software up to date, use security software from a trusted source, and exercise caution when using your PC (or, even more so, others’ PCs).