A new e-mail worm, Sixem-A, is on the loose that preys on the intense worldwide interest in the football World Cup. It began circulating earlier this week, and has just recently been blocked by few antivirus vendors.

Victims receive messages with subjects like “Naked World Cup game set,” or “Soccer fans killed five teens,” and are encouraged to click on an e-mail attachment, which appears to be an image.

The attachment is actually a malicious software that disables anti-virus products, attempts to download more malware, and also forwards itself to e-mail addresses saved on the victim’s computer. Link

Any topic of widespread interest are targeted by virus / worm writers using traditional social engineering attacks.

Precaution: Never open attachments from unknown people. Never open attachments from known people if the email appears even slightly out of place or out of context. Verify with the sender to ensure that he has really sent you the attachment (and not some virus / worm invading his computer).