Downloader.MDW was ranked number one in June's 10 most virulent malicious codes rating.
Information on AIDS is being spread via a new USB worm.
The increasing use of stealth programs highlights how keen Internet criminals are for their creations to go undetected.
Symantec raises eyebrow at Microsoft's new security offerings.
Spam accounted for up to 90% of all global e-mail in the first quarter of 2007.
Spyware and Trojans remain at the top of Panda Software's threat list for March.
Spyware and Trojans featured high on the malware hit parade in February.
PCs that appear to be functioning normally may be lulling users into a false sense of security.
Reactive technologies are no longer enough to block malware, says Panda Software.
In this World Wide Wrap: Trend Micro protects small businesses, attackers prey on Word 2000 flaw, and 94% of all e-mail in December was spam.
A Trojan downloader is "spreading extremely fast and evading detection".
In this World Wide Wrap: US tops security threat list again, Storm Trojan worst outbreak since 2005, and security companies align to support Vista.
In this World Wide Wrap: Are viruses and malware winning the security battle?, phishing and ID theft increase dramatically, and Deloitte makes 2007 security predictions.