Every major corporation harbouring valuable information has been compromised, but only some know it, according to executives at McAfee and RSA.

Global banks are yet to solve a vulnerability in the Europay, Mastercard and Visa (EMV) integrated circuit standard first rolled out in 2003, allowing hackers to place Trojan devices on point of sale hardware to harvest user and credit card information.

Scammers are infecting computers with a Trojan horse program disguised as software that determines whether PCs are compatible with Windows 7.

Virus writers keep getting sneakier. In an effort to evade detection, they've begun hiding their command and control instructions in legitimate Web 2.0 sites such as Google Groups and Twitter.

Up to 40,000 Web sites have been hacked to redirect unwitting victims to another Web site that tries to infect PCs with malicious software, according to security vendor Websense.

Former Apple Macintosh evangelist Guy Kawasaki posts Twitter messages about a lot of different things, but the message he put up on Tuesday afternoon was really out of character.