SANS Internet Storm Center

Yellow fliers on vehicles in a parking lot. It's not your typical phishing scam, but cybercriminals are getting more creative in a down economy.

The fliers sit atop windshields and claim the vehicle is in violation of parking regulations. The fake pamphlet points the vehicle's owner to a Web site to get more information and pictures about the offense.

The SANS Internet Storm Center on Monday issued a warning to CEOs: don't be fooled by fake federal subpoenas sent by e-mail. The fake e-mails are part of a phishing attack targeting CEOs of some companies. Such targeted attacks are widely known as spear-phishing attacks.