Looks like those anti-phishing filters in your browser are working because attackers are now bypassing them by stuffing HTML files into spam messages so the malicious pages don't get detected: Researchers have detected several cases of phishers passing HTML file attachments off as Bank of America, Lloyds, TSB, and PayPal pages.
And this practice appears to be on the rise, says Satnam Narang, a threat analyst with M86 Security, which has seen an increasing number of these types of phishing messages in its spam traps. "We've seen malicious HTML attachments in spam before that directed to Canadian pharmacies. On more than one occasion, we've seen it with PayPal and Bank of America," Narang says. "But the fact is that these are becoming more common."

Unlike spam emails that try to direct users to a phishing site via a URL, this one is able to bypass the browser's anti-phishing filter and blacklist by locally storing the page. "And once the user inputs his information and sends it off to a PHP script on a legitimate website, it gets redirected to the bad guys, and they get the information," he says. "The user is none the wiser because it redirects [him] to actual sites," such as PayPal, for instance.

The link for this article located at Dark Reading is no longer available.