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updated 5/23/2011 4:20:32 PM ET 2011-05-23T20:20:32

Tricky online thieves are currently reworking Google's search results to tell you what your money is worth, and then take it from you.

Suspicious Web pages have been finding their way into the search results when users enter a sum they'd like to convert to another currency, researchers at the security firm Sophos reported.

For example: a Sophos employee entered "215 Euro to USD," and, in addition to several legitimate currency conversion websites, received a slew of malicious Web pages with keywords including "dirty sexist jokes."

These fraudulent sites, Sophos said, contain Trojans that can silently drop a harmful payload onto your computer and open you up to any number of damaging Trojan-based cybercrimes, including online bank account theft.

This scam tactic, in which cybercriminals rig search engines to rank their impostor Web pages high in the results for a particular topic, is called poisoned SEO. It's often deployed when criminals know a high-profile topic is bound to draw lots of Web traffic, such as last month's royal wedding. In this case, anybody traveling internationally is a potential victim.

Google has several features in place to protect Web surfers from poisoned pages, and several security companies offer plug-ins designed to weed out rigged Web pages.

As always, if you come across a search result that looks suspicious, don't click on it.

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