Researchers from the cybersecurity firm ESET have discovered a "highly targeted" piece of malware called Georbot that exploits a PC's remote-access capabilities to steal data and transmit it back to hackers. The malware -- which originated in Eastern Europe and has been in circulation since 2010 -- is one of two new security threats troubling experts. Kaspersky recently uncovered a similar "fileless" bot that infects memory directly by luring users to a website that has a Java exploit.

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