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TDSS is a trojan that has a rootkit component and a bot component. The rootkit is responsible for hiding the trojan's files on disk, and for providing hidden and encrypted storage for the bot component. The bot component connects to remote computers and makes the infected computer part of a botnet. It may download and install additional malware.
If your anti virus is unable to remove it, scan with Malwarebytes free version.
http://www.malwarebytes.org/
Use the quick scan option.
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