A remote administration tool (RAT) that bypasses the security features of a program, computer or network to give unauthorized access or control to its user.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
If the infection is in a local network, please follow the instructions on this webpage:
After disinfection it is recommended to change all log-in credentials, as they could have been compromised by the password stealer component of the worm. It is also recommended to check infected systems and networks for possible hacker intrusion that could have been performed through the backdoor component of the worm.
More details about the removing procedure you can find in our support center: http://www.f-secure.com/support/technical/av5/support-issue-2002100200.htm
Backdoor:W32/Bugbear.K (also known as Tanatos) is an email and network worm that also has a backdoor component. This particular variant is very similar to the original Tanatos worm that was found in 2002.
This Tanatos worm variant spreads in email messages with the following characteristics:
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