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Published Jul 14, 2009 | Updated Sep 15, 2017


Detected with Windows Defender Antivirus

Aliases: Win-Trojan/Bifrose.491520.F (AhnLab) Bifrose.AKPM (Norman) Backdoor.Win32.Bifrose.psb (Kaspersky) BackDoor-CEP (McAfee)


Backdoor:Win32/Bifrose.EO is a generic detection for a trojan that may drop other backdoor trojans. It disables the Windows Firewall without the user's knowledge to allow its dropped trojans to connect to remote attackers.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as the Microsoft Safety Scanner ( For more information, see
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