Published Oct 26, 2007 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: Backdoor.Win32.Bifrose.acs (Kaspersky) BackDoor-CEP.svr (McAfee) W32/Smalldoor.ANQQ (Norman) Troj/Bifrose-UP (Sophos) (Sunbelt Software) Backdoor.Bifrose (Symantec) BKDR_SMALLDOO.BY (Trend Micro) Packed/NSPack (VirusBuster)


Backdoor:Win32/Bifrose.ACI is a backdoor Trojan that allows a remote attacker to access to the compromised computer, and injects its processes into the Windows shell and Internet Explorer.
To detect and remove this threat and other malicious software that may be installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following:
For more information on antivirus software, see
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