Troj/Bdoor-ALL is a backdoor and keylogging Trojan for the Windows platform.

When Troj/Bdoor-ALL is installed the following file is created:

System\help.dll - also detected as Troj/Bdoor-ALL

The file help.dll is registered as a new service named "BITS." Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\BITS

The file help.dll is registered as a service named "BITS" (replacing any existing services named "BITS"). Registry entries are created or modified under:

HKLM\SYSTEM\CurrentControlSet\Services\BITS

More information can be found at this Sophos page.