Troj/Bckdr-ZLB is a backdoor Trojan for the Windows platform, which allows a remote intruder to gain access and control over the computer.

Troj/Bckdr-ZLB copies itself to "\drivers\own\".
Troj/Bckdr-ZLB creates rdisk.dll and skeys.dll.

Troj/Bckdr-ZLB creates registry entries.

More information can be found at this Sophos page.