Troj/Bckdr-QMZ is a Trojan for the Windows platform.

When Troj/Bckdr-QMZ is installed the following files are created:

(Program Files)\Internet Explorer\dnsw\lexplore.exe, which is detected as Mal/Heuri-E.
(Program Files)\Internet Explorer\dnsw\r_s.exe, which is also detected as Troj/Bckdr-QMZ.
(Program Files)\Internet Explorer\dnsw\zlib.dll, which is clean file and can be safely removed.
(Program Files)\Messenger\msmsngr.exe, which is detected as Mal/Behav-034.
(System)\zlib.dll - clean, which is clean file and can be safely removed.


More information can be found at this Sophos page.