331f28db.dll in Program Files\norton systemworks\norton antivirus\quarantine\ wininv.dll in Windows\system32\
Remove the following files
backdoor.prorat.16.exe, backdoor.prorat.16_(11).exe, backdoor.prorat.16_(2).exe, mutlaka_okuyun.txt, version_renewal_and_arrangements.txt, versiyon_yenilikleri.txt. 331f28db.dll in Program Files\norton systemworks\norton antivirus\quarantine\ wininv.dll in Windows\system32\