Hi,
what WIN do you have ?
Where exactly was the infected File found (full pathname and filename) ?
test the file with OnlineScanners e.g. from TrendMicro & Kaspersky to get a more specific name
-remove the Virus/Malware and it's system modifications according to VirusInfos from Avast, VGREP (see below), TrendMicro or Kaspersky;
general removal procedure:
- kill respective Backdoor/Trojan process with task manager
- search for the file/process names in the registry; remove the malware's startup entries in the registry
- delete the file (maybe only possible after a reboot)
-Secure your system (change passwords, secure shares, install patches/updates for WIN, IE etc..)
-scan your whole system with updated avast and maybe a 2nd scanner ,e.g. TrendMicro to check whether your PC is clean
P.S.: Links to Info and removal procedure on "Backdoor-sdbot":
If found by Avast:
VGREP1if found by Norton:
VGREP2