Do you have MBAM (Malwarebytes) on your machine? If so, update first and run a scan. If you do not have it:
Check your computer for malware with Malwarebytes’ Anti-Malware (MBAM).
· Download freehttp://www.malwarebytes.org/ (the blue button) for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click update so you have latest database before scanning.
· Under Settings:
o General: Automatically Save File After Scan Completes is checked off
o Scanner Settings: Check all boxes
o Updater: Download and install update if available is checked off
· Once the program has loaded, select “Perform Quick Scan”, then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the “remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
· Copy & Paste the entire report in your next reply.
If the virus is in your Avast Chest, you can also upload it to Avast.
That setting often give some mysterious results, usually it is malware signaturs from other security programs installed that is detected
so why it detect this i do not know
If you run the normal quick/full scan with default settings, any detection then?
That is because the memory scan incorporated into the Quick and Full scans doesn’t go into the same depth/sensitivity.
Personally I haven’t seen a reason to run a custom scan when the Quick and Full pre-defined scans should be adequate. But if doing a custom scan I wouldn’t select the memory scan.
With a resident on-access antivirus like avast, the need for frequent on-demand scans is much depreciated. For the most part the on-demand scan is going to be scanning files that would be otherwise be dormant or inert. If they were active files then the on-access file system shield would be scanning them before being created, modified, opened or executed.
I have avast set to do a scheduled weekly Quick scan, set at a time and day that I know the computer will be on.