This article points out currently known issues and limitations related to F-Secure Online Scanner.
When Online Scanner scans files and memory, it queries the file reputation system located in the Cloud. To be able to do that, Online Scanner needs a network connection with Internet access.
Online Scanner needs admin privileges to scan system memory and files.
When Online Scanner scans system files, it opens them one by one. These read operations can be interrupted by existing antivirus software installed in the system, and if the files are found infected, the antivirus software blocks and removes them before Online Scanner. In such cases, Online Scanner reports that no infection was found although the infection itself is successfully removed.
HKCU\Software\Microsoft\Windows\CurrentVersion\Run pointing to c:\windows\eicar.com
After that, Online Scanner finds Eicar as a system-wide infection.
When User Access Control is off (the lowest position of the slider in the UAC Settings dialog), a non-admin user cannot perform a scan at all even if they run it as an administrator. Online Scanner terminates the scan and shows an error. To make it running, set UAC on.
Online Scanner cannot be run in Windows Rescue mode or Rescue mode with networking.
If ASUS AI Suite 3 is running when Online Scanner scans the memory, the system may freeze. To workaround the issue, stop ASUS AI Suite 3 for the time of the scan.