Windows security malware scan did not remove all of Win32/Conteban.A!ml. What to do next?

When Microsoft Defender reports Win32/Conteban.A!ml as only partially removed, it means some components of the malware are still present and may continue to affect the system.

Take these steps next:

1. Run the Malicious Software Removal Tool (MSRT) full scan
   This tool can help clean difficult malware that Defender only partially removed.
   1. Press Windows logo key + R to open the Run dialog.
   2. Type **%windir%\system32\mrt.exe** and select OK.
   3. If prompted to allow the program to make changes, select Yes.
   4. Follow the prompts and choose a Full scan, then let it complete and remove anything it finds.
2. Restart and install the latest Windows updates
   After MSRT finishes:
   1. Restart the PC.
   2. Go to Settings > Update & Security > Windows Update and install all available updates. This ensures the latest security fixes and Defender components are in place.
3. Run Microsoft Defender Offline scan
   If the threat keeps coming back or Defender still reports components of Win32/Conteban.A!ml:
   1. Save any open work.
   2. Select Start > Settings > Update & Security > Windows Security > Virus & threat protection.
   3. Under Current threats, select Scan options.
   4. Choose Windows Defender Offline scan and select Scan now.
      The PC will restart and run a scan outside of Windows, which can detect and remove hidden components that reload at startup.
4. Ensure Defender protection features are fully enabled and updated
   1. Open Windows Security > Virus & threat protection.
   2. Under Virus & threat protection settings, select Manage settings.
   3. Make sure Cloud-delivered protection and Automatic sample submission are turned On.
   4. Under Virus & threat protection updates, select Check for updates, then under Threat definitions select Check for updates to get the latest definitions.
5. If components are still detected
   If Defender continues to detect Win32/Conteban.A!ml or suspicious files that are not fully removed:
   • Submit the remaining files to Microsoft for analysis using the file submission process so updated definitions can be created.
   • If malware has caused irreversible system changes (persistent errors, instability), consider using Windows Reset/Recovery options (preferably Keep my files) after backing up important data, then reinstall updates and security software.

References:

• Antivirus and antimalware software: FAQ
• Troubleshoot problems with detecting and removing malware
• Microsoft resources and guidance for removal of malware and viruses