Windows Defender has failed to quarantine Trojan:JS/Nemucod!pz.

Question

Windows Defender on my Desktop pc (Windows 11 Pro) has failed to quarantine Trojan:JS/Nemucod!pz.What should I do?

Answer 1

If Windows Defender has failed to quarantine the Trojan:JS/Nemucod!pz, you can take the following steps:

1. Check for Updates: Ensure that your Windows Defender is up to date. Sometimes, updates include new definitions that can help in detecting and managing threats more effectively.
2. Run a Full Scan: Perform a full system scan using Windows Defender. This can help identify and potentially remove the Trojan if it is still present.
3. Use the Clean Option: If the scan detects the Trojan, you can choose to remove it directly instead of quarantining it. This action will permanently delete the malicious software from your system.
4. Manual Removal: If Windows Defender continues to fail to quarantine or remove the Trojan, you may need to manually delete the infected files. Be cautious and ensure that you are not deleting essential system files.
5. Use Additional Security Tools: Consider using additional malware removal tools, such as the Microsoft Safety Scanner, to help detect and remove the Trojan.
6. Review Event Logs: If you encounter issues during the process, you can review the event logs for any error codes or messages that might indicate what went wrong. For example, Event ID 1118 indicates that an action to protect your system failed, which might provide insight into the issue.
7. Seek Professional Help: If you are unable to resolve the issue, it may be beneficial to consult with a professional or your IT department for further assistance.

Make sure to back up important data before taking any actions that involve deleting files or making significant changes to your system.

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References:

• Endpoint Protection client frequently asked questions
• Review event logs and error codes to troubleshoot issues with Microsoft Defender Antivirus