how to fix Trojan:Win32/ClicFix.PJ!MTB

Hi sunilkollabathini,

Thanks for checking this further. Trojan:Win32/ClickFix.PJ!MTB is a Defender-detected threat tied to ClickFix-style social engineering, where a user may be tricked into running a command or installing something unsafe, and Microsoft notes that remnant files or changes can sometimes remain after the initial detection.

Here are a few additional checks you can try that go beyond the steps already mentioned by Q&A Assist:

1, Scan the original download location or suspicious file directly

• If you know where the alert came from (for example Downloads, Desktop, or a ZIP file), right-click that file or folder and select Scan with Microsoft Defender.
• Here are the references for further investigation: Microsoft resources and guidance for removal of malware and viruses; Scan an item with Windows Security; Troubleshoot problems with detecting and removing malware

2, Review recent browser extensions and unknown apps

• If you recently installed a new extension, “fix” tool, or anything prompted by a website, remove it and restart the browser.
• Microsoft’s ClickFix guidance shows these campaigns commonly rely on fake prompts, pasted commands, or malicious browser components.

3, Change important passwords from a clean device

• If you signed in to email, banking, or Microsoft accounts after the alert appeared, it would be a good precaution to change those passwords from a known-clean device.
• Microsoft notes that ClickFix campaigns can lead to information theft or data exfiltration.

References for more details: New Clickfix variant ‘CrashFix’ deploying Python Remote Access Trojan; Think before you Click(Fix): Analyzing the ClickFix social engineering technique

If the threat keeps reappearing after these checks, please share whether the detection points to a specific file path, browser download, or archive, and I can help narrow down the next step more precisely.

Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

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Trojan:Win32/ClicFix.PJ!MTB is handled by Microsoft Defender, but additional steps can help ensure the device is fully clean and hardened.

1. Confirm Defender remediation and run additional scans

• Open Windows Security → Virus & threat protection and review Protection history to confirm that the Trojan was quarantined or removed.
• Run the built-in Malicious Software Removal Tool for a deeper check:
  1. Press Windows key + R.
  2. Type %windir%\system32\mrt.exe and select OK.
  3. If prompted, allow the app to make changes.
  4. Choose a Full scan and complete the wizard.
• After the scan, restart the PC.

2. Install the latest Windows updates Malware can exploit known vulnerabilities. After cleaning:

• Manually install the latest Windows updates as described in the Windows update article referenced in the antivirus FAQ.

3. Use Microsoft Defender Offline if the threat keeps reappearing If Defender keeps detecting the same Trojan or related components:
4. Go to Start → Settings → Update & Security → Windows Security → Virus & threat protection.
5. Under Current threats, select Scan options.
6. Select Windows Defender Offline scan → Scan now.
7. The PC will restart and run an offline scan to detect hidden or persistent malware.
8. Handle detections that cannot be fully remediated If Defender reports that a detected threat cannot be remediated (for example, inside a .zip or on a network share):
9. If the threat is in a compressed archive, browse to that file and either delete it or right‑click → Scan with Windows Defender and then choose the recommended action.
10. If the threat is on a network share, open the share, right‑click the file → Scan with Windows Defender, and act on any detections.
11. If unsure of the file’s origin, run another full scan on the PC.
12. Address “partially removed” or manual‑steps‑required cases If Defender reports the threat as partially removed or indicates that manual steps are required:

• “Partially removed” means some but not all malicious components were cleaned. In that case:
  • Run the Malicious Software Removal Tool as above.
  • Restart the PC and install the latest updates.
  • If needed, follow the advanced troubleshooting guidance and use Microsoft Defender Offline.
• If Defender shows an error like ERR_MP_MANUAL_STEPS_REQUIRED, follow the threat‑specific manual remediation steps in the Microsoft Malware Protection Encyclopedia (linked from Defender’s event history).

6. If malware caused irreversible changes If system behavior remains abnormal or Defender/Windows reports that malware caused irreversible changes:
7. Back up important files to an external location (for example, OneDrive or an external drive). Prefer backups created before the infection.
8. Use Windows recovery options to reset, restore, or reinstall Windows 10/11, as described in the recovery documentation.
9. After reinstall/reset, immediately:
   • Apply all Windows updates.
   • Reinstall applications from trusted sources only.
   • Restore files from clean backups.
10. Prevent reinfection and harden the system

• Avoid websites that might contain malware, such as illegal download sites.
• Use a modern browser like Microsoft Edge with Microsoft Defender SmartScreen enabled to block malicious or low‑reputation sites.
• Keep Windows and all applications up to date using Windows Update and vendor update mechanisms.

These steps help verify that Trojan:Win32/ClicFix.PJ!MTB and any related components are removed, reduce the chance of persistence, and harden the device against future attacks.

References:

• Antivirus and antimalware software: FAQ
• Troubleshoot problems with detecting and removing malware
• Review event logs and error codes to troubleshoot issues with Microsoft Defender Antivirus
• Configure remediation for Microsoft Defender Antivirus detections
• Troubleshoot Windows Defender or Endpoint Protection client