rundll32.exe

Dear Osamu,

Thank you for posting your question on our forum.

It's important to understand that rundll32.exe itself is not a virus or trojan. It's a legitimate Windows system file responsible for running functions stored in DLL files. However, malicious actors can exploit it to execute harmful code.

Here's how to approach the situation:

1. Verify rundll32.exe legitimacy:

• Location: Check the file location. Legitimate rundll32.exe resides in C:\Windows\System32. If it's elsewhere, it might be malware.
• Digital signature: Right-click rundll32.exe, go to "Properties," and check the "Digital Signatures" tab. A valid Microsoft signature indicates legitimacy.

2. Scan your system:

• Run a full system scan with your antivirus or a reputable third-party scanner. To run a malware scan you can try Auslogics Anti-Malware: https://www.auslogics.com/en/software/anti-malware. Note: The program is designed to complement your main antivirus.

3. Analyze suspicious activity:

• If scans find nothing but you still suspect issues, monitor rundll32.exe activity using Task Manager's "Command Line" column. Look for unusual paths or file names linked to rundll32.exe.
• Consider process analysis tools like Process Explorer for deeper insights.

4. Remove identified threats:

• Follow your antivirus or scanner's instructions for removing detected threats.
• If manual removal is necessary, proceed with caution and consult resources or professionals to avoid damaging legitimate system files.

5. Check Startup Programs:

• Launch Auslogics BoostSpeed.
• Navigate to "All Tools" and click on "Startup Manager."

Review the list and toggle switches to enable or disable startup programs. Apply changes and reboot if needed.

6. Prevent future infections:

• Keep your antivirus and operating system updated.
• Practice safe browsing habits and avoid suspicious downloads/clicks.
• Consider a firewall for added protection.

Remember, removing rundll32.exe itself is highly inadvisable as it's crucial for Windows functionality. Focus on identifying and removing any malicious code exploiting it.

Should you have other questions or need further assistance, please do not hesitate to contact us.