Malware Detection (Runtime Broker Issue)

Notes on Malware Detection (Runtime Broker Issue)

1. Context

The issue involves Runtime Broker (RuntimeBroker.exe) consuming high memory or causing performance problems in Windows.
This can sometimes be a symptom of malware infection masquerading as the legitimate Runtime Broker process.

2. Checking for Malware

Path Verification: The legitimate Runtime Broker process should be located at: C:\Windows\System32\RuntimeBroker.exe → If found elsewhere, it may be malicious or fake.
Secure Task Manager / Antivirus:
- Use a secure task manager or antivirus tool to inspect the process.
- Check for unusual CPU or memory usage, unknown publisher, or irregular digital signatures.
Run a Full System Scan:
- Use Windows Defender or a trusted third-party antivirus.
- Consider running an offline scan to detect hidden or persistent malware.

3. System File Checker (SFC)

Purpose: Detects and repairs corrupted or altered system files, including those modified by malware.
Command:
```
sfc /scannow
```
Run this command in Command Prompt (Admin).
If malware has altered system files, SFC can restore original versions from Windows cache.

4. Registry Editor Precaution

Sometimes malware or misconfigurations affect registry keys related to system processes.
Example Fix Path:
```
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TimeBroker
```
- Change Start value from 3 (manual) to 4 (disabled) to stop Runtime Broker from running automatically.
⚠️ Warning: Editing the registry incorrectly can cause serious issues. Always back up the registry before making changes:
- Microsoft guide: “How to back up and restore the registry in Windows.”

5. General Malware Detection Tips

If Runtime Broker behaves abnormally:

Last updated 28 days ago

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