comptia-a-plus-core2/notes/SEC-6-malware-removal-process.md

# SEC-6: Malware Removal Process

Status: not started

Domain:
- 2.0 Security

Objective alignment:
- 2.6 Malware removal process

## What You Need To Know

The exam expects the malware removal process in order. Do not just know the steps individually; know what comes next.

Important idea:
- Full wipe/reimage from known-good media is the cleanest answer for severe malware.
- Remediation is sometimes done to recover data or restore enough function to continue business.

## Memory Trick

Use **I-Q-D-R-U-S-R-S-E-E**:

1. **I**nvestigate and verify symptoms
2. **Q**uarantine infected systems
3. **D**isable System Restore/System Protection
4. **R**emediate infected systems
5. **U**pdate anti-virus/anti-malware
6. **S**can and remove
7. **R**eimage/reinstall if needed
8. **S**chedule scans and run updates
9. **E**nable System Protection and create restore point
10. **E**ducate the end user

Short phrase:
- **Investigate, Quarantine, Disable, Remediate, Update, Scan, Reimage, Schedule, Enable, Educate.**

## Step 1: Investigate and Verify Symptoms

Look for:
- Odd error messages
- Fake security alerts
- Application failures
- Slow boot
- Slow applications
- Browser redirects
- Files encrypted/renamed/missing
- Unknown processes

Goal:
- Confirm there is a real problem before changing anything.

## Step 2: Quarantine Infected Systems

Actions:
- Disconnect from network.
- Disable Wi-Fi/Bluetooth if needed.
- Isolate removable media.
- Prevent file transfer from the infected system.

Goal:
- Stop spread.

## Step 3: Disable System Restore/System Protection

Why:
- Malware can hide in restore points.
- Restoring later could bring the infection back.

Exam clue:
- Disable before remediation, re-enable after cleanup.

## Step 4: Remediate Infected Systems

Actions:
- Remove/quarantine malicious files.
- Remove malicious startup entries.
- Remove suspicious apps/extensions.
- Repair changed settings.

Goal:
- Remove the infection or reduce damage.

## Step 5: Update Anti-Virus/Anti-Malware

Actions:
- Update signatures/definitions.
- Update scanning engine.
- If malware blocks updates, use a trusted clean system or offline media.

Goal:
- Make sure tools recognize current threats.

## Step 6: Scan and Remove

Techniques:
- Normal scan
- Safe Mode scan
- Offline/preinstallation environment scan
- Bootable rescue media

Goal:
- Detect and remove malware using updated tools.

## Step 7: Reimage/Reinstall If Needed

When:
- Rootkit/persistent infection.
- Cleanup fails.
- System integrity is not trusted.
- Time-sensitive business recovery needs a known-good image.

Goal:
- Return to a clean known-good state.

## Step 8: Schedule Scans and Run Updates

Actions:
- Enable scheduled scans.
- Enable automatic definition updates.
- Run OS updates.
- Run application updates.

Goal:
- Reduce reinfection risk.

## Step 9: Enable System Protection

Actions:
- Re-enable System Protection/System Restore.
- Create a clean restore point.

Goal:
- Restore recovery capability after the system is clean.

## Step 10: Educate The End User

Topics:
- Avoid suspicious links.
- Avoid unknown downloads.
- Report symptoms early.
- Validate pop-ups and security alerts.
- Use approved software sources.

Goal:
- Reduce repeat infection.

## Commands To Enter

Windows inspection commands:

```powershell
windowsdefender:
```

What it does:
- Opens Windows Security.

```powershell
taskmgr
```

What it does:
- Opens Task Manager for process/resource review.

```powershell
resmon
```

What it does:
- Opens Resource Monitor for detailed activity.

```powershell
rstrui.exe
```

What it does:
- Opens System Restore.
- For this lab, view only. Do not restore.

```powershell
SystemPropertiesProtection
```

What it does:
- Opens System Protection settings.
- For this lab, view only. Do not disable protection unless working a real guided incident.

```powershell
shutdown /r /o /t 0
```

What it does:
- Restarts into Advanced Startup options.
- This is how you can reach recovery tools.
- Do not run unless you are ready to reboot.

Linux/macOS comparison:

```bash
top
ps aux
```

What it does:
- Shows running processes and resource usage.

## Mini Lab

Goal:
- Practice the process order and safe inspection.

Windows:
1. Open Windows Security with `windowsdefender:`.
2. Open Task Manager with `taskmgr`.
3. Open Resource Monitor with `resmon`.
4. Open System Protection with `SystemPropertiesProtection`.
5. Do not disable System Protection during practice.
6. Record:
   - Defender status:
   - Highest CPU process:
   - System Protection state:
   - Where Advanced Startup is located:

Tabletop:
For each scenario, write the next step:

1. User reports fake antivirus pop-ups and slow performance.
2. You confirm malware symptoms.
3. The system is disconnected from the network.
4. System Restore is disabled.
5. Malicious files are removed.
6. Anti-malware signatures are updated.
7. Scan fails to remove a suspected rootkit.
8. Clean image is restored.
9. Updates and scheduled scans are configured.
10. Clean restore point is created.

## Quick Check Before Quiz

You are ready for the SEC-6 quiz when you can answer these without looking:
- What is step 1?
- What comes after verifying symptoms?
- When do you disable System Restore?
- When do you re-enable System Protection?
- Why educate the user?
- When should you reimage/reinstall?