Updating Windows to fix the EternalBlue vulnerability and prevent the DoublePulsar attack

Wi-Fi Inspector or Smart Scan in Avast Antivirus may detect that your PC is vulnerable or has been subjected to the DoublePulsar attack, which is used by WannaCry ransomware and other malicious threats. This means that your PC is running an outdated version of the Windows File and Printer Sharing service (SMB), which contains a vulnerability known as EternalBlue. This vulnerability can be resolved by installing the MS17-010 security update.

Install the MS17-010 security update

Follow the relevant steps below according to your version of Windows.

  1. Restart your PC.
  2. Click the Windows Start button, then select Settings (the gear icon).
  3. Go to Update & SecurityWindows Update, and click Check for updates.
  4. Install any available updates.
  5. Open the Avast user interface and run the Wi-Fi Inspector Scan (ProtectionWi-Fi Inspector) to confirm your PC is no longer vulnerable.
If you experience issues updating Windows, try the solutions below:

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  1. Click the relevant link below to download the Microsoft security update, then save it to your desktop:
  2. Disconnect your PC from the network by disconnecting the network cable or turning off WiFi, then restart your PC.
If the Double Pulsar exploit is already present, attempting these resolution steps without disconnecting from the network and restarting your PC could prevent your PC from starting.
  1. After your PC restarts, run the installer you saved to your desktop in step 1.
  2. Restart your PC again to complete the installation process.
  3. Reconnect to the network.
  4. Open the Avast user interface and run the Wi-Fi Inspector Scan (ProtectionWi-Fi Inspector) to confirm your PC is no longer vulnerable.
If the above troubleshooting steps do not work, try the following alternative solution:
  • Restart your PC and go to Windows Updates (Charms menu ▸ Settings ▸ Change PC settings ▸ Windows Update ▸ Check for updates now). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  1. Click the link below to download the Microsoft security update, then save it to your desktop:
  2. Disconnect your PC from the network by disconnecting the network cable or turning off WiFi, then restart your PC.
If the Double Pulsar exploit is already present, attempting these resolution steps without disconnecting from the network and restarting your PC could prevent your PC from starting.
  1. After your PC restarts, run the installer you saved to your desktop in step 1.
  2. Restart your PC again to complete the installation process.
  3. Reconnect to the network.
  4. Open the Avast user interface and run the Wi-Fi Inspector Scan (ProtectionWi-Fi Inspector) to confirm your PC is no longer vulnerable.
If the above troubleshooting steps do not work, try the following alternative solution:
  • Restart your PC and go to Windows Updates (Start menu ▸ Control Panel ▸ System & Security ▸ Windows Update ▸ Check for updates). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.

If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:

  • Avast Premium Security 19.x
  • Avast Free Antivirus 19.x
  • Avast Omni 1.x
  • Avast Premier 19.x
  • Avast Internet Security 19.x
  • Avast Pro Antivirus 19.x
  • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
  • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit

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