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 This means that your PC is running an outdated version of the Windows File and Printer Sharing service (SMB), which contains a vulnerability known as EternalBlue.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

  1. Restart your PC.
  2. Click the Windows Start button, then select Settings (the gear icon).
  3. Go to Update & SecurityWindows UpdateCheck for updates.
  4. Install any available updates.
  5. Open Avast Antivirus and go to ProtectionWi-Fi Inspector. Run a Wi-Fi Inspector scan to confirm that your PC is no longer vulnerable.

If the troubleshooting steps above do not work, try the other solutions below.

Other solutions

  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 removing the network cable or turning off Wi-Fi, then restart your PC.
    If the Double Pulsar exploit is already present, attempting to follow the steps below without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer that you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.
  6. Open Avast Antivirus and go to ProtectionWi-Fi Inspector. Run a Wi-Fi Inspector scan to confirm that your PC is no longer vulnerable.

If the troubleshooting steps above do not work, try the other solutions below.

Other solutions

  • Update Windows manually via Windows Update:
    1. Restart your PC.
    2. Press the Win key on your keyboard, then hover the cursor over the the - minus sign in the bottom-right corner of the screen to open the Windows menu options.
    3. Go to SettingsChange PC settingsWindows UpdateCheck for updates now.
    4. Run a Wi-Fi Inspector scan to confirm that 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 learn how to learn how to disable SMB1:
  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 removing the network cable or turning off Wi-Fi, then restart your PC.
    If the Double Pulsar exploit is already present, attempting to follow the steps below without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.
  6. Open Avast Antivirus and go to ProtectionWi-Fi Inspector. Run a Wi-Fi Inspector scan to confirm that your PC is no longer vulnerable.

If the troubleshooting steps above do not work, try the other solutions below.

Other solutions

  • Update Windows manually via Windows Update:
    1. Restart your PC.
    2. Click the Windows Start button and select Control Panel.
    3. Go to System & SecurityWindows UpdateCheck for updates.
    4. Run a Wi-Fi Inspector scan to confirm that 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 learn how to learn how to disable SMB1:

Although it is not possible to use the latest version of Avast Antivirus on Windows Vista, Wi-Fi Inspector may detect another vulnerable PC on your network that is running Windows Vista.

Follow the steps below on the vulnerable PC that is running Windows Vista:

  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 removing the network cable or turning off Wi-Fi, then restart your PC.
    If the Double Pulsar exploit is already present, attempting to follow the steps below without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.

Follow the steps below on the PC where Avast Antivirus is installed:

  1. Open Avast Antivirus and go to ProtectionWi-Fi Inspector.
  2. Run a Wi-Fi Inspector scan to confirm your other PC is no longer vulnerable.

If the troubleshooting steps above do not work, try the other solutions below.

Other solutions

Try the solutions below on the vulnerable PC that is running Windows Vista.

  • Update Windows manually via Windows Update:
    1. Restart your PC.
    2. Click the Windows Start button and select Control Panel.
    3. Go to SecuritySystem & SecurityWindows UpdateCheck for updates.
    4. On the PC where Avast Antivirus is installed, open Avast Antivirus and go to ProtectionWi-Fi Inspector. Run a Wi-Fi Inspector scan to confirm that your other 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 learn how to learn how to disable SMB1:

Although it is not possible to use the latest version of Avast Antivirus on Windows XP, Wi-Fi Inspector may detect another vulnerable PC on your network that is running Windows XP.

Follow the steps below on the vulnerable PC that is running Windows XP:

  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 removing the network cable or turning off Wi-Fi, then restart your PC.
    If the Double Pulsar exploit is already present, attempting to follow the steps below without disconnecting from the network and restarting your PC could prevent your PC from starting.
  3. After your PC restarts, run the installer you saved to your desktop in step 1.
  4. Restart your PC again to complete the installation process.
  5. Reconnect to the network.

Follow the steps below on the PC where Avast Antivirus is installed:

  1. Open Avast Antivirus and go to ProtectionWi-Fi Inspector.
  2. Run a Wi-Fi Inspector scan to confirm that your other 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 learn how to disable SMB1:

  • Avast Omni 21.x for Windows
  • Avast Premium Security 21.x for Windows
  • Avast Free Antivirus 21.x for Windows
  • 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 with Convenient Rollup Update, 32 / 64-bit
  • Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit
  • Microsoft Windows XP Home / Professional / Media Center Edition - Service Pack 3, 32-bit

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