Core Shields are the main protection components in Avast Antivirus. The Core Shields are: File Shield, Behavior Shield, Web Shield, and Mail Shield. By default, all Core Shields are enabled to provide optional protection. Avast Antivirus shields actively analyze suspicious information both sent from and received to your PC, as well as potentially malicious content stored within your PC. These components detect and block malicious files, dangerous websites, unauthorized connections, and other threats.
Enable or Disable all Core Shields
Core Shields are your PC's main defense against malware. All shields are enabled by default for your protection, but all the shields can be disabled at once for troubleshooting purposes. To disable all Core Shields temporarily:
- Open the Avast user interface and go to
☰Menu ▸ Settings.
- Select Protection ▸ Core Shields.
- Click the slider so that it turns to red (OFF), and select the duration of time Core Shields will be disabled.
All Core Shields are now temporarily disabled. To enable all Core Shields, follow steps 1-2 above, then click the red slider so that it changes to green (ON).
Configure Core Shields sensitivity
In this section of the Core Shields settings, you can determine the sensitivity of the shields. The higher the sensitivity, the higher the protection and potential for false positive malware detections. Reducing the sensitivity reduces the chance of false positive detections, but may also reduce the effectiveness of the Core Shields. Sensitivity is set to Medium Sensitivity by default, but can also be set to High Sensitivity or Low Sensitivity. To change your Core Shields sensitivity:
- Click and hold the white marker, then slide it to your desired sensitivity setting.
Configure Core Shields behavior
In this section of the Core Shields settings, select the tab for Virus, Potentially unwanted programs (PUPs), or Archives, and define the actions to be performed when each type of virus is found on your PC. Configure the following behavior settings:
- Select action to be performed when a virus is found: this setting applies to Viruses, Potentially unwanted programs (PUPs), and Archived Viruses. We recommend selecting Fix automatically for all three types.
- Enable CyberCapture Technology: define how you want to treat a threat on your PC. You can select Always block a threat to allow Avast to block the threat automatically, or Ask me about decision to receive a notification every time a threat is detected on your PC.
- Enable Hardened Mode: uses information based on reputation services to determine which executable files are safe to open.
- Enable Rootkit detection: enables Avast to monitor hidden malicious threats in the system. Unticking this option may resolve potential compatibility issues that can cause system crashes.
- Enable Exploit detection: enables Avast to detect and block attempts to run malicious threats or processes in the memory from exploiting vulnerable applications on your PC. Unticking this option may result in potential compatibility issues that can cause system crashes.
Enable or disable an individual shield
- Avast Ultimate 19.1
- Avast Premier 19.1
- Avast Internet Security 19.1
- Avast Pro Antivirus 19.1
- Avast Free Antivirus 19.1
- 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