This category includes sites that provide or promote information gathering or tracking that is unknown to, or done without the explicit consent of, the end user or the organization, including sites that carry malicious executables or viruses, third party monitoring, and other unsolicited commercial software, spyware, and malware "phone home" destinations.

Note The technical definition of Spyware used for this category may not exactly match the definition used elsewhere by Sophos. This category focuses on filtering malicious and tracking content, not simply adware and cookies. For non-malicious adware filtering, please block the Advertisements and Pop-ups category.