This rule detects instances in which an Okta user session is initiated while the user is operating behind an anonymising proxy service. Anonymising proxies can conceal user IP addresses, presenting a potential risk as they may hide malicious activities or unauthorized access attempts. The detection mechanism utilizes the Okta system log to identify events of type 'user.session.start' that are associated with a security context where an anonymising proxy is being utilized. Such environments raise alarm bells for possible session hijacking or other forms of defense evasion tactics. The rule aims to provide a heightened security posture by alerting security teams to scrutinize these sessions, as they may represent attempts to bypass security protocols or originate from compromised credentials. False positives may occur in scenarios where users have legitimate reasons to access services through an anonymising proxy.