The rule identifies modifications to anti-phishing rules in Microsoft 365 to enhance detection and prevention capabilities against phishing attacks. Anti-phishing rules are essential for detecting and preventing potential phishing threats, and adversaries may attempt to modify or disable these rules to facilitate attacks. This detection rule specifically monitors for changes such as 'Remove-AntiPhishRule' or 'Disable-AntiPhishRule' with a successful outcome. False positives can occur due to legitimate administrative actions or third-party tool interactions. The rule also outlines investigation steps, including reviewing event logs for specific actions related to anti-phishing rule modifications and assessing user activity associated with these changes. The response strategy includes isolating affected accounts, reverting unauthorized rule modifications, and enhancing security controls to prevent future incidents.