This detection rule identifies attempts to disable the runtime scanning feature for macros in Microsoft Office applications by monitoring changes to the `MacroRuntimeScanScope` registry key under `SOFTWARE\Microsoft\Office\Common\Security`. The key must be set to `DWORD (0x00000000)` to disable the scanning functionality, which is critical for preventing the execution of malicious VBA macros. The rule is particularly relevant for environments that rely on the integrity of macro scanning as an additional layer of security against macro-based attacks. The detection logic inspects registry changes and triggers alerts when the specified conditions are met, indicating possible tampering with this security feature. Given that macros can be leveraged by attackers to execute malicious code, maintaining vigilance against such alterations is important for overall cybersecurity posture. The rule is labeled with a high severity level, reflecting its importance in safeguarding systems from potential attacks that exploit macro vulnerabilities. This detection mechanism is especially useful for organizations utilizing Microsoft Office applications as part of their operations, where macros are commonly used but can also pose significant risks if exploited by cyber adversaries. The author, Nasreddine Bencherchali, has provided extensive references to Microsoft documentation and community resources regarding macro vulnerabilities, illustrating the rule's basis in current security concerns related to Office applications.