This detection rule is designed to identify instances where the Sysmon service has encountered an error, specifically when an application popup is triggered to report a failure. The rule focuses on Event ID 26, which indicates an application error for the Sysmon executables 'sysmon64.exe' and 'sysmon.exe'. The detection mechanism relies on monitoring for the 'Application Popup' provider, indicating a critical failure in Sysmon operations that could signify deeper issues or evasion techniques being utilized in the environment. By flagging these events, security teams can respond proactively to potential malicious activities or complications with system monitoring tools.