The 'MOVEit Certificate Store Access Failure' detection rule is designed to identify potential exploitation attempts targeting the CVE-2024-5806 vulnerability in Progress MOVEit Transfer. This vulnerability may allow unauthorized impersonation of legitimate users through an authentication bypass. The rule operates by monitoring logs for exceptions indicating failed access to the certificate store, which is a critical component of secure user authentication. While such failures can stem from legitimate operational causes, a spike in these events—particularly from unusual or unexpected sources—can signal an active exploitation attempt. The rule helps security analysts rapidly discern malicious activities related to unauthorized access attempts and determine if further investigation is warranted.