This detection rule analyzes inbound email communications that appear to originate from Intuit domains while masquerading as messages from DocuSign. It focuses on identifying fraudulent sender addresses that fail SPF (Sender Policy Framework) or DMARC (Domain-based Message Authentication, Reporting & Conformance) verification attempts, which indicates the potential for spoofing. The rule applies filters ensuring that the subject line or the display name of the sender includes references to 'DocuSign', reinforcing the impersonation of legitimate DocuSign communications. This makes it particularly relevant in counteracting credential phishing attacks where adversaries impersonate trusted brands to deceive recipients.