The detection rule titled 'Brand Impersonation: QuickBooks Notification From Intuit Themed Company Name' is designed to identify potential phishing attempts that involve emails disguised as legitimate notifications from QuickBooks and Intuit. The rule specifically targets messages where the sender’s email, headers, and content imply a false association with QuickBooks and Intuit, despite not being sent from their legitimate domains. This rule utilizes various criteria for detection: it checks that inbound emails pass SPF and DMARC authentication, thus ensuring they are not blatantly forged. It looks for any reply-to email headers that contain indications of the terms 'intuit' or 'quickbooks' but are not from the actual domains (intuit.com or quickbooks.com). Additionally, it inspects the HTML content of the email for specific classes within div or p tags that suggest the email is attempting to impersonate reputable brand formats. This combination of factors—authentication checks paired with content analysis—aims to mitigate risks of callback phishing, credential phishing, and business email compromise (BEC) through social engineering tactics.