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When DKIM signature verification fails, what is the most likely technical cause?
DKIM uses a cryptographic signature over specified headers and the message body. If the body is modified in transit, the hash computed by the receiver will not match the signature, causing verification to fail. This is the most likely technical cause of DKIM failure.
An organization uses Microsoft 365. Which feature should an admin use to globally remove a malicious phishing email from all user mailboxes?
Search and Purge in Microsoft 365 Defender (formerly Office 365 Advanced Threat Protection) allows administrators to search for and delete malicious emails from all user mailboxes. This feature is designed specifically for incident response to remove phishing or malware emails gl…Read full explanation
You are analyzing an email with a suspicious attachment. You notice the file name is 'invoice.pdf.exe'. What does this indicate?
A filename like 'invoice.pdf.exe' uses a double extension to disguise an executable as a PDF. Windows hides known file extensions by default, so the file may appear as 'invoice.pdf' to the user, but it actually runs as an .exe. This is a classic social-engineering technique to tr…Read full explanation
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