Attachment deception is a social-engineering technique that makes a malicious file appear safe, routine, or unrelated to its true purpose. Attackers may disguise an executable as a document, hide a script behind a familiar filename, or use double extensions and misleading icons to trick a user into opening it. The goal is not to break software, but to exploit trust in email, chat, and file-sharing workflows.
In cyber security, attachment deception matters because the first click can hand malware an execution path. Once opened, a disguised script or attachment may launch payloads, steal data, or trigger further spam and propagation. Defenses focus on blocking unsafe attachment types, stripping active content, showing full file extensions, scanning files at the mail gateway, and training users to verify unexpected files even when they seem to come from trusted contacts. It is a common pattern in phishing, worm delivery, and business email compromise.