File masquerading is a cybersecurity technique where malicious software or files are disguised to appear as legitimate or harmless files. Attackers use this method to evade detection by security systems and to trick users into opening or executing the malicious file. Common tactics include changing file names, icons, or extensions to mimic trusted files, such as using 'invoice.pdf.exe' to appear as a PDF document. File masquerading is often used in phishing attacks, malware distribution, and social engineering schemes. Detecting such threats requires a combination of user awareness, robust endpoint protection, and advanced threat detection tools that can analyze file behavior and attributes beyond superficial appearances.