Question

What is the term used when a malicious party sends a fraudulent email disguised as being from a legitimate, trusted source?

Answer 1

Phishing is the term used when a malicious party sends a fraudulent email disguised as being from a legitimate, trusted source.

Answer 2

The "term" used to define fraudulent email by the malicious party claiming they are a "legitimate and trusted" source is phishing.

Hackers or the intruders send the emails that contain any fraudulent or untrusted emails that may even contain virus or malware that affects the system.

They disguise as if they are legitimate and trusted source. This is referred to as phishing.