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

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

Here are the steps that explain the process:

1. The malicious party, also known as the attacker, decides on the trusted source they want to impersonate. This could be a bank, a service provider like PayPal, or a social media site like Facebook.

2. The attacker then crafts an email that closely resembles an official email from the trusted source. This email will usually contain a call to action that requires the recipient to click on a link or download an attachment.

3. The link or attachment will typically lead to a fake website that looks identical to the real one, where the recipient is asked to input sensitive information such as usernames, passwords, or credit card details.

4. If the recipient falls for the scam and inputs their information, the attacker can then use this information for malicious purposes, such as stealing money or identities.

This type of scam is called "Phishing" because the attacker is essentially "fishing" for sensitive information. It's a serious issue that affects millions of people worldwide, and everyone should be aware of it to protect themselves online.