Attacks and malware
What is Backdoor?
A hidden way into a system that bypasses normal authentication, left by an attacker or built in, so access can be regained at will.
A backdoor is a hidden way into a system that skips the normal login process. Attackers install them so they can come back whenever they want, even after the original entry point is closed.
Backdoors can be malware implants, web shells, extra user accounts, modified login components or legitimate remote tools configured by the intruder. A backdoor can also be inserted into software before it reaches customers, which is what makes supply chain attacks so damaging.