What is Backdoor?
It is a method or software that provides covert remote access to a system by bypassing standard authentication mechanisms.
Overview
A backdoor is a hidden entry point that can be intentionally left by software developers for debugging purposes or subsequently planted in the system by attackers. Through this method, traditional username, password, or encryption controls are disabled. Malicious actors who infiltrate the system undetected can operate with administrative privileges for a long time by using the backdoor.
How it works
Backdoors are established with a logic check hidden in the source code or a hidden network port left open on the system. Sometimes they are leaked into the supply chain through updates, and sometimes they are triggered by a small command-line tool dropped into the system using an exploit. When the attacker sends a special signal or key from the outside, the backdoor directly initiates a remote access session.
Where it is used
They are frequently seen in supply chain attacks, corporate espionage cases, and advanced persistent threat operations. They are also detected in firmware or malicious code leaked into open-source packages.
Commonly confused with
It can be confused with a Trojan. A Trojan is the deceptive shell used to deliver malware; whereas a backdoor is the function that provides persistent and covert access to the system.
Questions and answers
Why do developers put backdoors in a system?
In some cases, they are deliberately left for maintenance convenience or emergency access, but this leaves the system exposed to a major security risk.
How is a backdoor detected?
It can be caught through abnormal network traffic monitoring, file integrity checking, and in-depth static code analysis.
Related terms
This explanation was written in plain language for TreScout with AI and machine-translated from the Turkish original · the Turkish version prevails. If something looks wrong or missing, write to hello@trescout.com. Read in Turkish →