What is a Backdoor Attack?

A Backdoor Attack is a type of cyber attack in which an attacker gains unauthorized access to a system, network, or device. This attack is carried out by bypassing a legitimate security process. Backdoors are often used when cybercriminals want to infiltrate a system and repeatedly return without any valid permission, allowing them to access important data or seize control of the system.

The process involves gaining initial access (through a vulnerability, phishing, etc.), creating the backdoor (a secret "door" that allows re-entry), exploiting the backdoor for repeated unauthorized access, and potentially taking full control of the system.

Operating System Backdoor: Exploits hidden processes or commands in the OS.

Application Backdoor: Exploits vulnerabilities in application software.

Hardware Backdoor: A backdoor installed in a device's hardware, which is very difficult to detect and remove.

Trojan Horse: Malware that infiltrates a user's system and installs a backdoor.

Objectives: Data theft, system takeover, cyber espionage, malware distribution, and launching DDoS attacks.

Security Measures: Keep software and OS updated, use antivirus software, use a firewall, use strong passwords, avoid suspicious emails and downloads, monitor network activity, and conduct regular security audits.