A backdoor is a type of cybersecurity threat that allows attackers to secretly compromise a system and conduct malicious activities, such as stealing data and modifying files. Backdoors can be difficult to detect, as they often use legitimate system applications to evade defense mechanisms. Threat actors often utilize special malware, such as PlugX, to establish backdoors on target devices.

Havoc is an advanced post-exploitation framework used by hackers to take control of a system once they've breached it. With Havoc, attackers can run commands remotely, inject malicious processes, and access sensitive data. It's often used in targeted attacks, allowing cybercriminals to stay hidden in a network while stealing information or launching further attacks. Its flexibility and ability to bypass detection make it a serious threat, especially in environments that rely on traditional security tools.

Sliver is an open-source command-and-control (C2) framework that has been increasingly adopted by threat actors as an alternative to tools like Cobalt Strike. Developed by security firm Bishop Fox, Sliver was initially intended for legitimate security testing and red teaming exercises. However, its robust features and open-source nature have made it attractive to malicious actors seeking to control compromised systems.