What are exploits and how are they delivered to the target device?

An exploit is a specialized program code, script, or sequence of commands that takes advantage of undocumented errors, bugs, or vulnerabilities in software to perform unauthorized actions on a victim's computer. The goal of such code can range from privilege escalation in the system to remote execution of arbitrary code, leading to the installation of full-fledged malware. Vulnerabilities can be found in operating systems, web browsers, office suites, archivers, and any other applications that process external data.

The delivery of exploits to the target device is carried out using various methods depending on the attack vector chosen by the attackers. One of the most common methods is malicious email attachments, such as specially crafted PDF files or Microsoft Office documents with embedded macros. When a user opens the file, the vulnerability in the viewer application is triggered, initiating a stealthy download of the payload from the internet without the computer owner's knowledge.

Another popular method is attacks via web browsers using so-called exploit kits. A user can infect their device simply by visiting a compromised or specially created website that automatically scans the system for outdated software and vulnerable plugins. To counteract such threats, it is critically important to install security updates in a timely manner for all used applications and operating systems, as well as to use modern browsers with isolated sandbox processes.