Here's what Trojan autostart typically does:
1. Registry Manipulation: Trojans often modify the Windows Registry to add their malicious executable or code to the list of programs that are automatically executed during system startup. They create registry entries under the "Run" or "RunOnce" keys to ensure their execution each time the system boots.
2. Startup Folder Placement: Trojans may drop themselves or create shortcuts in the Windows Startup folder, which contains programs and scripts set to run automatically at system startup. Placing the Trojan in this folder ensures its execution every time the user logs in or starts the computer.
3. Task Scheduler Manipulation: Some Trojans can add tasks or modify existing tasks in the Windows Task Scheduler. They create scheduled tasks to execute their payload or trigger specific malicious activities at predetermined intervals or events, such as user logon or system boot.
4. Service Installation: Advanced Trojans may install themselves as Windows services to achieve autostart capabilities. Services are programs that run in the background and are independent of user interaction. By installing as a service, the Trojan gains persistence and evades detection since services typically have higher privileges and are less noticeable.
5. Browser Manipulation: Browser-specific Trojans target web browsers and modify their settings or extensions to achieve autostart. They may inject malicious code or modify browser shortcuts to ensure they execute whenever the browser opens.
By employing autostart techniques, Trojans can establish a foothold in the system and carry out various malicious activities, including data theft, password harvesting, remote access, or downloading and executing additional malware. Their persistence makes them difficult to detect and remove, as they can often evade traditional antivirus software scans and hide within legitimate system processes.
