Malware
Backdoor
In Turkish: Arka kapı (backdoor)
A hidden way into a device or account that skips the normal login, left by malware or by a careless setup.
After breaking in once, an attacker may leave a backdoor so they can come back later, even if you change your password. Some devices ship with a default login that works as an open door until you change it.
This is why a clean-up after a break-in should also include checking sign-in sessions, linked apps and new accounts, not only changing one password.
What to do
- Change default passwords on every new device.
- After a suspected break-in, sign out of all sessions and review connected apps.
- Remove accounts or remote-access tools you did not create.