When a site gets compromised, the attackers will often leave some piece of malware behind to allow them access back to the site. Hackers want to leave a door open to retain control of the website and to reinfect it continuously. This type of malware is called a backdoor.

What Are Backdoors?

Backdoors are types of malware that allow for remote control of a compromised website by bypassing appropriate authentication methods.

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Via Sucuri.net