A backdoor is a malware type that negates normal authentication procedures to access a system. As a result, remote access is granted to resources within an application, such as databases and file servers, giving perpetrators the ability to remotely issue system commands and update malware.
Backdoor installation is achieved by taking advantage of vulnerable components in a web application. Once installed, detection is difficult as files tend to be highly obfuscated.
Webserver backdoors are used for a number of malicious activities, including:
1.Data theft
2.Website defacing
3.Server hijacking
4.The launching of distributed denial of service (DDoS) attacks
5.Infecting website visitors (watering hole attacks)
6.Advanced persistent threat (APT) assaults
The working of backdoor attacks depends on the way they enter the system. As observed, the most common ways, using which a backdoor can enter into a system, are using malware or using backdoor-specific software/hardware.There are a number of ways that backdoor threats can be carried out:
1.By exploiting vulnerabilities in the security system that allow unauthorized access to the system or data.
2.By installing malware on a system that gives the attacker control over the system.
3.By using stolen or cracked passwords to gain access to systems.
4.By intercepting communications between systems or users and covertly inserting into these communications messages that give the attacker control over the systems or users.
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