What Is a Backdoor? The Most Effective Ways to Prevent One

The term backdoor is familiar to most computer users. Backdoors show up in many attacks on computers, yet many people never look into what a backdoor is, so detecting and handling them remains very limited. This article from Mona Media covers what a backdoor isand the most effective ways to prevent backdoors today.

What is a backdoor?

A backdoor is a spyware-like program built into the core of software for different purposes, some good and some bad. It can appear on any device, from phones and laptops to network routers, as long as there is an application or software running on it.

A backdoor's main job is to collect information about the person using the software and then do things like send it to a server for storage. In effect, a backdoor is an exchange of data between the software's user and a server.

Put another way, a backdoor refers to a kind of Trojan built into the core of software to serve various purposes. It is already hard to tell whether an application or software is safe, and finding a backdoor is many times harder.

A backdoor gets past security barriers to enter certain devices and software. Once it is installed, a service port opens automatically and lets whoever created the backdoor connect remotely to the software and run commands with ease.

How backdoors mainly work

A backdoor works by getting into a system, bypassing normal security or skipping authentication. Developers use backdoors to deal with problems such as bugs in a system under development.

Developers also create a back door into the technology they build, to troubleshoot and fix problems with the software. A backdoor can help developers get in and out of the application under development more quickly.

While software is being written, tested and debugged, a backdoor can be a shortcut for developers. It should be removed before the software is handed to customers or released, to stop hackers from getting hold of that access.

See also: Top malware scanning tools to protect your website and computer

How does a backdoor operate?

In network security, a backdoor can let outsiders get into your device without your permission. A backdoor can be installed in two different parts of your system:

• Hardware: Physical changes that give remote access to your device.
• Software: Malicious files that hide their illegal activity so your operating system does not know another user is accessing your device.

Software and hardware developers may install backdoors for remote technical support. In most cases, though, backdoors are installed by cybercriminals or governments. Any malware that gives hackers access to your own device can be considered a backdoor.

Types of backdoor

Depending on its purpose, a backdoor is either harmless or harmful.

Harmless backdoor

Software and hardware makers often install a backdoor in their products to monitor them, update the software remotely and find the cause of faults for maintenance.

In a business, a backdoor is installed on employees' (company) computers and phones for the same purposes. This should be spelled out in the employment contract or company policy, and done with the employee's consent.

Harmful backdoor

This type of backdoor is real spyware. Once it gets into a device it makes illegal accesses and steals user information. Sometimes a harmful backdoor also opens a back door to bring in other malware and take over control from the user.

Backdoors are not easy to detect because they operate very discreetly. They are considered a dangerous threat, and one of the most common kinds of malware.

How to detect a backdoor

Security holes can exist in operating systems and in applications. A backdoor is a hole that lets attackers into websites, applications or software. Operating system vulnerabilities are the most serious, because once a hacker gains access to the system they can reach all programs and data on it. Vulnerabilities also let hackers view or modify data on the computer, and this can be hard to detect.

In some cases a backdoor attack is visible right away because it affects how the system works. In others, a backdoor may go unnoticed for hours, days or even months. Finding a backdoor requires analyzing the website's code. Backdoors are often found in files PHP on the website server. A backdoor can also be embedded in core files, plugins, themes or specific files.

To remove a backdoor, first back up your site's files and database. Then review the access-lock file HTTP, because backdoors are usually used through an HTTP POST request to the file. To remove the backdoor you first have to find the illegal access code, then remove it. You need to understand the code that runs a website attacked by a backdoor.

How to prevent a backdoor

• Change default passwords, then turn on multi-factor authentication and use a different password for each application and piece of software.
• Monitor network activity and use a firewall to watch the activity of installed applications.
• Be careful when installing applications and plugins, the two most common ways a backdoor sneaks in. Android and Chromebook users should download apps from Google Play, while Mac and iOS users should use Apple's App Store.
• Use high-quality security tools.
• Follow tech news regularly to stay up to date on backdoors and network security, and head off the worst cases.
• Do not use untrustworthy software, because even trusted applications can still carry a Trojan.
• Keep your operating system updated promptly whenever a new version is available.
• Use reputable, good-quality antivirus software such as Kaspersky Internet Security, Norton Internet Security or McAfee Total Security, and update it regularly after installing.

That covers the basics of what a backdoor is and the most effective ways to prevent backdoors. We hope the article helps you understand what a backdoor is and how to block it on your computer.

If you want to learn more about tools that keep your website running stably and effectively, follow the useful articles at Mona Media today.

See also: How to enable 2FA: strong two-factor authentication