What are Website Backdoors and How to Clean Them?


Are you frustrated with your website getting hacked again and again, even after you’ve cleaned it each time? You’ve spent hours fixing your site, only to find that the problem returns, like an uninvited guest who just won’t leave. Your website becomes slow, strange pop-ups keep appearing, unexpected changes crop up—and you can’t figure out why.

These could be signs of a hidden problem: website backdoors.

30% of all websites fall victim to hacks because of backdoors and other vulnerabilities. It’s like a hidden key under your doormat that allows hackers to sneak in, wreak havoc, and steal sensitive information.

The idea that someone can access your site without your permission is unsettling, especially if you’re not tech-savvy. But don’t stress. In this article, we’ll break down everything you need to know about website backdoors and share practical steps to eliminate them and safeguard your site.

TL;DR: Website backdoors are hidden security holes that hackers use to infiltrate your site. They cause issues like slow performance and unauthorized changes. Identifying and cleaning these backdoors is crucial for maintaining security. For a hassle-free and robust solution, use MalCare to detect, remove, and prevent backdoors effectively.

What is a website backdoor?

Backdoors can take many forms—they might be small snippets of malicious code, entire files, compromised admin accounts, or even permissive file permissions set by hackers. They refer to a variety of ways hackers can keep a channel of unauthorized access open to your site. Essentially, anything that gives attackers remote control over your website can be a backdoor.

The tricky part? They often look like normal files, so spotting them isn’t always easy. Even if you remove the main malware, a backdoor might still be lurking, waiting to let trouble back in. It’s like trying to find a needle in a haystack, but the needle looks just like every other piece of hay. This is why backdoors are tough to get rid of—they’re sneaky and persistent.

Step 1: Identify a backdoor on your website

So you suspect there might be a backdoor on your site. How do you confirm your suspicions? Here are some key signs and methods to help you identify if your website has a backdoor:

  1. Run a security scan: Start with a comprehensive scan of your site using a security plugin. Not all malware scanners can find backdoors, so look out for good ones like MalCare. MalCare is designed to detect malicious code, suspicious files, and other signs of a backdoor. It can give you a clear picture of any lurking threats.
  2. Monitor unusual site behavior: Is your website suddenly slow, crashing, or behaving erratically? Unexplained slowdowns or frequent crashes can indicate that a backdoor is at work, quietly manipulating your site from within.
  3. Check for unwanted or unexpected content: Keep an eye out for strange content that you didn’t put there. Unexpected ads, spammy links, random new pages, or any other content you don’t recognize are red flags. Hackers use backdoors to inject such unwanted content, often to redirect your visitors to malicious sites.
  4. Look out for new, unfamiliar user accounts: Check your user accounts regularly. If you find new accounts that you didn’t create or don’t recognize, it could mean hackers have gained access and are using these accounts to maintain their hold on your site.
  5. Notice warnings in search results: Seeing warnings like This site may harm your computer next to your site in search results is a huge alarm bell. It indicates that search engines have detected malicious activity on your site, which often traces back to backdoors or other malware.
  6. Check for unrecognized or recently modified files: File integrity is crucial. If you discover files that you don’t recognize or notice that files have been recently modified without your knowledge, it’s a strong indicator that a backdoor might be present. Regularly check your file directories for anything unusual.
  7. Notice suspicious activity in site logs: Your site logs are a treasure trove of information. Look for suspicious activities like repeated login attempts, unauthorized access to admin areas, or any other anomalies. Any unusual patterns can point to a backdoor. If you are a MalCare user, you are covered on this front thanks to its activity logs.
  8. Observe unusual traffic patterns: Monitor your site’s traffic analytics. If you notice traffic from unknown IP addresses, unexpected spikes in visits from new countries, or a high bounce rate, these could be signs that hackers are using a backdoor to manipulate your site.

Alright, you’ve identified that your site has a backdoor. Now, let’s get to the business of cleaning it up. Follow these straightforward steps to secure your site and kick those hackers out for good.

Step 2: Scan your site for malware

First things first, scan your site thoroughly. Use a security plugin like MalCare to run this scan. MalCare delves deep into both your site files and its database to find even the stickiest malware. This comprehensive scan identifies hidden threats that might be lurking in your system, whether they are embedded in scripts, hidden within plugins, or tucked away in your database entries. By thoroughly scanning your site, you get a clear picture of all potential vulnerabilities and malicious code present, which is crucial for ensuring a complete cleanup.

Step 3: Clean the malware

Once the scan is complete, it’s time to clean the identified malware. MalCare not only detects malware but also efficiently removes it, ensuring no hidden threats are left behind.

After removing the malware, consider restoring any affected files from a clean backup if necessary. By thoroughly cleaning out all malware, you can restore your website’s integrity and security, paving the way for preventive measures to avoid future breaches.

MalCare HackCleanup Security keys Reset 2

Step 4: Post-removal checklist

After removing the malware, it’s crucial to ensure your site is completely secure and nothing has been overlooked. This post-removal checklist will guide you through the final steps to safeguard your website and prevent any future attacks.

1. Change all your passwords

Change all your passwords. This is crucial to stop hackers from using old credentials to regain access. Here’s what you need to do:

  • Reset your admin passwords: Make sure your new passwords are strong and unique. Use a password manager to help create and remember them.
  • Inform your users: Ask all users with access to your site to reset their passwords. Communicate the importance of choosing strong, unique passwords to prevent future intrusions.

2. Update all your software

Outdated software is a playground for hackers. Check for any available updates for your CMS core, plugins, themes, and any other software associated with your site. If updates are available, apply them immediately. Keeping your software up-to-date patches known vulnerabilities and strengthens your site’s defenses.

3. Enhance your site’s security measures

Implement additional security measures to safeguard your site, like:

  • Install a web application firewall (WAF): A WAF can protect your site from malicious traffic and block attempts to exploit vulnerabilities. If you use MalCare, you get access to its robust Atomic Security firewall that smartly keeps your site protected at all times.
  • Limit login attempts: Restrict the number of failed login attempts to prevent brute force attacks.
  • Implement two-factor authentication (2FA): Enabling 2FA adds an extra layer of security to your login process to make it significantly harder for unauthorized users to gain access.

Step 5: Prevent website backdoors in the future

You’ve cleaned out the backdoors, but how do you make sure they don’t return? It’s all about proactive measures. Here’s a comprehensive guide to future-proof your website against backdoors.

  1. Use a security plugin like MalCare: Start by installing a security plugin like MalCare. It constantly scans your site for vulnerabilities and malware and removes them to provide real-time protection. It’s like having a security guard who never sleeps, always on the lookout for signs of trouble.
  2. Use a web application firewall (WAF): A web application firewall (WAF) adds an essential layer of defense by filtering out malicious traffic before it reaches your site. It’s like having a moat around a castle, keeping the bad guys at bay. Invest in a reliable WAF to block common attack vectors and prevent unauthorized access. MalCare users have their sites protected by the robust Atomic Security firewall that smartly learns from vulnerabilities and keeps your sites secure, even from zero-day attacks.
  3. Keep everything up-to-date: Hackers love outdated software. Keep your CMS core, plugins, themes, and any related software up-to-date. Regular updates patch known vulnerabilities and enhance your site’s security. Think of updates as getting regular car maintenance—they keep everything running smoothly and safely.
  4. Use complex passwords and regularly change them: Strong passwords are crucial for security. Use complex, randomized passwords and change them regularly. A password manager can help you generate and store these passwords securely. Encourage your users to do the same to eliminate weak points in your security infrastructure.
  5. Implement login security measures: Adding extra layers of security to your login process can make a huge difference. Implement two-factor authentication (2FA) and CAPTCHA to thwart automated attacks. These measures act like extra locks on your door, making it much harder for unauthorized users to break in.
  6. Take regular backups of your site: Backup your site regularly so you’re never caught off guard. Reliable backups mean you can quickly restore your site to a previous state if something goes wrong. Make sure to store backups in a secure, off-site location. If you are a MalCare user, you are covered on all these fronts thanks to its backup feature.
  7. Regularly monitor site logs: Frequent monitoring of your site logs can help catch suspicious activities early. Look for unusual login attempts, file changes, or other anomalies. Monitoring is like checking your bank statements regularly—it’s vital for spotting anything out of the ordinary. Use MalCare’s activity log feature to keep track of everything that goes on on your site.
  8. Regularly audit site users and their roles: Keep a close eye on your site’s user accounts. Regularly audit user roles and permissions to ensure there are no unnecessary privileges. Remove any inactive or unfamiliar accounts. This practice minimizes the number of potential entry points for hackers.
  9. Set proper file permissions: Ensure your site files have proper permissions to limit what users can do. Incorrect file permissions can give hackers the ability to modify your files. Use the least privilege principle—only give necessary permissions to the users who need them.
  10. Educate site users and visitors: Lastly, education is key. Inform your site users and visitors about potential attack vectors like phishing scams and social engineering tricks. A knowledgeable user base is less likely to fall victim to these tactics, adding another layer of security to your site. Remember: an alert user is a safe user.
Over 90,000 hack attempts made on WordPress websites every single minute of the day

How do website backdoors get installed?

You might be wondering, “How do these sneaky backdoors even find their way into my website?” Well, hackers have a few tricks up their sleeves. Let’s break down the most common ways these unwelcome guests get in:

  • Vulnerable plugins and themes: Plugins and themes add functionality and design flair to your website. But if you’re not careful, they can also be a backdoor’s best friend. Poorly coded plugins and themes often have security vulnerabilities. Hackers can exploit these weak spots to install malicious code, granting them access to your site.
  • Attackers exploit outdated software: Using outdated software is like leaving your front door wide open. Hackers actively look for sites running on old versions of CMS, PHP, or other software components. These older versions often have known vulnerabilities that are easy targets.
  • Weak passwords: Weak passwords are a hacker’s dream come true. Simple, easily guessable passwords make it a breeze for attackers to gain access to your admin area. So no ‘password123’ or ‘9876543210’ please! Additionally, people forget to change default passwords. You’d be surprised by how many websites still have ‘root’ as their phpMyAdmin password!
  • Social engineering: Sometimes, hackers don’t need to rely on technical vulnerabilities. Social engineering tricks, like phishing emails, can deceive you or your team into revealing sensitive information. An innocent-looking email might trick you into clicking a malicious link or sharing your login credentials.
  • File upload vulnerabilities: Some websites allow users to upload files, whether it’s a profile picture, document, or other content. If these file upload functions aren’t secure, they can provide a way for hackers to upload malicious scripts disguised as harmless files.
  • Server vulnerabilities: Your web hosting environment also plays a critical role in security. Misconfigured servers or hosts that don’t prioritize security can leave your site exposed.

Why are website backdoors dangerous?

Website backdoors are more than just an inconvenience—they pose serious risks to your site’s security, integrity, and reputation. Here’s why backdoors are so dangerous:

  • They can spread malware: Once a hacker has access through a backdoor, they can use your site to distribute malware. This can infect your visitors’ devices, leading to a ripple effect of compromised systems. It’s like a virus spreading through a community—what starts on your site can extend far beyond it, causing widespread harm.
  • They steal sensitive information: Backdoors can serve as a gateway for data breaches. Hackers can siphon off sensitive information like user details, payment data, and confidential business information. This is akin to having a thief infiltrate your filing cabinet and quietly walk away with your most valuable documents.
  • They can deface your website: With control over your site, attackers can deface it by altering its content, displaying offensive messages, or causing it to crash. This not only damages your site’s appearance but can also tarnish your brand’s image and credibility, much like graffiti on a storefront would.
  • They overload server resources: Backdoors can result in unauthorized scripts or programs running on your server, consuming resources and slowing down your site. This added load can lead to frequent crashes and a poor user experience, similar to having too many appliances plugged into one outlet and causing a power surge.
  • They make users distrust your site: When users encounter malware, phishing attempts, or defaced pages, they quickly lose trust in your site. Once trust is lost, it’s hard to regain, and it can significantly impact your traffic and business. It’s like customers avoiding a restaurant that once had a health code violation—they aren’t likely to come back soon.
  • They bog down you and your resources: Backdoors take up a huge amount of your time and resources as you get stuck in a cycle of getting hacked and cleaning the malware. So instead of concentrating on your site and its visitors, you are left fighting digital fires all the time.
Godaddy data breach 2021

Final thoughts

Keeping your website secure from backdoors is essential for a smooth online experience. Backdoors can be sneaky, allowing hackers to mess with your site without you even knowing. By learning how to spot the signs of a compromised site, using helpful tools to detect issues, and taking the right steps to clean up, you can keep your site safe. Regular updates, strong passwords, and good security habits make a big difference in preventing future problems.

For an added layer of protection, use MalCare. It offers real-time malware scanning and automatic removal, and features a strong firewall and regular backups to keep your site secure. With MalCare, you can easily detect and clean backdoor malware without getting too technical. By using MalCare, you’ll have peace of mind knowing your website is well-protected, letting you focus on growing your online presence.


What are backdoor attacks?

Backdoor attacks are a type of cyber attack where hackers exploit vulnerabilities or install malicious software to create an unauthorized entry point into your system or website. This “backdoor” allows them to bypass standard authentication processes and gain continued access to your site.

What is the purpose of a backdoor?

A backdoor serves as a hidden entry point that enables unauthorized users, typically hackers, to gain and maintain access to a system or website without detection. Its main purpose is to allow continuous unauthorized access, facilitate data theft, spread malware, and grant remote control for system manipulation. Hackers may use backdoors to create botnets, send spam, hijack resources for cryptojacking, and maintain persistence even after initial malware is removed.

Is a backdoor malware?

Yes, a backdoor is considered a type of malware. More specifically, backdoors are a subset of malware, whose primary function is to maintain persistent access, allowing hackers to exploit a system continuously.

What does a backdoor look like?

A backdoor can appear as small snippets of malicious code embedded in legitimate files, entire unfamiliar or hidden files, compromised plugins or themes, modified existing files like wp-config.php or .htaccess, permissive file permissions, unauthorized admin accounts, unusual cron jobs or scheduled tasks, and hidden database entries.



You may also like

dns hijacking
DNS Hijacking: All You Need to Know About It

Have you ever typed a familiar URL into your browser only to land on a strange, unfamiliar website? Imagine your visitors facing the same dilemma when accessing your website. They…

How to Protect Your Website from Hackers
How to Protect Your Website from Hackers

Every day, small businesses become victims of cyber attacks. Hackers break into websites, steal customer data, and damage reputations. Your website, which is vital for your business, is at risk…

10 Website Hacks and How to Prevent Them
10 Website Hacks and How to Prevent Them

Are you aware of how vulnerable your website might be right now? Every 39 seconds, a new cyber attack occurs, with hackers wreaking havoc on thousands of sites every day….

How can we help you?

If you’re worried that your website has been hacked, MalCare can help you quickly fix the issue and secure your site to prevent future hacks.

My site is hacked – Help me clean it

Clean your site with MalCare’s AntiVirus solution within minutes. It will remove all malware from your complete site. Guaranteed.

Secure my WordPress Site from hackers

MalCare’s 7-Layer Security Offers Complete Protection for Your Website. 300,000+ Websites Trust MalCare for Total Defence from Attacks.