Websites and eCommerce applications are increasingly deployed on cloud and VPS infrastructure because VPS platforms provide flexibility, performance and cost advantages for small and medium-sized businesses. However, concentrating multiple applications on a single VPS also creates a significant security responsibility.

A compromise that begins with Joomla, WordPress, WooCommerce, Magento or another web application can potentially expand into the underlying Linux server. Attackers may deploy web shells, modify application files, steal credentials, create unauthorized administrator accounts, install cron jobs, create systemd persistence, add SSH keys, establish outbound command-and-control communications, or attempt to obtain root privileges.

Consequently, website malware removal alone is not sufficient.

This research paper presents a layered methodology for rootkit hunting, malware detection, VPS hardening, application security, incident response and continuous monitoring. The framework incorporates ClamAV, UFW, RKHunter, chkrootkit, AIDE/file-integrity monitoring, SSH hardening, AppArmor, vulnerability management, centralized logging and application-specific security controls.

The methodology is applied to three major web application environments:

• Joomla
• WordPress and WooCommerce
• Magento / Adobe Commerce

The paper also addresses custom PHP, Python, Node.js and other web applications.

The central proposition is:

A clean website does not necessarily mean a clean server. When application compromise is suspected, both the application layer and the underlying VPS must be investigated.

Rootkit Hunting and VPS Hardening for Joomla, WordPress, Magento and Web Applications-A Practical Security and Incident-Response Framework for SME Websites, eCommerce Platforms and Internet-Facing VPS Infrastructure

Published by: KeenComputer / IAS-Research
Publication Date: September 2026
Research Area: Cybersecurity, Linux Server Security, Web Application Security, eCommerce Security, Incident Response

Abstract

Websites and eCommerce applications are increasingly deployed on cloud and VPS infrastructure because VPS platforms provide flexibility, performance and cost advantages for small and medium-sized businesses. However, concentrating multiple applications on a single VPS also creates a significant security responsibility.

A compromise that begins with Joomla, WordPress, WooCommerce, Magento or another web application can potentially expand into the underlying Linux server. Attackers may deploy web shells, modify application files, steal credentials, create unauthorized administrator accounts, install cron jobs, create systemd persistence, add SSH keys, establish outbound command-and-control communications, or attempt to obtain root privileges.

Consequently, website malware removal alone is not sufficient.

This research paper presents a layered methodology for rootkit hunting, malware detection, VPS hardening, application security, incident response and continuous monitoring. The framework incorporates ClamAV, UFW, RKHunter, chkrootkit, AIDE/file-integrity monitoring, SSH hardening, AppArmor, vulnerability management, centralized logging and application-specific security controls.

The methodology is applied to three major web application environments:

• Joomla
• WordPress and WooCommerce
• Magento / Adobe Commerce

The paper also addresses custom PHP, Python, Node.js and other web applications.

The central proposition is:

A clean website does not necessarily mean a clean server. When application compromise is suspected, both the application layer and the underlying VPS must be investigated.

1. Introduction

Modern SME websites frequently depend on a complex technology stack:

Internet | v CDN / WAF | v Firewall | v Nginx / Apache | v PHP-FPM / Application Runtime | +--------------------+ | | v v CMS / eCommerce Custom Apps | +--------------------+ | v MariaDB / MySQL | +--------------------+ | v Redis / Search / Queue

Below this application architecture is the Linux operating system and VPS infrastructure.

An attacker does not necessarily respect the boundaries that administrators see in the architecture.

A vulnerability in a CMS extension can become arbitrary code execution. Arbitrary code execution can become credential theft. Credential theft can become privilege escalation. Privilege escalation can become full server compromise.

Therefore, security must be considered as a chain:

Application Security | v Runtime Security | v Web Server Security | v Operating-System Security | v Network Security | v Identity Security | v Backup and Recovery

2. Research Objective

The objective of this paper is to establish a practical framework for:

1. Detecting malicious software and backdoors.
2. Hunting for rootkits and persistence mechanisms.
3. Hardening Ubuntu-based VPS environments.
4. Reducing externally exposed services.
5. Protecting Joomla, WordPress, WooCommerce and Magento.
6. Detecting unauthorized application-file changes.
7. Investigating suspicious processes and network connections.
8. Protecting SSH and administrative accounts.
9. Establishing effective logging and monitoring.
10. Developing a repeatable incident-response process.
11. Recovering safely from a compromised server.
12. Establishing continuous security operations.

3. The Threat Model

A typical compromise can develop through several stages.

Vulnerability | v Initial Access | v Code Execution | v Web Shell / Backdoor | v Credential Theft | v Privilege Escalation | v Persistence | v Server Compromise | v Data Theft / Spam / Botnet / Destruction

Potential initial-access mechanisms include:

• vulnerable CMS core
• vulnerable plugins
• vulnerable extensions
• vulnerable themes
• stolen administrator credentials
• exposed administrative services
• insecure file uploads
• vulnerable third-party libraries
• weak server configuration
• compromised developer credentials
• vulnerable APIs

4. Understanding Web Shells, Backdoors and Rootkits

These terms describe different levels of compromise.

4.1 Web Shell

A web shell is malicious code that provides an attacker with command or code-execution capabilities through a web request.

A simplified attack path is:

HTTP Request | v Malicious PHP | v Web Server | v Operating-System Command

The process may initially operate as:

www-data

or another web-server account.

4.2 Application Backdoor

A backdoor can be hidden inside:

• Joomla extensions
• Joomla templates
• WordPress plugins
• WordPress themes
• WordPress MU-plugins
• Magento modules
• PHP classes
• configuration files
• database records

The backdoor may not contain obvious commands such as eval() or shell_exec().

4.3 Persistence

Persistence allows an attacker to regain access after remediation.

Possible mechanisms include:

• SSH authorized keys
• cron jobs
• systemd services
• systemd timers
• shell startup files
• PHP configuration
• malicious plugins
• malicious extensions
• database manipulation
• scheduled application tasks

4.4 Rootkit

A rootkit represents a substantially deeper compromise.

A sophisticated rootkit may attempt to hide:

• processes
• files
• network connections
• users
• system activity

If root-level compromise is suspected, the administrator must question whether the operating system itself remains trustworthy.

5. The Security Architecture

A robust SME VPS security architecture should contain several independent layers.

INTERNET | v +-------------+ | CDN / WAF | +------+------+ | v +-------------+ | UFW | +------+------+ | v +-------------+ | Nginx/Apache| +------+------+ | v +-------------+ | PHP-FPM/App | +------+------+ | +-------------+-------------+ | | | v v v Joomla WordPress Magento | | | +-------------+-------------+ | MariaDB / MySQL | Redis / Search / Queue -------------------------------------------- Ubuntu Linux | +--------------------+--------------------+ | | | v v v ClamAV RKHunter chkrootkit | | | +--------------------+--------------------+ | AIDE / FIM | Audit Logs | SIEM / Wazuh

No individual security product provides complete protection.

The architecture relies on defense in depth.

6. VPS Hardening

VPS hardening is the first line of defense against infrastructure compromise.

The objective is to minimize:

• exposed services
• administrative privileges
• unnecessary software
• weak authentication
• writable system locations
• outdated software
• uncontrolled outbound communication

7. Ubuntu Security Updates

Security updates should be applied consistently.

Check the system:

sudo apt update sudo apt upgrade

Where appropriate, configure automatic security updates.

Verify:

systemctl status unattended-upgrades

Review:

/var/log/unattended-upgrades/

Automatic updates should be combined with application testing and backup procedures, especially for complex Magento environments.

8. UFW Firewall Hardening

Uncomplicated Firewall, commonly known as UFW, provides a practical firewall management interface for Ubuntu.

The basic principle is:

Deny unnecessary inbound traffic and explicitly permit only required services.

Check the current configuration:

sudo ufw status verbose

Establish secure defaults:

sudo ufw default deny incoming sudo ufw default allow outgoing

Permit HTTPS:

sudo ufw allow 443/tcp

Permit HTTP when required:

sudo ufw allow 80/tcp

SSH requires special attention.

A basic rule is:

sudo ufw allow 22/tcp

A more restrictive approach is:

sudo ufw allow from <ADMIN-IP> to any port 22 proto tcp

Before enabling UFW remotely, verify that the SSH rule permits continued administrative access.

Then:

sudo ufw enable

Verify:

sudo ufw status numbered

9. UFW and Network Exposure

The firewall should be correlated with actual listening services.

Run:

sudo ss -tulpn

Then compare with:

sudo ufw status numbered

Every publicly accessible service should have a business justification.

A typical web VPS might expose:

Port	Service	Internet Access
22	SSH	Restricted
80	HTTP	Yes, when required
443	HTTPS	Yes
3306	MariaDB	No
6379	Redis	No
9200	Search	No

Unexpected listening ports should be investigated.

10. SSH Hardening

SSH is a high-value target because successful SSH access can bypass application security entirely.

Recommended controls include:

• key-based authentication
• restricted administrative users
• least privilege
• limited root access
• MFA where practical
• firewall restrictions
• monitoring failed logins
• regular key review

Review authorized keys:

cat ~/.ssh/authorized_keys

Find all authorized-key files:

sudo find /home -path '*/.ssh/authorized_keys' -type f -print

An unknown SSH key should be treated as a potentially serious persistence indicator.

11. User and Privilege Audit

Review accounts:

cat /etc/passwd

Review privileged groups:

getent group sudo

Investigate:

• unknown users
• unexpected UID 0 accounts
• unexpected sudo privileges
• recently created accounts
• abandoned accounts

The objective is to ensure that every privileged identity has a legitimate purpose.

12. AppArmor

AppArmor can provide an additional security boundary between applications and the operating system.

Check status:

sudo aa-status

The security objective is:

Compromised Application | v Restricted Profile | v Limited System Access

rather than:

Compromised Application | v Unrestricted Server Access

AppArmor should be considered part of the operating-system hardening strategy.

13. File Permissions

Incorrect permissions can turn an application vulnerability into a much larger compromise.

Avoid:

chmod -R 777

Web applications should be able to write only to directories where writing is genuinely required.

The desired model is:

Web Application | +---- Read application code | +---- Write required data directories | X---- Write system files

14. ClamAV Malware Detection

ClamAV provides a valuable malware-detection layer for Linux web servers.

Install:

sudo apt update sudo apt install clamav clamav-daemon

Verify:

clamscan --version

Check the daemon:

systemctl status clamav-daemon

Check signature updates:

systemctl status clamav-freshclam

Manually update when necessary:

sudo freshclam

15. ClamAV Website Scanning

Scan a Joomla website:

sudo clamscan -r \ --infected \ /var/www/example.com/

Scan multiple websites:

sudo clamscan -r \ --infected \ /var/www/

Create a log:

sudo clamscan -r \ --infected \ --log=/var/log/clamav/web-scan.log \ /var/www/

ClamAV can be especially useful as a second opinion when application integrity is uncertain.

16. ClamAV and Joomla

For Joomla, prioritize scanning:

/var/www/site/ /images/ /media/ /tmp/ /cache/

A targeted scan might be:

sudo clamscan -r --infected /var/www/site/

Search separately for executable files in upload directories:

find /var/www/site/images \ -type f \( -name "*.php" -o -name "*.phtml" \) -ls

An unexpected PHP file in an image directory deserves investigation even if ClamAV reports no malware.

17. ClamAV and WordPress

For WordPress:

sudo clamscan -r --infected /var/www/wordpress/

Give particular attention to:

wp-content/plugins/ wp-content/themes/ wp-content/mu-plugins/ wp-content/uploads/

Search uploads:

find wp-content/uploads \ -type f \( -name "*.php" -o -name "*.phtml" \) -ls

18. ClamAV and Magento

Magento installations can contain very large numbers of files.

Targeted scanning can therefore be useful:

sudo clamscan -r --infected /var/www/magento/pub/

Then:

sudo clamscan -r --infected /var/www/magento/app/

Pay particular attention to:

pub/media/ app/code/ app/design/

Composer-managed vendor/ content should additionally be validated against trusted package sources.

19. ClamAV Limitations

ClamAV is not a rootkit detector and is not a guarantee that a server is clean.

It may not detect:

• new malware
• custom backdoors
• fileless attacks
• stolen credentials
• database persistence
• legitimate tools abused by attackers
• carefully modified application code

Therefore:

ClamAV should be treated as one detection layer in a larger security program.

20. Rootkit Hunting

Rootkit hunting requires several independent investigations.

Start with processes:

ps auxf

Check resource usage:

top

Check network connections:

ss -tpn

Check listening services:

ss -tulpn

Investigate unfamiliar:

• processes
• binaries
• ports
• services
• users
• connections

21. Suspicious Temporary Files

Attackers commonly use temporary directories.

Investigate:

find /tmp /var/tmp /dev/shm -type f -ls

Search for executables:

find /tmp /var/tmp /dev/shm \ -type f -perm /111 -ls

Do not automatically delete suspicious files.

First determine:

1. Who owns the file?
2. When was it created?
3. When was it modified?
4. What process uses it?
5. Which web request created it?
6. Does it have persistence?
7. Is it associated with other suspicious files?

22. Rootkit Hunter

RKHunter provides another layer of rootkit-oriented analysis.

Run:

sudo rkhunter --update sudo rkhunter --check

Review the results carefully.

Warnings should be investigated rather than automatically classified as malware.

23. chkrootkit

Another traditional rootkit detection tool is:

sudo chkrootkit

The output should be correlated with:

• process analysis
• package integrity
• logs
• network connections
• filesystem changes

No rootkit scanner should be considered definitive.

24. Package Integrity

On Ubuntu/Debian systems:

dpkg -V

can help identify changes to package-managed files.

Review installed packages:

dpkg -l

Unexpected software should be investigated.

25. Cron Persistence

Review the current user's cron:

crontab -l

Review system cron:

sudo cat /etc/crontab

Review cron directories:

sudo ls -la /etc/cron.d/ sudo ls -la /etc/cron.daily/ sudo ls -la /etc/cron.hourly/ sudo ls -la /etc/cron.weekly/

Look for:

• unfamiliar scripts
• encoded commands
• commands downloading remote content
• execution from /tmp
• commands running as root
• unexplained PHP execution

26. systemd Persistence

List running services:

systemctl list-units --type=service --state=running

List enabled services:

systemctl list-unit-files --state=enabled

Review timers:

systemctl list-timers --all

For suspicious services:

systemctl status <service> systemctl cat <service>

27. Web-Server Investigation

Investigate:

Nginx Apache PHP-FPM

Look for:

• unexpected configuration changes
• unusual rewrite rules
• proxy configurations
• unexpected virtual hosts
• PHP-FPM pool changes
• suspicious upload handlers
• modified document roots

Web-server logs are particularly valuable for connecting an attacker's HTTP request to subsequent filesystem activity.

28. Joomla Backdoor-Hunting Use Case

Suppose a Joomla website displays:

• Japanese or Chinese SEO spam
• unexpected redirects
• unknown pages
• search-engine spam
• suspicious PHP files

The investigation should proceed beyond Joomla itself.

Application Layer

Inspect:

index.php configuration.php .htaccess administrator/ components/ modules/ plugins/ templates/ images/ media/ tmp/ cache/

Search for suspicious constructs:

grep -RniE \ 'eval\(|base64_decode|gzinflate|shell_exec|passthru|system\(' \ /var/www/example.com/

These searches identify indicators and require manual validation.

29. Joomla Core Integrity

Obtain the exact Joomla release from a trusted official source and compare it with the installed files.

For example:

diff -r clean-joomla/ /var/www/example.com/

The investigation should identify:

• modified core files
• unexpected files
• malicious extensions
• modified templates
• altered .htaccess
• suspicious configuration changes

Third-party Joomla security and monitoring services can provide additional integrity checks, but they should complement—not replace—server-level investigation.

30. WordPress Backdoor-Hunting Use Case

WordPress presents a different but equally important attack surface.

Inspect:

wp-admin/ wp-includes/ wp-content/plugins/ wp-content/themes/ wp-content/mu-plugins/ wp-content/uploads/ wp-config.php

Search for suspicious PHP:

grep -RniE \ 'eval\(|base64_decode|gzinflate|shell_exec|passthru|assert\(' \ wp-content/

Investigate:

• unknown plugins
• unknown themes
• modified functions.php
• modified wp-config.php
• MU-plugins
• PHP files in uploads
• unknown administrator accounts

31. WooCommerce Security Use Case

WooCommerce introduces additional business risks because the system handles:

• customer accounts
• orders
• addresses
• payment integrations
• shipping information
• API credentials
• business data

Security investigations should therefore include:

WordPress | +-- WooCommerce | +-- Payment gateways | +-- Webhooks | +-- REST APIs | +-- Customer accounts | +-- Administrator accounts

A compromise can affect both the website and the organization's commercial operations.

32. Magento Security Use Case

Magento and Adobe Commerce require special attention because of their complex architecture.

A typical deployment may include:

Magento | +-- PHP +-- Composer +-- Nginx/Apache +-- MariaDB/MySQL +-- Redis +-- OpenSearch/Elasticsearch +-- Cron +-- Queue consumers +-- Third-party modules

A compromise may therefore occur at several levels.

33. Magento File Integrity

Investigate:

app/code/ app/design/ pub/ pub/media/ var/ generated/ vendor/ bin/

Search for PHP files in media:

find pub/media \ -type f \( -name "*.php" -o -name "*.phtml" \) -ls

Unexpected executable files should be investigated.

Magento deployments should also use trusted Composer repositories and maintain controlled dependency versions.

Adobe provides security scanning capabilities for Magento Open Source and Adobe Commerce, which can complement internal server monitoring.

34. Magento Cron and Persistence

Magento depends on scheduled operations.

Review:

crontab -l

and investigate application-level scheduled tasks.

An attacker may attempt to use legitimate scheduled mechanisms to recreate malicious files.

Therefore:

File Cleanup X is not sufficient File Cleanup + Persistence Investigation

is required.

35. Magento Credentials and Encryption

Following a suspected Magento compromise, evaluate:

• administrator passwords
• database credentials
• API credentials
• payment integration credentials
• cloud credentials
• SSH credentials
• deployment credentials
• encryption keys

Credential rotation should occur after containment and as part of a controlled incident-response procedure.

36. Custom Web Application Use Case

The same framework applies to:

• Laravel
• Symfony
• CodeIgniter
• Django
• Flask
• Node.js
• REST APIs
• GraphQL
• microservices

The investigation should map:

Authentication | File Upload | Command Execution | Database | Secrets | Dependencies | Background Jobs | Scheduled Tasks

37. Database Security

Databases should normally remain on private interfaces.

Avoid:

Internet ---> MariaDB

Prefer:

Internet | Web Application | Private Database Network | MariaDB

Review:

• database users
• privileges
• remote access
• passwords
• unused accounts
• backup credentials

38. Log Analysis

Security logging should cover:

SSH sudo Nginx Apache PHP-FPM Joomla WordPress Magento MariaDB/MySQL Firewall System

A particularly valuable forensic correlation is:

HTTP Request | v PHP Execution | v File Modification | v New Process | v Outbound Connection

This can provide evidence of an attack chain.

39. Suspicious Web-Log Patterns

Look for:

• POST requests to unexpected PHP files
• POST requests to upload directories
• repeated requests to nonexistent files
• command-injection attempts
• suspicious file uploads
• repeated administrator probing
• unexpected requests from unusual sources
• requests followed by file modifications

Web logs should be retained long enough to support meaningful investigation.

40. File-Integrity Monitoring

A trusted filesystem baseline can detect unexpected modifications.

The model is:

Known-Clean System | v Baseline | v Hashes / Metadata | v Continuous Comparison | v Unexpected Change | v Security Investigation

Potential technologies include:

• AIDE
• Wazuh
• OSSEC
• auditd
• inotify-based monitoring

File integrity monitoring is especially valuable for:

• Joomla core
• WordPress core
• plugins
• themes
• Magento modules
• PHP configuration
• server configuration

41. Incident Response

A compromised website should be handled as a security incident rather than simply a maintenance task.

The basic lifecycle is:

Preparation | Detection | Containment | Investigation | Eradication | Recovery | Lessons Learned

42. Preparation

Before an incident:

• maintain asset inventory
• maintain software inventory
• maintain backups
• test backup restoration
• maintain server documentation
• monitor security logs
• document administrative access
• establish incident procedures

43. Detection

Possible indicators include:

• SEO spam
• redirects
• unknown administrators
• unknown SSH keys
• high CPU utilization
• unknown processes
• unexpected ports
• unexpected PHP files
• spam originating from the server
• security scanner warnings
• customer complaints
• search-engine warnings

44. Containment

When active compromise is confirmed:

1. Restrict public access.
2. Protect administrative access.
3. Preserve relevant logs.
4. Create an appropriate snapshot or forensic copy.
5. Prevent further attacker access.
6. Identify affected applications.
7. Determine whether other sites on the VPS are affected.

UFW may assist with network containment, but firewall blocking alone should not be considered sufficient if root compromise is suspected.

45. Eradication

Eradication may require removal of:

• web shells
• malicious PHP
• malicious plugins
• malicious extensions
• unauthorized users
• unauthorized SSH keys
• cron persistence
• systemd persistence
• malicious binaries
• vulnerable software

The original vulnerability must also be identified and corrected.

46. Rebuild vs. Clean-in-Place

One of the most important decisions is whether to clean the existing server or rebuild it.

If there is strong evidence that only an application was compromised and the operating system remains trustworthy, controlled application remediation may be possible.

However:

If root-level compromise cannot be ruled out, rebuilding the VPS from a trusted operating-system image is generally the safer approach.

The reason is straightforward:

Compromised OS | X "Trust every command"

The administrator cannot necessarily prove that every system component remains trustworthy.

47. Recovery

A trusted recovery process is:

Fresh OS | Security Updates | Firewall | SSH Hardening | AppArmor | Web Server | PHP | Database | Application | Verified-Clean Data

Avoid blindly restoring a complete compromised backup.

Backups should be classified according to their trustworthiness and restoration date.

48. Credential Rotation

Potentially exposed credentials should be evaluated and rotated.

These may include:

• Linux credentials
• SSH keys
• Joomla administrator accounts
• WordPress administrator accounts
• Magento administrator accounts
• database passwords
• SMTP credentials
• API keys
• payment integration credentials
• DNS credentials
• cloud credentials
• Git credentials
• deployment credentials
• encryption keys

Credential rotation should be performed in a controlled sequence after containment.

49. Backup Strategy

A serious security program requires more than automated backups.

The backup lifecycle should be:

Backup | Integrity Check | Off-Site Storage | Restore Test | Application Validation

Maintain multiple recovery points where possible.

The organization should know:

• what is backed up
• where it is stored
• how long it is retained
• how it is restored
• who can access it
• whether backups can be modified by an attacker

50. Continuous Monitoring

Security should not end after the site is cleaned.

A managed VPS should continuously monitor:

Processes Network Users SSH Filesystem Applications Logs Packages Vulnerabilities Malware

A security dashboard can track:

Security Metric	Desired State
Critical vulnerabilities	0
Unknown administrators	0
Unknown SSH keys	0
Unknown services	0
Unknown public ports	0
PHP in upload directories	0
Failed backup tests	0
Rootkit alerts	Investigate immediately
File-integrity alerts	Investigate
Security updates	Current
Centralized logging	Enabled

51. Recommended SME Security Stack

A practical SME environment can combine:

Ubuntu | UFW | SSH Hardening | AppArmor | Nginx / Apache | PHP-FPM | Joomla / WordPress / Magento | ClamAV | RKHunter | chkrootkit | AIDE / File Integrity | Centralized Logs | Wazuh / SIEM | Backup / Recovery

The objective is not to accumulate security products.

The objective is to establish independent security controls covering different failure modes.

52. Security Maturity Model

Level 1 — Reactive

Website hacked | Clean files | Change password

This provides limited protection.

Level 2 — Basic

Updates Firewall Backups SSL Strong passwords

Level 3 — Managed

Updates + Malware scanning + Logging + File integrity + Monitoring

Level 4 — Incident Ready

Detection + Containment + Forensics + Eradication + Rebuild + Recovery

Level 5 — Continuous Security Engineering

Asset Inventory + Vulnerability Management + Least Privilege + Application Isolation + Continuous Monitoring + Centralized Logging + Incident Response + Disaster Recovery + Security Improvement

Level 5 should be the target for mission-critical eCommerce environments.

53. KeenComputer as a Strategic Security Partner

KeenComputer can position VPS security as part of a broader managed digital infrastructure and cybersecurity service for SMEs.

Potential services include:

VPS Security Assessment

• VPS architecture review
• UFW review
• SSH audit
• account audit
• rootkit hunting
• process analysis
• network analysis
• cron/systemd investigation

Application Security

• Joomla
• WordPress
• WooCommerce
• Magento
• custom web applications

Incident Response

Detection | Containment | Investigation | Eradication | Recovery

Continuous Security

Patch Management + Malware Detection + File Integrity + Vulnerability Monitoring + Backup Verification + Security Reporting

54. IAS-Research as the Research and Engineering Layer

IAS-Research can complement operational security through research and engineering capabilities.

Potential areas include:

• Linux security research
• web application security research
• vulnerability analysis
• cybersecurity architecture
• AI-assisted security analysis
• log analytics
• RAG-based security knowledge systems
• security automation
• embedded and IoT security
• forensic research
• security engineering

The combined model becomes:

IAS-Research Research Engineering Innovation Threat Analysis | v KeenComputer Implementation Infrastructure Managed Security | v SME Customer Secure Digital Infrastructure

55. AI-Assisted Security Operations

AI can provide an additional analysis layer for large quantities of security information.

A possible architecture is:

Nginx Logs Apache Logs SSH Logs PHP Logs Joomla Logs WordPress Logs Magento Logs Firewall Logs System Logs | v Log Collection | v Security Database / SIEM | v RAG Knowledge Base | v AI Security Assistant | +-- Correlation +-- Classification +-- Investigation +-- Alert Prioritization +-- Recommended Actions

AI should not automatically perform destructive operations such as deleting files, disabling accounts or rebuilding production systems without appropriate human authorization.

56. Unified Rootkit-Hunting Procedure

A practical investigation can follow this sequence.

Phase 1 — Establish Scope

How many websites? Which VPS? Which users? Which applications? Which databases?

Phase 2 — Network

ss -tulpn ss -tpn sudo ufw status numbered

Phase 3 — Processes

ps auxf top

Phase 4 — Persistence

crontab -l systemctl list-timers --all systemctl list-unit-files --state=enabled

Phase 5 — Identity

cat /etc/passwd getent group sudo find /home -path '*/.ssh/authorized_keys' -type f -print

Phase 6 — Malware

clamscan rkhunter chkrootkit

Phase 7 — Filesystem

find /tmp /var/tmp /dev/shm -type f -ls dpkg -V

Phase 8 — Application

Inspect:

Joomla WordPress WooCommerce Magento Custom Applications

Phase 9 — Logs

Correlate:

HTTP PHP Filesystem Process Network SSH

Phase 10 — Decision

Application compromise only? | +---- Yes ---> Remediate application | +---- No / uncertain | v Rebuild VPS

57. Security Checklist

VPS

• Ubuntu fully updated
• UFW enabled
• Incoming traffic denied by default
• Only required ports exposed
• SSH restricted
• Root access controlled
• AppArmor enabled
• Unnecessary services removed
• Users reviewed
• Sudo access reviewed

Malware

• ClamAV installed
• FreshClam operational
• Scheduled malware scanning
• RKHunter installed
• chkrootkit installed
• Temporary directories investigated
• File-integrity monitoring deployed

Joomla

• Core integrity verified
• Extensions reviewed
• Templates reviewed
• .htaccess reviewed
• configuration.php reviewed
• Upload directories inspected
• Administrator accounts reviewed

WordPress

• Core integrity verified
• Plugins reviewed
• Themes reviewed
• MU-plugins reviewed
• Upload directory inspected
• Administrator accounts reviewed
• WooCommerce integrations reviewed

Magento

• Core integrity verified
• Composer dependencies reviewed
• Modules reviewed
• pub/media inspected
• Cron reviewed
• Administrator accounts reviewed
• API credentials reviewed
• Encryption credentials evaluated
• Security scanning performed

Recovery

• Backups available
• Backups integrity checked
• Restore tested
• Credentials rotated
• Vulnerability eliminated
• Logs retained
• Post-incident monitoring enabled

58. Recommended Security Operations Schedule

Daily

• Review critical security alerts.
• Check malware alerts.
• Check failed authentication.
• Verify critical services.
• Monitor backup status.

Weekly

• Review file-integrity changes.
• Review new accounts.
• Review SSH keys.
• Review new services.
• Review listening ports.
• Review application updates.

Monthly

• Perform vulnerability assessment.
• Review Joomla extensions.
• Review WordPress plugins.
• Review Magento modules.
• Test backup restoration.
• Review firewall rules.
• Review privileged accounts.

Quarterly

• Perform full VPS security assessment.
• Conduct incident-response exercise.
• Review disaster recovery.
• Review architecture.
• Review security policies.
• Perform penetration testing where appropriate.

59. The Ten Fundamental Principles

Principle 1

A CMS compromise may become a VPS compromise.

Principle 2

A clean website does not prove a clean server.

Principle 3

A clean ClamAV scan does not prove a clean server.

Principle 4

A clean rootkit scan does not prove a clean server.

Principle 5

Persistence must be investigated independently from malware.

Principle 6

Do not destroy forensic evidence prematurely.

Principle 7

Credentials accessible to a compromised system may need to be considered exposed.

Principle 8

Root-level compromise changes the trust model.

Principle 9

When server trust cannot be established, rebuilding is often safer than attempting to prove cleanliness.

Principle 10

Security is a continuous engineering process, not a one-time malware cleanup.

60. Final Action Plan for SMEs

An SME operating Joomla, WordPress, WooCommerce, Magento or custom web applications should begin with the following sequence.

Step 1 — Inventory

Document:

• websites
• applications
• domains
• users
• services
• ports
• databases
• plugins
• extensions
• themes
• scheduled tasks

Step 2 — Establish a Trusted Baseline

Document:

• installed packages
• running services
• listening ports
• users
• SSH keys
• application versions
• file-integrity baseline

Step 3 — Harden the VPS

Deploy:

UFW SSH Hardening AppArmor Least Privilege Security Updates Secure Permissions

Step 4 — Deploy Detection

Deploy:

ClamAV RKHunter chkrootkit AIDE/FIM Log Monitoring SIEM where appropriate

Step 5 — Harden Applications

Perform application-specific audits for:

Joomla WordPress WooCommerce Magento Custom Applications

Step 6 — Establish Backup and Recovery

Maintain:

Local Backup + Off-Site Backup + Integrity Verification + Restore Testing

Step 7 — Establish Incident Response

Prepare procedures for:

Detection Containment Investigation Eradication Rebuild Recovery Post-Incident Improvement

Step 8 — Monitor Continuously

Security should continue after remediation.

61. Conclusion

The security of a modern web application cannot be separated from the security of the infrastructure on which it operates.

A Joomla website may be compromised through an extension. A WordPress website may be compromised through a plugin or administrator credential. WooCommerce may expose customer and transaction risks. Magento may be compromised through a vulnerable module, integration or application component.

But the most serious consequence can occur when the attacker moves beyond the application.

The attack can become:

Web Application | v PHP / Runtime | v Web Server | v Operating System | v Root Privileges | v Persistence | v Entire VPS

Consequently, a comprehensive security program must combine application security and infrastructure security.

ClamAV contributes malware detection.

UFW reduces network exposure.

SSH hardening protects administrative access.

AppArmor provides an additional application-security boundary.

RKHunter and chkrootkit assist with rootkit hunting.

AIDE and other file-integrity mechanisms detect unauthorized changes.

Log analysis reconstructs events.

Vulnerability management reduces the probability of initial compromise.

Backups and tested recovery procedures provide resilience.

Incident response provides a structured path from detection to recovery.

The resulting security philosophy is:

Prevent what can be prevented. Detect what gets through. Contain the compromise. Investigate the attack path. Remove persistence. Rebuild when trust is lost. Restore verified-clean systems and data. Then continuously monitor and improve.

For SMEs, this approach provides a practical path from basic website protection toward professional security engineering and managed digital infrastructure.