CMSBrute

CMSBrute is a type of malware designed to exploit vulnerabilities in Content Management Systems (CMS) through brute force attacks. These attacks typically target the login credentials of CMS platforms, aiming to gain unauthorized access to websites. Once access is obtained, attackers can manipulate website content, inject malicious code, or exfiltrate sensitive data. CMSBrute is particularly concerning for website administrators and businesses relying on CMS platforms for their online presence. As of October 2023, CMSBrute continues to pose a significant threat to the security of websites worldwide.

Overview

CMSBrute is a malware family that targets Content Management Systems (CMS) by performing brute force attacks on login credentials. Brute force attacks involve systematically trying numerous combinations of usernames and passwords until the correct one is found. CMSBrute specifically focuses on exploiting weak or default credentials to gain unauthorized access to CMS platforms. Once access is obtained, attackers can perform various malicious activities, including defacing websites, stealing sensitive information, or deploying additional malware.

History

The emergence of CMSBrute can be traced back to the increasing popularity of CMS platforms such as WordPress, Joomla, and Drupal. These platforms are widely used due to their ease of use and flexibility, making them attractive targets for cybercriminals. CMSBrute was first identified in the early 2010s, as attackers began leveraging automated tools to perform brute force attacks on CMS login pages. Over the years, CMSBrute has evolved, incorporating more sophisticated techniques to bypass security measures and evade detection.

Technical characteristics

CMSBrute operates by automating the process of attempting multiple username and password combinations on CMS login pages. The malware typically uses a list of common or default credentials, as well as credentials obtained from previous data breaches. CMSBrute may also employ techniques such as IP rotation to avoid detection and rate limiting, which are measures implemented by websites to prevent excessive login attempts from a single IP address. Additionally, CMSBrute can be configured to target specific CMS platforms, exploiting known vulnerabilities to increase the likelihood of successful access.

Infection vector

CMSBrute primarily spreads through compromised websites and phishing campaigns. Attackers may distribute the malware by embedding it in malicious links or attachments in phishing emails. Once a user interacts with the malicious content, CMSBrute is downloaded and executed on their system. The malware then begins scanning for CMS login pages and initiates brute force attacks. Additionally, CMSBrute can propagate through networks by exploiting weak credentials on other connected systems, further expanding its reach.

Notable campaigns

Several notable campaigns involving CMSBrute have been documented over the years. One such campaign targeted WordPress websites, exploiting weak administrative credentials to gain control over the sites. Attackers then used the compromised websites to host phishing pages and distribute additional malware. Another campaign focused on Joomla platforms, where CMSBrute was used to inject malicious scripts into websites, redirecting visitors to malicious domains. These campaigns highlight the persistent threat posed by CMSBrute and the importance of securing CMS platforms against brute force attacks.

Detection and mitigation

Detecting CMSBrute involves monitoring for unusual login activity, such as multiple failed login attempts from different IP addresses. Implementing security measures like two-factor authentication (2FA) and strong, unique passwords can significantly reduce the risk of brute force attacks. Additionally, website administrators should regularly update their CMS platforms and plugins to patch known vulnerabilities. Employing web application firewalls (WAFs) can also help block malicious traffic and prevent unauthorized access attempts. Regular security audits and vulnerability assessments are recommended to identify and address potential weaknesses in CMS configurations.

See also

• Brute force attack
• Content Management System
• Malware

Sources

• MITRE ATT&CK - Brute Force
• CISA - Content Management Systems Security
• NIST - Guide to Enterprise Patch Management Technologies
• OWASP - Brute Force Protection
• Securelist - CMS Security

(Note: The "See also" section does not contain links as there are no slugs provided in the allow-list.)