31 May 2024

RedTail Crypto-Mining Malware Exploiting Palo Alto Networks Firewall Vulnerability

In the ever-evolving landscape of cybersecurity threats, a new adversary has emerged, utilizing advanced techniques and sophisticated strategies to evade detection and exploit critical vulnerabilities. The RedTail cryptocurrency mining malware, initially documented in early 2024, has recently upped its game by targeting a significant vulnerability in Palo Alto Networks firewalls. This blog delves into the intricacies of this malware, the nature of the vulnerabilities it exploits, and the broader implications for cybersecurity.

RedTail Crypto-Mining Malware: An Overview

Origin and Initial Discovery

RedTail was first brought to light in January 2024 by security researcher Patryk Machowiak. The malware quickly garnered attention due to its use of the infamous Log4Shell vulnerability (CVE-2021-44228), which allowed attackers to deploy malware on Unix-based systems. Over time, RedTail has evolved, incorporating a range of vulnerabilities into its exploit toolkit and refining its evasion and persistence mechanisms.

Evolution and Expansion

From its initial discovery, RedTail has shown a remarkable ability to adapt and expand its capabilities. In March 2024, Barracuda Networks disclosed details of cyber attacks that exploited flaws in SonicWall (CVE-2019-7481) and Visual Tools DVR (CVE-2021-42071) to install Mirai botnet variants. RedTail was also found exploiting vulnerabilities in ThinkPHP (CVE-2018-20062) to deploy its payload. These developments underscore the malware's versatility and the continuous efforts by its developers to refine and expand its capabilities.

Exploiting the Palo Alto Networks Firewall Vulnerability

CVE-2024-3400: A Critical Flaw

The most recent and significant development in the RedTail saga involves the exploitation of a critical vulnerability in Palo Alto Networks firewalls, identified as CVE-2024-3400. This vulnerability, which has been assigned a CVSS score of 10.0, is a severe security flaw that allows unauthenticated attackers to execute arbitrary code with root privileges on the firewall. Despite being patched, the rapid incorporation of this vulnerability into RedTail's arsenal highlights the agility and responsiveness of the threat actors behind the malware.

Detailed Exploitation Process

The exploitation process of CVE-2024-3400 by RedTail is both sophisticated and streamlined. Upon successful exploitation, the malware executes commands designed to retrieve and run a bash shell script from an external domain. This script is responsible for downloading the RedTail payload, which is customized based on the CPU architecture of the targeted system. This level of customization demonstrates the attackers' deep understanding of different system architectures and their ability to tailor their payloads for maximum effectiveness.

Advanced Techniques and Sophistication

Anti-Analysis and Evasion Techniques

One of the defining characteristics of RedTail is its advanced anti-analysis and evasion techniques. The latest version of the malware employs multiple strategies to evade detection and complicate analysis. Notably, RedTail forks itself multiple times, a tactic designed to hinder analysis by debugging its process. This forking mechanism makes it difficult for security researchers to isolate and analyze the malware's behavior. Additionally, RedTail actively scans for and kills any instance of the GNU Debugger it encounters, further complicating efforts to analyze its operations.

Encrypted Mining Configuration

Another significant advancement in RedTail's evolution is the inclusion of an encrypted mining configuration used to launch the embedded XMRig miner. This configuration file, which does not contain a cryptocurrency wallet address, suggests that the threat actors have shifted to using private mining pools or pool proxies. This shift allows them greater control over mining outcomes, despite the increased operational and financial costs associated with running a private mining operation. The use of private mining pools also complicates efforts to track and disrupt the malware's operations, as traditional methods of tracing cryptocurrency transactions are rendered ineffective.

Broader Implications for Cybersecurity

Persistent and Sophisticated Threat

The sophistication and persistence of RedTail highlight the growing threat posed by cryptocurrency mining malware. Unlike traditional malware, which may be designed to steal data or cause disruption, cryptocurrency mining malware like RedTail is focused on monetizing the compromised systems by utilizing their processing power to mine cryptocurrencies. This focus on financial gain drives the continuous evolution and refinement of the malware, as seen with RedTail's rapid adoption of new vulnerabilities and advanced evasion techniques.

Attribution and Potential Links

While the exact identity of the threat actors behind RedTail remains unknown, there are indications that the tactics employed by the malware bear similarities to those used by the North Korea-linked Lazarus Group. Known for orchestrating wide-ranging cyber attacks for financial gain, the Lazarus Group has a history of using private crypto-mining pools, a tactic now seen with RedTail. The level of sophistication and investment required to develop and operate RedTail also suggests the possibility of nation-state sponsorship. The use of private mining pools, advanced evasion techniques, and rapid incorporation of new vulnerabilities all point to a well-resourced and highly skilled group behind the malware.

The Importance of Vigilance and Collaboration

Ensuring System Security

In light of the threats posed by RedTail, organizations must take proactive measures to secure their systems. For those using Palo Alto Networks firewalls, it is crucial to ensure that the latest patches have been applied to mitigate the CVE-2024-3400 vulnerability. Regular updates and patches are essential to protect against the ever-evolving landscape of cybersecurity threats.

Continuous Monitoring and Incident Response

Organizations should also implement continuous monitoring and robust incident response strategies to detect and respond to potential compromises. Advanced threat detection systems, coupled with comprehensive logging and monitoring, can help identify unusual activity indicative of a compromise. Swift incident response is critical to contain and mitigate the impact of any breach, minimizing downtime and financial loss.

Collaboration Among Cybersecurity Community

The ongoing evolution of RedTail highlights the need for collaboration among the cybersecurity community. Sharing threat intelligence and insights can help researchers and organizations stay ahead of emerging threats and develop effective countermeasures. Industry forums, conferences, and information-sharing platforms play a crucial role in fostering collaboration and enhancing the collective defense against sophisticated malware like RedTail.

Investing in Advanced Security Solutions

Given the advanced techniques employed by RedTail, investing in advanced security solutions is imperative. Endpoint detection and response (EDR) systems, advanced firewalls, and intrusion detection systems (IDS) can provide additional layers of defense against sophisticated threats. Machine learning and artificial intelligence (AI) based security solutions can also enhance threat detection capabilities by identifying patterns and anomalies indicative of malicious activity.


As a cybersecurity firm dedicated to protecting organizations from emerging threats, DigiALERT recognizes the significant danger posed by the RedTail cryptocurrency mining malware. This sophisticated malware has not only exploited critical vulnerabilities in Palo Alto Networks firewalls but has also demonstrated advanced evasion and persistence techniques, underscoring the increasing sophistication of cyber threats in today's digital landscape.

The rapid adoption of the CVE-2024-3400 vulnerability by RedTail, along with its use of private crypto-mining pools and advanced anti-analysis strategies, highlights the agility and resourcefulness of the threat actors behind it. The potential links to nation-state actors like the North Korea-linked Lazarus Group further emphasize the complexity and scale of the threat.

For organizations, especially those using Palo Alto Networks firewalls, it is imperative to ensure that all systems are updated with the latest security patches. Proactive measures, including continuous monitoring, robust incident response plans, and investments in advanced security solutions, are crucial to defending against such sophisticated threats.

At DigiALERT, we are committed to helping our clients stay ahead of these evolving threats. By leveraging our expertise in cybersecurity and fostering collaboration within the security community, we strive to provide comprehensive protection against malware like RedTail. Our goal is to safeguard your digital assets, ensuring a secure and resilient cyber environment.

The RedTail incident serves as a reminder of the dynamic nature of cyber threats and the importance of maintaining a proactive and adaptive security posture. Together, through vigilance, innovation, and collaboration, we can effectively counteract these threats and secure the digital future.

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