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Rising Malware Threats to Linux - Understanding Risks and Defenses

If you’ve been keeping up with the latest IT security news, you may have noticed the increase in the number of attacks on network security within Linux systems. Cloud Snooper, EvilGnome, HiddenWasp, QNAPCrypt, GonnaCry, FBOT, and Tycoon have become prime malware variants to be aware of as a Linux admin. . Linux is considered a highly secure operating system , but Linux users are no longer immune to malware, ransomware and other pervasive security threats. In this article, we aim to put these recent Linux attacks into perspective, provide some background on Linux malware, and shed some light on other concerns users might have. The Modern Linux Threat Landscape in a Nutshell Despite the heralded safety landscape on Linux operating systems, network security threats, including malware and viruses, have grown to be serious concerns for Linux users. Attacks in network security have targeted Linux, as threat actors hope to obtain a Return on Investment when accessing such systems. The evolution of malware research in recent years has offered superior visibility into exploits in cyber security that threaten Linux servers. A vulnerable server of any sort is an open door for data and credential theft, DDoS attacks, cryptocurrency mining, and web traffic redirection. Most significantly, it can be used to host malicious Command and Control (C&C) servers. Just over a year ago, bringing to conclusion a collaborative three-year effort, security researchers identified various OpenSSH backdoors, including the notorious Linux/Ebury backdoor, which could be used to compromise servers with dangerous malware. Simultaneously, ESET researchers exposed 21 Linux-based malware families , 12 of which were previously undocumented. In a sense, these findings confirmed an evolving, increasingly dangerous array of data and network security threats, putting Linux users and their systems at risk. A Brief History of Linux Malware The increasing prevalence of Linux malware in recent years arguably creates theillusion of a new network security threat targeting Linux systems; unfortunately, though, Linux malware has been around for quite some time. The first piece of Linux malware, dubbed Stoag, was identified in 1996. Staog was a basic virus that attempted to gain root access by attaching itself to running executables, but it did not spread very successfully and was rapidly patched. Stoag made its claim to fame as the first piece of Linux malware, but Bliss, recognized in 1997, was the first Linux malware variant to grab headlines. Similar to Stoag, Bliss was a fairly mild infection that attempted to grab permissions via compromised executables, but it could be deactivated with a simple shell switch, fortunately. Guardian Digital CEO and LinuxSecurity.com founder Dave Wreski commented on the evolution of Linux malware, “Over the years, malware targeting Linux systems has become both more sophisticated and more common; however, up until fairly recently, Linux malware was still relatively scarce and primitive compared to the variants that threatened proprietary operating systems. As of 2018, there had not yet been a single widespread Linux malware attack or virus comparable to those that frequently target Microsoft Windows - which can be attributed to a lack of root access and rapid updates to the majority of Linux vulnerabilities.” Unfortunately for Linux users, the era of complete data and network security has ended, as the Linux threat landscape has remodeled to become significantly more complex and dangerous to users. Why Is Linux Malware A Growing Concern for Administrators? Much to the dismay of Linux system administrators and users, recent years have been plagued with emerging malware campaigns targeting Linux servers. These attacks in network security demonstrated new and dangerous tactics for spreading, allowing such cloud security breaches to remain undetected prior to compromising servers. Let’s go over the main Linux malware strains that have popularized in the past couple of years. CloudSnooper CloudSnooper uses a unique combination of sophisticated techniques to sneak into Linux and Windows servers so the malware can communicate freely with command and control servers through firewalls. CloudSnooper enables threat actors to work through servers “from the inside out” and is the first example of an attack formula that combines a bypassing technique with a multi-platform payload, targeting both Windows and Linux systems. While each individual element of CloudSnooper’s Tactics, Techniques, and Procedures (TTPs) has been observed previously, these aspects have not been utilized in combination until now. Experts in cyber security trends predict that this package of TTPs will be used as blueprints for dangerous new firewall attacks that could put data and network security in the line of fire. In sophisticated exploits in cyber security utilizing CloudSnooper, hackers pawned Amazon Web Services (AWS) servers and set up a rootkit, which enabled the cybercriminals to remotely control servers. Once they did this, the threat actors funneled sensitive data from compromised Windows and Linux machines to Command and Control (C2) servers. Security researcher Willem Mouton describes the attack: “From a technical perspective, it is a thing of beauty, as well as the fact that they made it cross-platform.” EvilGnome Discovered in July 2019, EvilGnome disguises itself as a Gnome shell extension so it can remain undetected by security software while spying on desktop users. EvilGnome is delivered via a self-extractable archive created using the make self shell script, and the infection is automated with the help of an autorun argument left in the headers of the self-executable payload. When downloaded on a Linux system, the malware is capable of stealing files, taking desktop screenshots, and capturing audio recordings from the user’s microphone so they can be downloaded and utilized in other modules. EvilGnome attacks have been linked to the Gamaredon Group, a Russian AdvancedPersistent Threat (APT) group notorious for developing custom malware variants. Both hacker groups use the same hosting provider and engage with the same C2 domains. Nothing has been confirmed regarding the connection between the groups, but Linux malware experiences have been similar between EvilGnome and Gamaredon Group. Therefore, it is highly likely that these attacks on network security come from the same source. HiddenWasp In early 2019, security researchers discovered a new strain of Linux malware created by Chinese hackers, which could be used to remotely control infected systems. Dubbed HiddenWasp, this sophisticated malware consists of a trojan, a user-mode rootkit, and an initial deployment script. HiddenWasp is deployed as a second-stage payload and is capable of running terminal commands, interacting with the local filesystem, and more. HiddenWasp displays similarities to several other Linux malware families, including Azazel, ChinaZ, and Adore-ng, suggesting that some of its code may have been borrowed. Unlike common Linux malware, HiddenWasp is not focused on DDoS activity or crypto-mining. Instead, it is a trojan used solely for targeted remote control. QNAPCrypt This past summer, security researchers identified a rare instance of Linux ransomware targeting Network-Attached Storage (NAS) servers. The malware, which they named QNAPCrypt, is an ARM variant that encrypts all files; however, unlike standard ransomware, the ransom note is delivered solely as a text file without any message on the screen. Each victim is provided with a unique Bitcoin wallet, a tactic that helps conceal the identity of the attackers. Once a system is infected, the ransomware requests a wallet address and a public RSA key from the C2 before file encryption. Fortunately, this is a flaw in QNAPCrypt’s design that enables victims to temporarily block threat actors’ operations to protect further data and network security. Despite this weakness, QNAPCrypt represents the “evolution and adaptation of anattack to bypass security controls.” Unfortunately, it isn’t very common for Linux system administrators to deploy endpoint monitoring to network file servers. GonnaCry GonnaCry is an emerging Linux ransomware variant under active development in Python and C for research purposes. Lead developer Tarcisio Marinho explains the motivation behind his work: “Since the worldwide spread of the Wannacry ransomware in May 2017 affected so many countries and companies, I kept wondering: Is it really hard to mess with a company’s or a person’s life with a computer? The answer is yes, it’s possible. And ransomware is a computer virus so powerful to do so.” GonnaCry begins its work by finding the files it will encrypt. Once it has identified these, the malware starts its encryption routine and creates a desktop file that will help the decryptor access the path, key, and IV used to encrypt each file. The ransomware then frees the memory allocated by the files on the computer. GonnaCry does not rival notorious variants like WannaCry and Petya in complexity, but according to Marinho, “The basic structure is working.” FBOT FBOT is a client variant of the infamous Mirai botnet that targets Linux IoT devices. According to the “Malware Must Die!” blog, FBOT re-emerged on February 9, 2020, after a month of inactivity, offering several technical updates , including advances in its infection method and its increased propagation speed. “Malware Must Die!” reflects on the re-emergence of FBOT and the future of Linux IoT malware: “We are in an era where Linux or IoT malware is getting into better form with advantages. It is important to work together with threat intelligence and knowledge sharing to stop emerging malicious activity before it becomes a big problem for all of us later on.” Tycoon Tycoon is an emerging strain of Java-based ransomware that targets both Linux and Windows systems. This dangerous ransomware variant, which was discovered by Blackberry securityresearchers, uses a little-known file format, making it highly difficult to detect before it detonates its file-encrypting payload. The researchers who discovered Tycoon reported that this was the first time they had seen a ransomware module compiled into a Java image (JIMAGE) file format. JIMAGE files are rarely scanned by anti-malware engines, and malicious JIMAGE files stand a good chance of going undetected as a result. BlackBerry explains in a blog post , “Malware writers are constantly seeking new ways of flying under the radar. They are slowly moving away from conventional obfuscation and shifting towards uncommon programming languages and obscure data formats.” BlackBerry researchers say that they have recently observed roughly a dozen “highly targeted” Tycoon infections, and the attackers appear to carefully select their victims, favoring small- and medium-sized businesses in the software and education industries. However, as is often the case, the researchers suggest that the actual number of infections is likely much higher. Knowing the various network security threats taking control of Linux systems is vital in making sure you take care of your server to prevent cyber security vulnerabilities from being exploited. Tips & Tools for Defending Linux Servers Against Malware With attacks in network security targeting Linux servers becoming increasingly common and dangerous, defending against malware and other advanced Linux threats is more critical than ever in maintaining a secure Linux system. Here are some tips and tools to consider when securing your Linux system, all of which can mitigate cyber security vulnerabilities and provide more data and network security: Double-check all cloud configurations, as user misconfiguration and lack of visibility are the top causes of cloud security breaches. Ensure that remote access portals are properly secured. Many network-level attacks are made possible because attackers find their way in through a legitimate, insecure remoteaccess portal by impersonating a trusted source. Create a complete inventory of all devices connected to a network and update all security software used on these devices frequently. Make sure that all external-facing services are fully patched. Be aware that firewall security is not a substitute for an organization’s own cloud security measures, and security patching should be done regularly. Set special rules in your firewall to block control packets specific to Cloud Snooper. Enable multi-factor authentication on all security dashboards or control panels used internally to prevent threat actors from disabling security software in the event of an attack. Review system logs regularly. It’s rare that threat actors are able to take over servers without leaving some trace of their actions, such as log entries showing unexpected or unauthorized kernel drivers being activated. Keep in mind, however, that criminals who already have root powers can tamper with your logging configuration and the logs themselves, making it more difficult to spot malicious activity. Remember that a comprehensive, defense-in-depth approach to security is essential in protecting your system from modern, advanced exploits in cyber security. How Can I Rapidly and Accurately Identify and Eliminate Linux Malware? If malware does get downloaded on your system, being able to rapidly and accurately identify and eliminate it is critical to protecting yourself, your users, and your files. Luckily, there are various effective open-source network security toolkits that can be used to detect and remove malware on your system: Linux Malware Detect: Linux Malware Detect is a malware cloud security scanner that can be used to detect malware in shared Linux environments. It utilizes threat data from network edge intrusion detection systems to identify and extract malware that is actively being used in attacks and generates signatures for detection. This tool also derives threat data from user submissions andcommunity resources. The Rootkit Hunter & Check Rootkit: The Rootkit Hunter (Rkhunter) and Check Rootkit ( chkrootkit ) are tools that scan local systems, identifying any potentially malicious software, such as malware and viruses that mask their existence on a system. Volatility: Volatility is an open-source memory forensics cloud security framework for incident response and malware analysis. Lynis: Lynis is a command-line application that scans a local or remote system to help an auditor identify potential network security issues. Cuckoo Sandbox: Cuckoo Sandbox is an excellent privacy sandbox for malware analysis. This tool allows you to safely execute possible malware samples, and it provides a comprehensive report on the code executed. Kali Linux: Kali Linux is a Linux distribution used for penetration testing, ethical hacking, and digital forensics. The included security penetration and management tools can be used for network discovery and other research purposes, as well as to identify potential cybersecurity vulnerabilities. Kali Linux includes many of the other network security. Malware as a Business The malware market is rapidly expanding and evolving, forcing the security industry to keep pace. The success of this market drives rapid innovation, perpetuating growth and encouraging further malicious activity. Threat actors are cr eating and utilizing increasingly agile and sophisticated malware strains in their attacks on network security, challenging engineers to build stronger defenses against them. Traditional antivirus software is no longer effective in detecting and combating advanced, modern exploits in cyber security. Protecting against today’s sophisticated malware threats requires a comprehensive, defense-in-depth approach to digital security. According to Verizon, 92.4 percent of malware is delivered via email . Thus, an effective email security strategy is imperative in preventing dangerous and costly infections. Malware is a seriousnetwork security threat to all businesses, as an infection can result in significant downtime, recovery costs, and reputation damage. Small businesses face a heightened risk because they often lack the resources and funding necessary to support a full-time IT department. Guardian Digital EnGarde Cloud Email Security provides fully managed, multi-layered email protection against malware, phishing, and other persistent email-borne network security threats. Through a transparent, collaborative, open-source approach to software development, Guardian Digital is able to access and provide resources and tools from an innovative global community in a way that no other vendor can. This approach, combined with decades of industry experience and engineering expertise, enables Guardian Digital to offer flexible enterprise-grade solutions to businesses of all sizes at competitive prices. Key benefits of EnGarde’s protection include: Advanced real-time defenses against social engineering and impersonation attacks Email encryption and sender authentication protocols detect fake “From” addresses and block them automatically Neutralizes network security threats associated with malicious attachments and links A scalable cloud-based system simplifies deployment and increases availability Tighter data and network security, adaptive implementation, and eliminated risk of vendor lock-in through the use of a community-powered open-source approach to software development Professional engineering services, as Guardian Digital expert engineers take the time to learn about each client’s key assets, operations, and specific needs Passionate, knowledgeable, around-the-clock customer support services Our Final Thoughts on Protecting Against Linux Malware Despite the growing number of data and network security threats targeting Linux systems, there is still solid evidence that Linux is secure by design. There is a vibrant worldwide community that provides strong arguments and seeksto improve security posture by scrutinizing all resources introduced, allowing companies to have more transparency with their open-source code once it is accessible to all operating systems intended. Because of the workers constantly reviewing the source code in Linux kernels, cyber security vulnerabilities are identified and remedied faster than flaws that exist in the opaque source code of proprietary operating systems like Microsoft Windows. Threat actors recognize and exploit such weaknesses, directing the majority of their attacks at proprietary software, platforms, and operating systems. According to ESET security researchers, the Operation Windigo botnet, which uses Cdorked web servers to compromise Apache and more, has been detected in 26,000 infections since May 2013. The infamous ZeroAccess Windows-based botnet had infected nearly two million Windows PCs before it was taken down in December 2013. The digital threat landscape is rapidly evolving to become more advanced and dangerous. While the majority of attacks in network security still victimize proprietary operating systems, threat actors are experimenting with newer targets like Linux. Linux users should undoubtedly be aware of the growing risk that their systems face and recognize that as this new decade unfolds, prioritizing system data and network security and maintenance is more critical than ever. In many cases, malware attacks can be attributed to administration issues and cyber security vulnerabilities in individual accounts instead of to poor operations. Guardian Digital CEO Dave Wreski states, “Although it may be easy to blame the rise in Linux malware in recent years on security vulnerabilities in the operating system as a whole, this is unfair and largely untrue. The majority of malware exploits on Linux systems can be attributed to misconfigured servers.” On a broader scale, the rise of Linux malware should serve as a wake-up call for the security industry to allocate more resources to detect these networksecurity threats. As Linux malware continues to become more complex, even more common malware will target Linux frequently and still fly under the radar. . Linux is considered a highly secure operating system, but Linux users are no longer immune to malwar. you’ve, keeping, latest, security, noticed, increase. . Brittany Day

Mar 19, 2025 •

Brittany Day

Zoho Patch Management Solution1 1 Esm H240

network securitymalwaresecurity threats

ManageEngine Patch Manager Plus Protecting Linux From Malware Threats

Linux is widely recognized for its impressive levels of security and stability offered to admins and organizations. However, the popular open-source operating system is not immune to malware, viruses, and other network security threats. . In fact, attackers now view the OS as a viable target due to its rapidly growing user base, its high-value servers, and the devices it powers worldwide. The number of new Linux malware variants reached a record high in the first half of 2022, as nearly 1.7 million samples were discovered. Threat actors frequently exploit unpatched cyber security vulnerabilities in software and applications to gain access to corporate networks, enable malicious code, and compromise critical systems. Thus, having a reliable patch management strategy in place is crucial in identifying and remediating network security issues before they are exploited by adversaries in damaging malware attacks. Despite the critical importance of effective data and network security, too many organizations still neglect to implement the Linux patch management best practices. This could be due to limited time and resources, the threat of numerous cyber security vulnerabilities throughout an entire network, and minimal opportunities to prioritize such risks prior to them resulting in attacks on network security. In this article, we introduce an automated Linux patch management solution that can help your organization overcome these obstacles, defend against Linux malware and other malicious network security threats, and maintain complete visibility and control over your system. Why Is Linux Malware A Serious & Growing Threat for Businesses? The evolution of malware research has provided superior visibility into attacks in network security threatening Linux servers. Just like any other software, unpatched cybersecurity vulnerabilities in Linux can be exploited by malware operators to gain unauthorized access to a system. A vulnerable server is an open door for data and credential theft, DistributedDenial-of-Service (DDoS) attacks, cryptocurrency mining, and web traffic redirection, leaving it susceptible to becoming a host for Malicious Command and Control (C&C) servers. Anandraj Paul, Head of Development for Endpoint Security at ManageEngine, elaborates, “Unpatched vulnerabilities can also be leveraged to install backdoors or create botnets which can be used to launch further attacks or steal resources from the infected Linux system. These flaws are often targeted by automated attacks that spread rapidly and infect many systems within a short period of time.” In recent years, the Linux malware network security threats have become more sophisticated , with attackers leveraging advanced techniques such as fileless malware , weaponized documents, code injection, and Zero-Day attacks that can compromise systems. With the rise of cryptocurrency, mining malware, ransomware , and banking trojans, Linux is a target for gaining financial data through servers, desktops, and IoT devices like routers, cameras, and smart appliances, all of which are often more vulnerable to attacks since due to cybersecurity vulnerabilities and weak data and network security practices. These network security threats have magnified the importance of having the right technology and systems in place to detect and remediate network security issues that these advanced malware attacks exploit. With the rapid evolution seen in recent years, Linux malware is now harder to detect and mitigate, so cybersecurity trends need to be implemented immediately. Modern malware can evade detection by traditional antivirus solutions through the use of advanced techniques such as polymorphism, rootkits, and encryption. Rangaraj Santhanam, Head of Linux Development for Endpoint Security at ManageEngine, explains, “Threat actors are also increasingly using Linux malware to specifically target organizations, industries, and even individuals. These targeted attacks can be more difficult to detect because they are customized to evade securitymeasures that the target may have in place.” Linux implementation into business-critical systems and on the cloud has increased the attack surface for Linux malware. Linux security expert and LinuxSecurity.com Founder Dave Wreski, warns, “It is critical that organizations are able to find and fix unpatched security bugs before cybercriminals have the opportunity to exploit them to infect devices and systems with harmful malware that can lead to downtime and compromise. Implementing an automated patch management and compliance solution is an efficient and effective way to ensure that security bugs aren’t left unaddressed.” Comprehensive, Automated Protection Against Unpatched Security Vulnerabilities Leaving Businesses Susceptible to Attack ManageEngine Patch Manager Plus is a comprehensive security patching solution for Linux, Windows, and macOS that offers automated patch deployment for endpoints. It's available both on-premises and on the cloud. With Patch Manager Plus in use, businesses can scan endpoints to detect missing patches, test patches, automate and customize patch deployment, make use of pre-built, tested, ready-to-deploy packages, and gain better visibility and control by conducting powerful audits and accessing comprehensive reports. ManageEngine Patch Manager Plus addresses growing Linux malware threats by: Patching known cybersecurity vulnerabilities in real time for admins before attackers can exploit them. Automating patch management processes, from detecting, testing, approving, and deploying patches to ensure that network security issues are consistently patched across all Linux systems to reduce the quantity of missed or delayed patches and to negate the possibility of any manual error. Integrating cloud security scanners that identify and patch vulnerabilities rapidly, all from a single console. Patching for Linux OS and third-party applications, including enterprise-use ones like Red Hat, SUSE, and Ubuntu, and more general distros like Debian, CentOS, Pardus,Oracle Linux, and Rocky Linux. Improving compliance by utilizing in-depth reporting capabilities to meet regulatory requirements for patching and maintaining system data and network security. Here are the benefits of using Patch Manager Plus to protect your cybersecurity vulnerabilities: Blazing speed: Automate patch management to get more endpoints patched in less time. Flexibility: Gain the ability to customize deployment policies to meet your enterprise's patching needs. Reliability: Secure networks by applying timely patches to OS and applications. Compliance: Achieve 100% patch compliance status across all systems. Visibility: Use powerful audits and reporting to better analyze and fix network security issues faster. Patch Manager Plus includes reporting capabilities like: System Health Reports: Patch Manager Plus classifies the systems in the network based on their vulnerability: “Highly vulnerable,” “Healthy,” and “Health Not Available.” Leveraging this report, admins can have a holistic view of the health status of their systems during audits. System Compliance Graph: Admins can get an overview of the systems that are compliant or non-compliant in the network. Missing Patches by Severity: Right from the console, admins can access an overview of the patches missing in the network based on their severity: Critical, Important, Moderate, Low, and Unrated. This ensures timely remediation and prioritization of cybersecurity vulnerabilities based on their severity. For these reasons, ManageEngine Patch Manager Plus meets all of the LinuxSecurity team’s criteria for an effective and efficient Linux patch management solution that organizations can deploy to protect against malware and other network security threats that exploit unpatched problems. Final Thoughts on Patch Manager Plus’ Linux Malware Protection Linux malware is a serious and growing network security threat but can be prevented with responsible administration and the implementation of acomprehensive patch management and compliance solution like ManageEngine Patch Manager Plus. Wreski concludes, “The majority of malware attacks on Linux systems can be attributed to misconfigured servers and unpatched vulnerabilities. Having a patch management solution in place that you can count on to fix security bugs before they are exploited in damaging cyberattacks is of critical importance in protecting against Linux malware and improving your organization's overall security posture.” Sign up for a free 30-day trial of ManageEngine Patch Manager Plus and improve your security posture through your patch management and compliance strategies to defend an unlimited number of endpoints against Linux malware and other dangerous, pervasive attacks in network security. . Fortify Unix platforms against emerging vulnerabilities via automated update solutions for strong antivirus defense and safety.. Malware Management, Patch Solutions, Network Security Products, Linux Protection Strategies, Cybersecurity Compliance. . Brittany Day

May 01, 2023 •

Brittany Day

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network securitysecurity threatssecurity applications

Maximizing IT Investment Returns And Enhancing Security Solutions

In a time where budgets are constrained and Internet threats are on the rise, it is important for organizations to invest in network security applications that will not only provide them with powerful functionality but also a rapid return on investment.. In most organizations IT success is generally calculated through effectiveness, resource usage and, most importantly, how quickly the investment can be returned. To correctly quantify the ROI of information technology, organizations usually measure cost savings and increased profits since the initial implementation. Additionally, ROI can also be affected based on the overall impact the investment has on employee productivity and overall work environment of the company. With regards to security IT purchases, however, it is much more difficult to calculate an accurate ROI. When it comes to securing a corporate network, it is nearly impossible to assign a dollar amount to the level of security necessary to keep organizations safe from increasing Internet threats. Making incorrect decisions in this area could lead to an exhaustion of resources or an oversight in specific areas needing protection, potentially resulting in debilitating and costly security breaches. To avoid such situations, it is essential that all organizations invest in a solid infrastructure with flexibility and room for future expansion. In addition, leveraging open source solutions consistently deliver greater ROI, substantially increase security protection, and deliver better flexibility. Such an investment will fundamentally change how information is managed and present results in a more quantifiable metric when presenting to them management. -Dave Wreski, CEO Guardian Digital, Inc. To address increasing threats, organizations must evaluate IT performance by considering investment, efficiency, and security.. Network Security, IT Success, Open Source Investments, Risk Assessment. . Anthony Pell

Feb 13, 2010 •

Anthony Pell

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Rising Malware Threats to Linux - Understanding Risks and Defenses

ManageEngine Patch Manager Plus Protecting Linux From Malware Threats

Maximizing IT Investment Returns And Enhancing Security Solutions

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