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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 8 min read * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Bryan Lee](https://unit42.paloaltonetworks.com/author/bryanlee/) * [Rob Downs](https://unit42.paloaltonetworks.com/author/rob-downs/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:February 12, 2016 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Malware](https://unit42.paloaltonetworks.com/category/malware/) * [Threat Actor Groups](https://unit42.paloaltonetworks.com/category/threat-actor-groups/) * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [Fighting Ursa](https://unit42.paloaltonetworks.com/tag/fighting-ursa/) * [Fysbis](https://unit42.paloaltonetworks.com/tag/fysbis/) * [Linux](https://unit42.paloaltonetworks.com/tag/linux/) * [Sofacy](https://unit42.paloaltonetworks.com/tag/sofacy/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/a-look-into-fysbis-sofacys-linux-backdoor/?pdf=download&lg=en&_wpnonce=9455982592 "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/a-look-into-fysbis-sofacys-linux-backdoor/?pdf=print&lg=en&_wpnonce=9455982592 "Click here to print") Share![Down 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Their targets have spanned all across the world, with a focus on government, defense organizations and various Eastern European governments. There have been numerous reports on their activities, to the extent that a [Wikipedia](https://en.wikipedia.org/wiki/Sofacy_Group) entry has even been created for them. From these reports, we know that the group uses an abundance of tools and tactics, ranging across zero-day exploits targeting common applications such as Java or Microsoft Office, heavy use of spear-phishing attacks, compromising legitimate websites to stage watering-hole attacks, and targeting over a variety of operating systems -- Windows, OSX, Linux, even mobile iOS. The Linux malware Fysbis is a preferred tool of Sofacy, and though it is not particularly sophisticated, Linux security in general is still a maturing area, especially in regards to malware. In short, it is entirely plausible that this tool has contributed to the success of associated attacks by this group. This blog post focuses specifically on this Linux tool preferred by Sofacy and describes considerations and implications when it comes to Linux malware. ### Malware Assessment Fysbis is a modular Linux trojan / backdoor that implements plug-in and controller modules as distinct classes. For reference, some vendors categorize this malware under the Sednit attacker group naming designation. This malware includes both 32-bit and 64-bit versions of [Executable and Linking Format (ELF)](https://www.linuxjournal.com/article/1059) binaries. Additionally, Fysbis can install itself to a victim system with or without root privileges. This increases the options available to an adversary when it comes to selecting accounts for installation. Summary information for the three binaries we analyzed follows: |-----------------------|--------------------------------------------------------------------------------------| | MD5 | 364ff454dcf00420cff13a57bcb78467 | | SHA-256 | 8bca0031f3b691421cb15f9c6e71ce19335 5d2d8cf2b190438b6962761d0c6bb | | ssdeep | 3072:n+1R4tREtGN4qyGCXdHPYK9l0H786 O26BmMAwyWMn/qwwiHNl:n+1R43QcIL XdF0w6IBmMAwwCwwi | | Size | 141.2 KB (144560 bytes) | | Type | ELF 64-bit (stripped) | | Install as root | /bin/rsyncd | | Root install desc | synchronize and backup service | | Install as non-root | ~/.config/dbus-notifier/dbus-inotifier | | Non-root install desc | system service d-bus notifier | | C2 | azureon-line\[.\]com (TCP/80) | | Usage Timeframe | Late 2014 | Table 1: Sample 1 - Late 2014 Sofacy 64-bit Fysbis |-----------------------|-------------------------------------------------------------------------------------------------------| | MD5 | 075b6695ab63f36af65f7ffd45cccd39 | | SHA-256 | 02c7cf55fd5c5809ce2dce56085ba43795f2 480423a4256537bfdfda0df85592 | | ssdeep | 3072:9ZAxHANuat3WWFY9nqjwbuZf454U NqRpROIDLHaSeWb3LGmPTrIW33HxIajF: 9ZAxHANJAvbuZf454UN+rv eQLZPTrV3Z | | Size | 175.9 KB (180148 bytes) | | Type | ELF 32-bit (stripped) | | Install as root | /bin/ksysdefd | | Root install desc | system kernel service defender | | Install as non-root | ~/.config/ksysdef/ksysdefd | | Non-root install desc | system kernel service defender | | C2 | 198.105.125\[.\]74 (TCP/80) | | Usage Timeframe | Early 2015 | Table 2: Sample 2 - Early 2015 Sofacy 32-bit Fysbis |-----------------------|-------------------------------------------------------------------| | MD5 | e107c5c84ded6cd9391aede7f04d64c8 | | SHA-256 | fd8b2ea9a2e8a67e4cb3904b49c789d57ed 9b1ce5bebfe54fe3d98214d6a0f61 | | ssdeep | 6144:W/D5tpLWtr91gmaVy+mdckn6BCUd c4mLc2B9:4D5Lqgkcj+ | | Size | 314.4 KB (321902 bytes) | | Type | ELF 64-bit (not stripped) | | Install as root | /bin/ksysdefd | | Root install desc | system kernel service defender | | Install as non-root | ~/.config/ksysdef/ksysdefd | | Non-root install desc | system kernel service defender | | C2 | mozilla-plugins\[.\]com (TCP/80) | | Usage Timeframe | Late 2015 | Table 3: Sample 3 - Late 2015 Sofacy 64-bit Fysbis Overall, these binaries are assessed as low sophistication, but effective. They epitomize the grudging reality that Advanced Persistent Threat (APT) actors often don't require advanced means to affect their objectives. Rather, these actors more often than not hold their advanced malware and zero day exploits in reserve and employ just enough resources to meet their goals. It is only fair that defenders use any shortcuts or tricks at their disposal to shorten the amount of time it takes to assess threats. In other words, defenders should always look for ways to work smarter before they have to work harder. #### Getting the Most Out of Strings Binary strings alone revealed a good amount about these files, increasing the efficacy of activities such as static analysis categorization (e.g., [Yara](https://plusvic.github.io/yara/)). One example of this is Fysbis installation and platform targeting information for the samples in Table 1 and Table 2. [![sofacy](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy-500x172.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy.png) Figure 1: Sofacy Fysbis installation and platform targeting found in strings In this case, we can see the binary installation path and local reconnaissance to determine which flavor of Linux the malware is running. This is followed by a number of Linux shell command style commands related to the malware establishing persistence. Another example of easily obtained information from these samples is capability based. [![sofacy2](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy2-500x543.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy2.png) Figure 2: Sofacy Fysbis capability related leakage through strings Figure 2 shows interactive status / feedback strings that can give a defender an initial profile of capabilities. In addition to contributing to static analysis detections, this can be useful as a starting point for further incident response prioritization and qualification of the threat. #### Symbolic Information Can Shorten Analysis Time Interestingly, the most recent ELF 64-bit binary we analyzed (Table 3) was not stripped prior to delivery, which offered additional context in the form of symbolic information. Defenders more familiar with Windows [Portable Executable (PE)](https://msdn.microsoft.com/en-us/library/ms809762.aspx) binaries can equate this with compilation of a Debug version versus a Release version. For comparison, if we were to inspect Fysbis "RemoteShell" associated strings in one of the stripped variants, we would only see the following: [![sofacy3](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy3-500x24.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy3.png) Figure 3: Sofacy Fysbis stripped binary string references to RemoteShell capability Compare this with what is available from the non-stripped variant: [![sofacy4](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy4-500x222.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy4.png) Figure 4: Sofacy Fysbis non-stripped binary strings referenes to RemoteShell capability Little static analysis gifts like these can help to speed defender enumeration of capabilities and -- more importantly -- further contribute to correlation and detection across related samples. Additionally, this latest sample demonstrated minor evolution of the threat, most notably in terms of obfuscation. Specifically, both samples in Table 1 and Table 2 leaked installation information in the clear within binary strings. This was not the case with the sample in Table 3. Taking a closer look at this non-stripped binary using a disassembler, the following corresponds to decoding malware installation information for a root-privilege account. [![sofacy5](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy5-500x114.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy5.png) Figure 5: Assembly code view of Sample 3 installation decoding In this case, the symbolic information hints at the method used for decoding, with references to mask, path, name, and info byte arrays. [![sofacy6](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy6-500x378.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy6.png) Figure 6: Assembly view of Sample 3 root installation related byte arrays As it turns out, the referenced byte mask is applied to the other byte arrays using a rolling double-XOR algorithm to construct malware installation paths, filenames, and descriptions for a Linux root account. Corresponding INSTALLUSER byte arrays exist, which facilitate the non-root installation for the trojan. The same masking method is also used by the binary to decode malware configuration C2 information, further showcasing how a little symbolic information can go a long way towards completeness and higher confidence in assessment of a malware sample. If you would like to learn more about how Fysbis works, the samples analyzed remain fairly consistent with the sample analysis found [here](https://vms.drweb.com/virus/?i=4276269). ### Infrastructure Analysis As Unit 42 has discussed in depth in other blog articles, we have observed that adversaries in general are seemingly hesitant in changing their infrastructure. This may be due to not wanting to commit additional resources, or simply a matter of retaining familiarity for the sake of timeliness. In either case, we see the same type of behavior here with the Fysbis samples in use by Sofacy. The oldest sample (Table 1), was found to beacon to the domain azureon-line\[.\]com, which had already been widely publicized as a known command and control domain for the Sofacy group. Using passive DNS, we can see that two of the original IPs this domain resolved to, 193.169.244\[.\]190 and 111.90.148\[.\]148 also mapped to a number of other domains that had been in use by the Sofacy group during that time period. [![sofacy7](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy7-500x549.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy7.png) Figure 7: Sample 1 C2 resolutions The first of the newer samples (Table 2), continues the trend and beacons to an IP also widely associated with the Sofacy group, 198.105.125\[.\]74. This IP has been mostly associated with the tool specifically known as CHOPSTICK, which can be read about [here](https://www2.fireeye.com/rs/fireye/images/rpt-apt28.pdf). [![sofacy8](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy8-500x221.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy8.png) Figure 8: Sample 2 C2 resolutions The newest sample (Table 3), introduces a previously unknown command and control beacon to mozilla-plugins\[.\]com. This activity aligns with the previously observed Sofacy group tactic of integrating legitimate company references into their infrastructure naming convention. Neither this new domain nor the IP it resolves to have been observed in the past, indicating that the sample in Table 3 may be associated with a newer campaign. Comparing this sample's binary with the other two however, shows there are significant similarities on the code level as well as in terms of shared behavior. [![sofacy9](http://blog.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy9-500x418.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2016/02/sofacy9.png) Figure 9: Sample 3 C2 resolutions ### Conclusion Linux is used across business and home environments and appears in a variety of form factors. It is a preferred platform within data centers and the cloud for businesses, as well as an ongoing favorite when it comes to a majority of Internet-facing web and application servers. Linux is also at the foundation of Android devices and a number of other embedded systems. The value proposition of Linux -- especially when it comes to its use in the enterprise -- can be broken out into three perceived benefits: lower total cost of ownership (TCO), security, and feature set. While numbers and comparison alone can contribute to measurement of TCO and feature set, security requires further qualification. Expertise in the Linux platform is highly sought after across all industries for multiple disciplines, from system administration to big data analytics to incident response. The majority of businesses still maintain Windows-heavy user environments where certain core infrastructure components also operate under Windows servers (e.g., Active Directory, SharePoint, etc.). This means, from a practical perspective, most of a business's focus remains on supporting and protecting Windows assets. Linux remains a mystery to a number of enterprise IT specialists --most critically for network defenders. Identifying and qualifying potential incidents requires a familiarity with what constitutes normal operation in order to isolate anomalies. The same is true for any other asset in an environment, normal operation is entirely dependent on a given asset's role / function in the enterprise. Lack of expertise and visibility into non-Windows platforms combine in some environments to present significant risks against an organization's security posture. As a recent caution, the Linux vulnerability described under [CVE-2016-0728](https://www.pcworld.com/article/3023870/security/linux-kernel-flaw-endangers-millions-of-pcs-servers-and-android-devices.html) further demonstrates the potential breadth of real-world risks to associated platforms. A natural extension of this exposure is increased targeting by both dedicated and opportunistic attackers across various malicious actor motivations. Despite the lingering belief (and false sense of security) that Linux inherently yields higher degrees of protection from malicious actors, Linux malware and vulnerabilities do exist and are in use by advanced adversaries. To mitigate associated risks requires tailored integration of the people, processes, and technology in support of prevention, monitoring, and detection within an environment. Linux malware detection and prevention is not prevalent at this time, but Palo Alto Networks customers are protected through our next-generation security platform: * IPS signature 14917 deployed to identify and prevent command and control activity * The C2 domains and files mentioned in this report are blocked in our Threat Prevention product. ### Indicators |-----------|--------------------------------------------------------------------------------------------------------| | **Type** | **Value** | | MD5 | 364ff454dcf00420cff13a57bcb78467 | | SHA256 | 8bca0031f3b691421cb15f9c6e71ce193 355d2d8cf2b190438b6962761d0c6bb | | ssdeep | 3072:n+1R4tREtGN4qyGCXdHPYK9l 0H786O26BmMAwyWMn/qwwiHNl:n +1R43QcILXdF0w6IBmMAwwCwwi | | MD5 | 075b6695ab63f36af65f7ffd45cccd39 | | SHA-256 | 02c7cf55fd5c5809ce2dce56085ba437 95f2480423a4256537bfdfda0df85592 | | ssdeep | 3072:9ZAxHANuat3WWFY9nqjwbuZf 454UNqRpROIDLHaSeWb3LGmPTrI W33HxIajF:9ZAxHANJAvbuZf454UN +rv eQLZPTrV3Z | | MD5 | e107c5c84ded6cd9391aede7f04d64c8 | | SHA-256 | fd8b2ea9a2e8a67e4cb3904b49c789d 57ed9b1ce5bebfe54fe3d98214d6a0f61 | | ssdeep | 6144:W/D5tpLWtr91gmaVy+mdckn6 BCUdc4mLc2B9:4D5Lqgkcj+ | | Path | /bin/rsyncd | | Path Desc | synchronize and backup service | | Path | ~/.config/dbus-notifier/dbus-inotifier | | Path Desc | system service d-bus notifier | | Path | /bin/ksysdefd | | Path | ~/.config/ksysdef/ksysdefd | | Path Desc | system kernel service defender | | C2 | azureon-line\[.\]com | | C2 | 198.105.125\[.\]74 | | C2 | mozilla-plugins\[.\]com | | C2 | Mozillaplagins\[.\]com | Back to top ### Tags * [Fighting Ursa](https://unit42.paloaltonetworks.com/tag/fighting-ursa/ "Fighting Ursa") * [Fysbis](https://unit42.paloaltonetworks.com/tag/fysbis/ "Fysbis") * [Linux](https://unit42.paloaltonetworks.com/tag/linux/ "Linux") * [Sofacy](https://unit42.paloaltonetworks.com/tag/sofacy/ "Sofacy") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: NanoCoreRAT Behind an Increase in Tax-Themed Phishing E-mails](https://unit42.paloaltonetworks.com/nanocorerat-behind-an-increase-in-tax-themed-phishing-e-mails/ "NanoCoreRAT Behind an Increase in Tax-Themed Phishing E-mails") ### Related Articles * [The Machine With Many Faces: Post-Exploitation Identity Misuse in SPIFFE/SPIRE](https://unit42.paloaltonetworks.com/kubernetes-spiffe-spire-identity-spoofing/ "article - table of contents") * [Kimwolf v7: An Evolution of the Kimwolf Botnet](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/ "article - table of contents") * [2026 World Cup: Discussing The World's Biggest Game's Attack Surface](https://unit42.paloaltonetworks.com/fifa-world-cup-attack-surface/ "article - table of contents") ## Related Malware Resources ![Pictorial representation of a magnifying glass illuminating a glowing orange circular digital circuit interface on a dark, high-tech background.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/04_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) September 16, 2026 [#### Atomic macOS (AMOS) Stealer Activity](https://unit42.paloaltonetworks.com/atomic-macos-amos-stealer-activity/) * [MacOS](https://unit42.paloaltonetworks.com/tag/macos/ "macOS") * [Threat intelligence](https://unit42.paloaltonetworks.com/tag/threat-intelligence/ "threat intelligence") * [Unit 42](https://unit42.paloaltonetworks.com/tag/unit-42/ "Unit 42") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/atomic-macos-amos-stealer-activity/ "Atomic macOS (AMOS) Stealer Activity") ![Pictorial representation of post-exploitation identity misuse in SPIFFE/SPIRE. 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A vibrant cityscape with silhouettes of numerous people walking along a bustling street. The scene is illuminated by bright urban lights and digital-like particles, creating a dynamic and futuristic atmosphere.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/AdobeStock_768915868-2-1-786x373.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) September 3, 2026 [#### Attackers Expose Ongoing AI Tool Use Targeting Organizations in Latin America](https://unit42.paloaltonetworks.com/ai-tool-use-targeting-latam-orgs/) * [Agentic AI](https://unit42.paloaltonetworks.com/tag/agentic-ai/ "Agentic AI") * [ChatGPT](https://unit42.paloaltonetworks.com/tag/chatgpt/ "ChatGPT") * [CL-CRI-1131](https://unit42.paloaltonetworks.com/tag/cl-cri-1131/ "CL-CRI-1131") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-tool-use-targeting-latam-orgs/ "Attackers Expose Ongoing AI Tool Use Targeting Organizations in Latin America") ![Pictorial representation of vishing campaigns in Microsoft Teams. A digital image of a skull formed by blue binary code on a black background, with scattered ones and zeros and digital noise, symbolizes how stealthy prompt injection attacks can exploit AI logic to bypass security controls.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/01_Malware_Category_1920x900-5-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 31, 2026 [#### Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/) * [Cloaked Ursa](https://unit42.paloaltonetworks.com/tag/cloaked-ursa/ "Cloaked Ursa") * [Entra ID](https://unit42.paloaltonetworks.com/tag/entra-id/ "Entra ID") * [Microsoft Teams](https://unit42.paloaltonetworks.com/tag/microsoft-teams/ "Microsoft Teams") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/ "Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams") ![Pictorial representation of AI-enabled malware. A vibrant digital interface displaying various icons and graphs, resembling a futuristic network or data analysis dashboard. The scene is illuminated with glowing lights and patterns.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/AdobeStock_1270203474-2-1-786x368.png) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 25, 2026 [#### The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/) * [Backdoor](https://unit42.paloaltonetworks.com/tag/backdoor/ "backdoor") * [Bitcoin](https://unit42.paloaltonetworks.com/tag/bitcoin/ "Bitcoin") * [DLL hijacking](https://unit42.paloaltonetworks.com/tag/dll-hijacking/ "DLL hijacking") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/ "The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution") ![Pictorial representation of identity abuse through trusted communication channels. Close-up view of a digital screen displaying a glitched and pixelated image of a skull-like shape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/02_Malware_Category_1920x900-2-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 20, 2026 [#### Identity Abuse Through Trusted Communication Channels](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/) * [Authentication](https://unit42.paloaltonetworks.com/tag/authentication/ "authentication") * [Identity theft](https://unit42.paloaltonetworks.com/tag/identity-theft/ "identity theft") * [Malware](https://unit42.paloaltonetworks.com/tag/malware/ "malware") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/ "Identity Abuse Through Trusted Communication Channels") ![Pictorial representation of Kimwolf botnet malware family. Digital screen with a warning sign reading "Malware." The background features lines of computer code and graphics, creating a sense of cybersecurity threat.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/07_Malware_Category_1920x900-3-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 11, 2026 [#### Kimwolf v7: An Evolution of the Kimwolf Botnet](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/) * [Android APK](https://unit42.paloaltonetworks.com/tag/android-apk/ "Android APK") * [Ethereum](https://unit42.paloaltonetworks.com/tag/ethereum/ "Ethereum") * [HTTP](https://unit42.paloaltonetworks.com/tag/http/ "HTTP") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/kimwolf-v7-botnet-malware/ "Kimwolf v7: An Evolution of the Kimwolf Botnet") ![Pictorial representatiom pf Aeternum's blockchain C2. A close-up of a computer circuit board with a central microchip is depicted. Red digital data streams in the form of glowing binary numbers and arrows appear to flow in and out of the chip. The scene is illuminated with a futuristic blue and red glow.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/04_Malware_Category_1920x900-4-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 10, 2026 [#### The Permanent Threat: Analyzing Aeternum's Blockchain-Based C2 Operations and Communications](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/) * [Aeternum](https://unit42.paloaltonetworks.com/tag/aeternum/ "Aeternum") * [Infection chain](https://unit42.paloaltonetworks.com/tag/infection-chain/ "infection chain") * [JSON](https://unit42.paloaltonetworks.com/tag/json/ "JSON") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/ "The Permanent Threat: Analyzing Aeternum’s Blockchain-Based C2 Operations and Communications") ![Pictorial representation of ChainDrop, a self-propagating npm worm. An artistic depiction of a digital workspace featuring an open laptop with a red virus on the screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/03_Malware_Category_1920x900-7-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) August 6, 2026 [#### ChainDrop: Inside a Self-Propagating npm Worm](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/) * [Blockchain](https://unit42.paloaltonetworks.com/tag/blockchain/ "blockchain") * [ChainDrop](https://unit42.paloaltonetworks.com/tag/chaindrop/ "ChainDrop") * [Claude code](https://unit42.paloaltonetworks.com/tag/claude-code/ "Claude code") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/ "ChainDrop: Inside a Self-Propagating npm Worm") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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