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A New Breed of Ransomware Threat Emerges
The ransomware landscape has evolved dramatically over the past few years, but few groups have attracted as much attention as The Gentlemen. While many cybercriminal organizations compete through aggressive extortion tactics, sophisticated encryption mechanisms, or large-scale victim targeting, The Gentlemen has taken a different path. Their success is rooted not only in ransomware deployment but in the industrialization of attack preparation itself.
A detailed investigation published by ESET on June 18, 2026, revealed the inner workings of one of the world’s fastest-growing ransomware operations. Backed by months of forensic research and validated through a leaked internal dataset from May 2026, the report paints a troubling picture of a criminal enterprise focused on removing one of the biggest obstacles facing ransomware affiliates: endpoint security software.
Since its emergence in late 2025, The Gentlemen has reportedly claimed responsibility for more than 500 victims worldwide, rapidly climbing into the ranks of the most active ransomware organizations during the first quarter of 2026. What investigators discovered goes beyond ordinary ransomware activity. The group has effectively transformed the process of disabling security protections into a centralized service, making sophisticated cyberattacks easier than ever for less experienced criminals.
ESET Uncovers a Unique Criminal Business Model
Most ransomware-as-a-service operations function similarly. Core developers create the ransomware, while affiliates are responsible for gaining access to networks, bypassing security products, and deploying payloads.
The Gentlemen disrupted this traditional model.
Instead of forcing affiliates to find their own methods for disabling Endpoint Detection and Response (EDR) solutions, the operators provide ready-made tools specifically designed to neutralize security products before encryption begins. This dramatically lowers the technical expertise required to conduct successful attacks.
The strategy effectively turns ransomware deployment into a plug-and-play criminal service. Affiliates no longer need advanced malware development skills or extensive research into security bypass techniques. They receive professionally maintained tools directly from the operators, increasing operational efficiency while reducing failure rates.
For cybercriminals seeking profit without extensive technical knowledge, this approach represents a significant advantage.
The Leaked Data Confirmed Long-Held Suspicions
Cybersecurity researchers had suspected for months that The Gentlemen maintained an internal ecosystem for distributing EDR-disabling tools.
Those suspicions became reality when leaked internal communications surfaced in May 2026.
The leak revealed discussions involving the
This revelation exposed a level of operational maturity typically associated with legitimate software companies rather than criminal enterprises.
The
GentleKiller: The Weapon at the Heart of the Operation
At the center of The
Researchers identified at least eight separate variants of the tool, each disguised as a legitimate software product while leveraging different vulnerable kernel drivers. The framework relies heavily on a technique known as Bring Your Own Vulnerable Driver (BYOVD), which allows attackers to abuse trusted drivers in order to gain privileged access to system resources.
Rather than building entirely separate tools, developers appear to rely on a shared template architecture.
Analysis revealed consistent code structures, behavioral similarities, and common development patterns across all observed versions. The only significant changes involve the impersonated software products and the vulnerable drivers utilized.
This modular approach enables rapid adaptation while minimizing development costs.
In practical terms, attackers can quickly release new variants whenever existing drivers become blocked or detected by security vendors.
Targeting the Security Industry Itself
One of the most alarming discoveries involves the scale of security software targeted by GentleKiller.
Researchers found that the framework actively hunts for more than 400 processes associated with 48 separate cybersecurity products.
Among the targeted platforms are some of the industry’s most widely deployed solutions, including CrowdStrike, SentinelOne, Microsoft Defender, Sophos, Carbon Black, ESET, and numerous others.
The list demonstrates extensive research into enterprise security environments.
Rather than focusing on a small number of products, The Gentlemen developed a comprehensive catalog of security solutions likely to be encountered during ransomware operations. This significantly increases the probability of successful execution regardless of the victim’s defensive stack.
The result is a versatile attack platform capable of functioning across a broad range of enterprise environments.
Speed Has Become a Competitive Advantage
One characteristic repeatedly highlighted by researchers is The Gentlemen’s remarkable speed of adaptation.
Cybercriminal groups often require weeks or months to incorporate newly discovered vulnerabilities into operational toolsets.
The Gentlemen appears to operate on a different timeline.
Proof-of-concept EDR killer tools such as UnknownKiller and PoisonKiller were reportedly integrated into active operations within days of public disclosure. This rapid weaponization cycle demonstrates a highly organized development process capable of monitoring security research, evaluating new techniques, and integrating them into production environments almost immediately.
Such agility creates serious challenges for defenders.
Organizations may have little time to react between public disclosure of a vulnerability and its active exploitation by ransomware affiliates.
Expanding Beyond In-House Development
The
Researchers identified several externally sourced EDR-killing tools incorporated into the group’s arsenal.
Among them is HexKiller, previously linked to the Warlock ransomware operation. Another tool, ThrottleBlood, has appeared in attacks connected to MedusaLocker and DragonForce affiliates. HavocKiller, publicly disclosed by Huntress in March 2026, was also discovered in incidents tied to The Gentlemen months before its public exposure.
Rather than simply distributing these tools as-is, operators standardized them using identical obfuscation techniques.
Digital signatures were copied or fabricated. Icons were cloned from legitimate security products. Version information was falsified. Protective packers such as Enigma and Themida were employed to complicate reverse engineering.
The result is a highly consistent ecosystem designed to confuse analysts and evade detection.
A Different Approach to Victim Selection
Unlike many major ransomware gangs that heavily focus on organizations within the United States, The Gentlemen displays a far more diverse victim profile.
The
According to leaked operational data, geography is not the primary factor driving victim selection.
Instead, the group prioritizes vulnerable internet-facing infrastructure, particularly misconfigured FortiGate appliances.
Targets are centrally selected and distributed to affiliates rather than independently chosen by individual operators.
This approach resembles a corporate lead-generation model where opportunities are identified, vetted, and assigned through a structured workflow.
Such centralization improves efficiency while ensuring consistent targeting standards across the affiliate network.
OxideHarvest Reveals Additional Capabilities
The ESET investigation also uncovered a Rust-based credential theft utility known as OxideHarvest, sometimes referred to as buildx641.
Unlike GentleKiller, which appears to originate from core operators, OxideHarvest is believed to be maintained by an affiliate operating under the alias quant.
The malware targets a broad range of browsers including Chrome, Edge, Firefox, Brave, Opera, OperaGX, Vivaldi, Waterfox, and several others.
Its purpose is straightforward but highly dangerous.
Using supplied credentials, the malware logs into designated systems, extracts stored browser secrets, and exports the collected information for later use.
This capability highlights the broader ecosystem surrounding The Gentlemen, where affiliates contribute specialized tools that complement ransomware deployment and data theft operations.
The Founder Behind the Alias
Adding another layer of intrigue, investigative journalist Brian Krebs published evidence connecting The Gentlemen’s founder, known online as hastalamuerte, to a real-world identity.
The investigation linked the alias to Alexander Andreevich Yapaev, a 36-year-old Russian national from Izhevsk.
Evidence reportedly emerged through Telegram account associations, breach intelligence databases, and leaked Russian government records.
Researchers believe Yapaev previously participated in several high-profile ransomware operations, including Qilin, Embargo, LockBit, Medusa, and BlackLock before launching The Gentlemen.
If accurate, the findings suggest the
Why The Gentlemen Matters to the Cybersecurity Industry
The most significant lesson from the ESET report is not simply that another ransomware group exists.
The real story is the professionalization of attack enablement.
The Gentlemen has transformed a technically difficult phase of ransomware deployment into a managed service available to affiliates. By centralizing EDR bypass development and rapidly incorporating emerging exploitation techniques, the group has reduced barriers that once limited participation in ransomware campaigns.
This model could become a blueprint for future ransomware organizations.
If copied by competitors, the cybercrime ecosystem may experience a surge in attack volume as increasingly inexperienced operators gain access to sophisticated offensive capabilities.
The threat extends beyond individual ransomware incidents. It represents a structural evolution in how cybercriminal organizations operate, collaborate, and scale.
What Undercode Say:
The ESET findings reveal a deeper shift occurring inside the ransomware economy.
For years, successful ransomware operations depended heavily on highly skilled affiliates capable of bypassing enterprise security products.
The Gentlemen appears to be removing that requirement.
This mirrors trends seen in legitimate cloud computing services.
Complex technical functions are being centralized and offered as services.
Affiliates become consumers rather than developers.
The criminal ecosystem gains scalability.
Development costs are shared.
Operational consistency improves.
Success rates increase.
The use of BYOVD techniques demonstrates how attackers increasingly exploit trust relationships within operating systems.
Trusted drivers remain one of the most dangerous attack vectors.
Security vendors continue improving user-mode protections.
Attackers continue moving deeper into kernel space.
The speed of adaptation is perhaps the most concerning factor.
Days between disclosure and deployment create extremely small defensive windows.
Traditional patch cycles struggle to keep pace.
Threat intelligence becomes more valuable than ever.
Organizations relying solely on signature-based detection face growing challenges.
Behavioral monitoring becomes critical.
Driver monitoring becomes critical.
Kernel telemetry becomes critical.
The leaked process targeting list provides defenders with rare visibility.
Such intelligence allows proactive detection engineering.
Organizations can build monitoring rules before future variants appear.
The structured victim distribution model suggests strong internal management.
This is not opportunistic hacking.
This resembles organized cybercrime operations with business processes.
The integration of third-party tools demonstrates practical efficiency.
Attackers are not reinventing every capability.
They acquire, standardize, and operationalize existing technologies.
That strategy accelerates innovation.
The alleged identification of leadership further highlights the interconnected nature of ransomware ecosystems.
Many operators migrate between gangs.
Experience accumulates.
Techniques evolve.
Infrastructure improves.
The most important takeaway is that ransomware groups are increasingly behaving like software companies.
They maintain products.
They support users.
They release updates.
They distribute tools.
They gather feedback.
They optimize workflows.
Defenders must recognize that modern ransomware is no longer just malware.
It is an entire service ecosystem competing for market share inside the underground economy.
Deep Analysis
The following commands can help defenders investigate suspicious driver activity, endpoint security tampering, and potential BYOVD abuse within enterprise environments.
Linux
lsmod modinfo <driver_name> dmesg | grep -i driver journalctl -k find /lib/modules -type f sha256sum suspicious_driver.sys lsof | grep deleted ps auxf netstat -tulpn ss -antp auditctl -l Windows
driverquery /v sc query type= driver fltmc tasklist /svc
Get-WinEvent -LogName System
Get-CimInstance Win32_SystemDriver Get-Process Get-Service netstat -ano macOS
kmutil showloaded systemextensionsctl list log show --last 24h ps aux lsof -i netstat -an launchctl list spctl --assess
Detection Engineering Focus Areas
Monitor vulnerable driver loads
Track unexpected process termination events
Inspect kernel driver installations
Alert on security product shutdown attempts
Correlate EDR failures with driver activity
Hunt for renamed security-related executables
Track unsigned driver execution
Review privilege escalation chains
✅ ESET publicly documented The
✅ Researchers observed extensive use of BYOVD techniques and confirmed targeting of numerous enterprise security products through process-killing mechanisms.
✅ Available reporting supports claims that The Gentlemen rapidly integrates newly disclosed proof-of-concept offensive tools, demonstrating an unusually fast weaponization cycle compared to many traditional ransomware operations.
Prediction
(+1) The ransomware industry will increasingly adopt centralized offensive tooling, allowing less experienced affiliates to conduct attacks that previously required advanced technical expertise.
(+1) Security vendors will accelerate development of kernel-level monitoring, vulnerable driver blocklists, and behavioral analytics specifically designed to counter BYOVD-based attacks.
(+1) Threat intelligence sharing between vendors and enterprises will become more important as ransomware groups shorten the gap between vulnerability disclosure and real-world exploitation.
(-1) More ransomware operators are likely to copy The Gentlemen’s affiliate support model, potentially increasing the number of successful attacks against underprepared organizations.
(-1) BYOVD exploitation will remain a major challenge because trusted drivers continue to provide powerful pathways around traditional security controls.
(-1) Organizations that rely exclusively on endpoint signatures and periodic patching may face rising compromise rates as attackers continue weaponizing new proof-of-concept tools within days of public release.
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References:
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