{"id":1055,"date":"2026-06-19T14:37:23","date_gmt":"2026-06-19T09:07:23","guid":{"rendered":"https:\/\/www.hexnode.com\/threat-watch\/?p=1055"},"modified":"2026-08-21T13:18:20","modified_gmt":"2026-08-21T07:48:20","slug":"gentlemen-ransomware-byovd-edr-killers","status":"publish","type":"post","link":"https:\/\/www.hexnode.com\/threat-watch\/gentlemen-ransomware-byovd-edr-killers\/","title":{"rendered":"Gentlemen Ransomware Uses BYOVD EDR Killers to Disable Endpoint Defenses"},"content":{"rendered":"<h2>Introduction<\/h2>\n<p>Ransomware operators increasingly recognize that defeating security tools can be just as important as deploying ransomware itself. Recent analysis of the Gentlemen ransomware operation reveals continued investment in specialized tools designed to disable endpoint detection and response (EDR) solutions before the main attack phase begins.<\/p>\n<p>Rather than relying solely on ransomware payloads, the group appears to be building a broader ecosystem focused on defense evasion, credential access, and operational resilience.<\/p>\n<p>The latest findings provide insight into how modern ransomware affiliates may attempt to reduce visibility across targeted environments, potentially creating opportunities for follow-on malicious activity with fewer security alerts.<\/p>\n<p><center>    \t\t<!-- button style scb20be917a3efc78059cf9961ee4e54284 -->\r\n    \t\t<style>\r\n    \t\t\t.scb20be917a3efc78059cf9961ee4e54284, a.scb20be917a3efc78059cf9961ee4e54284{\r\n    \t\t\t\tcolor: #fff;\r\n    \t\t\t\tbackground-color: #00868B;\r\n    \t\t\t}\r\n    \t\t\t.scb20be917a3efc78059cf9961ee4e54284:hover, a.scb20be917a3efc78059cf9961ee4e54284:hover{\r\n    \t\t\t\t    \t\t\t\tbackground-color: #32b8bd;\r\n    \t\t\t}\r\n    \t\t<\/style>\r\n    \t\t<a href=\"https:\/\/www.hexnode.com\/xdr\/\" class=\"ht-shortcodes-button scb20be917a3efc78059cf9961ee4e54284  hn-cta__blogs--inline-button \" id=\"\" style=\"\" target=\"_blank\">\r\n    \t\tStrengthen Your Endpoint Defenses with Hexnode XDR<\/a>\r\n    \t\t<\/center><\/p>\n<h2>The Rise of EDR Killers in the Gentlemen Toolkit<\/h2>\n<p>Gentlemen has expanded GentleKiller, its <a href=\"https:\/\/www.hexnode.com\/blogs\/explained\/what-is-endpoint-detection-and-response-edr\/\">EDR<\/a>-killing framework, into multiple variants.<\/p>\n<p>The variants reportedly impersonate legitimate software or security products, including Kaspersky, Valorant, Javelin, and WatchDog. This approach can make malicious components appear less suspicious during cursory inspection while helping operators blend into legitimate software environments.<\/p>\n<p>Public reporting indicates that GentleKiller targets more than 400 processes linked to approximately 48 security vendors and products. The targeted ecosystem reportedly includes endpoint protection and EDR technologies from several major cybersecurity providers.<\/p>\n<p>The operation&#8217;s tooling extends beyond GentleKiller itself. Investigators also documented the use of additional EDR-killing utilities, including HexKiller, ThrottleBlood, and HavocKiller.<\/p>\n<p>Maintaining multiple tools for a similar purpose suggests a deliberate effort to preserve operational flexibility if one tool becomes ineffective due to vendor mitigations, software updates, or improved detections.<\/p>\n<p><a href=\"https:\/\/www.welivesecurity.com\/en\/eset-research\/edr-killers-explained-beyond-the-drivers\/?utm_source=hexnode_blog&amp;utm_medium=referral&amp;utm_campaign=gentlemen_ransomware\" target=\"_blank\" rel=\"nofollow noreferrer noopener\">This layered approach reflects an increasingly common strategy among ransomware operators: ensuring that security controls can be disrupted before more visible attack activities begin.<\/a><\/p>\n<h2>How BYOVD Enables Security Tool Tampering<\/h2>\n<p>A key element of the campaign is the use of bring-your-own-vulnerable-driver (BYOVD) attacks.<\/p>\n<p>In a BYOVD attack, adversaries load a legitimately signed but vulnerable driver onto a system and exploit its weaknesses to gain elevated privileges. Because these drivers are legitimately signed but vulnerable, attackers may abuse them to obtain kernel-level capabilities when operating system and security controls allow the driver to load.<\/p>\n<p>According to public analysis, GentleKiller leverages this technique to interfere with security processes and defensive software. Kernel-level privileges can provide attackers with greater control over endpoint operations and may enable actions that are difficult to perform from user space alone.<\/p>\n<p>The framework reportedly appears adaptable, allowing operators to use different vulnerable or malicious drivers across variants. This flexibility can help attackers adapt as vendors patch known weaknesses or introduce protections against specific drivers.<\/p>\n<p>Additional tactics observed within the toolkit include obfuscation, packing techniques, and software impersonation. Together, these methods are intended to increase the likelihood that malicious activity remains undetected long enough for subsequent attack stages to proceed.<br \/>\n<div class=\"next_blog\"><div class=\"post-next\"><div class=\"hex_blog_box_parent\"><div class=\"blog_warp_next\"><div class=\"next_blog_thumb\" style=\"background-image:url(https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Real-Time-Threat-Detection-Hexnode-UEM-XDR-150x150-1.webp?format=webp)\"><\/div><div class=\"next_post_content\"><div class=\"center_box\"><h4>Vulnerability Assessment with Hexnode UEM + XDR<\/h4><p>Learn how UEM and XDR work together to provide real-time threat visibility across managed devices.<\/p><\/div><\/div><\/div><a class=\"hex_blog_box_link hn-cta__blogs--blog-box\" href=\"https:\/\/www.hexnode.com\/blogs\/real-time-threat-detection\/\" aria-label=\"Vulnerability Assessment with Hexnode UEM + XDR\"><\/a><\/div><\/div><\/div><\/p>\n<h2>Why Ransomware Groups Are Investing in EDR Killers<\/h2>\n<p>The growing use of EDR killers reflects a shift in how <a href=\"https:\/\/www.hexnode.com\/blogs\/explained\/what-is-ransomware-in-cybersecurity\/\">ransomware<\/a> operations approach intrusion campaigns.<\/p>\n<p>Many modern ransomware groups invest in specialized tooling that supports different stages of an intrusion, including access, privilege escalation, credential acquisition, defense evasion, and ransomware deployment.<\/p>\n<p>Disabling security controls can provide several operational advantages.<\/p>\n<p>Reduced endpoint visibility may make it more difficult for defenders to identify suspicious behavior during the early stages of an intrusion. This can potentially give attackers additional time to conduct reconnaissance, search for privileged accounts, move between systems, or prepare ransomware deployment.<\/p>\n<p>The presence of OxideHarvest, a Rust-based credential-stealing utility associated with the group&#8217;s activity, further illustrates this broader operational focus. While publicly available reporting links the tool to the operation, details regarding its role in individual incidents remain limited.<\/p>\n<p>Taken together, the toolset suggests that the group is investing in multiple stages of the attack lifecycle rather than relying on a single ransomware payload.<\/p>\n<h2>What Is Confirmed and What Remains Unclear<\/h2>\n<p>Confirmed reporting indicates that:<\/p>\n<ul>\n<li>GentleKiller ransomware exists in multiple variants.<\/li>\n<li>The framework abuses vulnerable drivers to obtain elevated privileges.<\/li>\n<li>The toolkit targets a large number of security-related processes.<\/li>\n<li>Additional EDR-killing tools have been observed alongside GentleKiller.<\/li>\n<li>OxideHarvest has been associated with the group&#8217;s activity.<\/li>\n<\/ul>\n<p>At the same time, important details remain unclear.<\/p>\n<p>Public reporting has not confirmed:<\/p>\n<ul>\n<li>Which organizations were targeted using the newly documented tools.<\/li>\n<li>Whether credential theft was successful in specific incidents.<\/li>\n<li>Whether data was exfiltrated during campaigns involving these tools.<\/li>\n<li>How frequently each EDR killer is deployed during ransomware operations.<\/li>\n<li>Whether all affiliates use the same tooling throughout the attack lifecycle.<\/li>\n<\/ul>\n<p>As is often the case with <a href=\"https:\/\/www.hexnode.com\/blogs\/explained\/what-is-ransomware-as-a-service-raas\/\">ransomware-as-a-service<\/a> ecosystems, operational methods may differ between affiliates and individual campaigns.<\/p>\n<h2>Why Driver Governance Has Become a Security Priority<\/h2>\n<p>The widespread use of BYOVD techniques highlights a challenge that extends beyond a single ransomware operation.<\/p>\n<p>Vulnerable drivers represent a unique security risk because they can transform trusted software components into attack tools. Rather than exploiting a vulnerability in the target environment itself, attackers may abuse weaknesses within already trusted drivers to gain elevated access.<\/p>\n<p>This trend reinforces the importance of driver governance as part of endpoint security programs.<\/p>\n<p>Organizations should consider measures such as:<\/p>\n<ul>\n<li>Maintaining strong patch management practices<\/li>\n<li>Reducing unnecessary software installations<\/li>\n<li>Enforcing application control policies<\/li>\n<li>Monitoring for unexpected driver loading activity<\/li>\n<li>Reviewing endpoint hardening standards<\/li>\n<li>Using vulnerable-driver blocklists where supported<\/li>\n<\/ul>\n<p>Attackers increasingly leverage driver abuse to achieve broader attack objectives, making it a critical focus area for security teams.<br \/>\n<section id='resource-single'>\n                    <div class='resource-box'>\n                        <div class='resource-box__image-section'>\n                            <div class='resource-box__image-wrap'>\n                                <img decoding=\"async\" src=\"https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Hexnode_UEM-Capability-statement-e1783572504474.png?format=webp\" class=\"resource-box__image\" alt=\"Hexnode_UEM-Capability-statement\" loading=\"lazy\" srcset=\"https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Hexnode_UEM-Capability-statement-e1783572504474.png?format=webp 698w, https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Hexnode_UEM-Capability-statement-e1783572504474-300x284.png?format=webp 300w, https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Hexnode_UEM-Capability-statement-e1783572504474-106x100.png?format=webp 106w\" sizes=\"auto, (max-width: 698px) 100vw, 698px\" title=\"Hexnode_UEM-Capability-statement\" \/>\n                            <\/div>\n                        <\/div>\n                        <div class='resource-box__content-section'>\n                            <h5 class='resource-box__content-subheading'>\n                            Featured resource\n                            <\/h5>\n                            <h4 class='resource-box__content-heading'>\n                            Hexnode UEM Capability Statement\n                            <\/h4>\n                            <p class='resource-box__contents'>\n                            Explore how Hexnode UEM helps organizations manage, secure, and automate endpoint operations across diverse devices.\n                            <\/p>\n                            <a class='resource-box__content-link hn-cta__blogs--resource-box' href='https:\/\/www.hexnode.com\/resources\/brochures\/hexnode-uem-capability-statement\/'>\n                            Download the brochure\n                            <svg xmlns='http:\/\/www.w3.org\/2000\/svg' width='20' height='20' viewBox='0 0 20 20'>\n                            <g id='arrow' transform='translate(-309 -191)' opacity='0'>\n                                <rect id='base' width='20' height='20' transform='translate(309 191)' fill='none'\/>\n                                <path id='arrow-2' data-name='arrow' d='M13.093.5,6.8,6.8.5.5' transform='translate(315 207.594) rotate(-90)' fill='none' stroke='#0549d1' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.2'\/>\n                            <\/g>\n                            <\/svg>\n\n                            <\/a>\n                        <\/div>\n                    <\/div>\n                <\/section><\/p>\n<h2>How Hexnode Can Help Strengthen Endpoint Resilience<\/h2>\n<p>Defending against defense-evasion techniques requires a combination of endpoint hardening, visibility, and rapid response capabilities.<\/p>\n<h3>Hexnode UEM<\/h3>\n<p><a href=\"https:\/\/www.hexnode.com\/uem\/\">Hexnode UEM<\/a> can help organizations strengthen endpoint posture through:<\/p>\n<ul>\n<li>Device policy enforcement<\/li>\n<li>Application management<\/li>\n<li>Patch management<\/li>\n<li>Device compliance monitoring<\/li>\n<li>Security configuration management<\/li>\n<\/ul>\n<p>These capabilities can help organizations manage patches, enforce application policies, and maintain device compliance across managed endpoints.<\/p>\n<h3>Hexnode XDR<\/h3>\n<p>Hexnode XDR provides endpoint-focused detection, investigation, and response capabilities that support security teams when they identify suspicious activity.<\/p>\n<p>Security teams can use Hexnode XDR to:<\/p>\n<ul>\n<li>Investigate threats using endpoint data and query-based threat hunting<\/li>\n<li>Review audit trails, endpoint data, and threat context during investigations<\/li>\n<li>Isolate compromised devices<\/li>\n<li>Terminate malicious processes<\/li>\n<li>Quarantine identified malicious files<\/li>\n<\/ul>\n<p>These capabilities empower security teams during incident response whenever they suspect endpoint tampering or ransomware activity.<\/p>\n<h3>Hexnode IdP<\/h3>\n<p>Strong identity controls remain an important layer of defense against credential-focused attacks.<\/p>\n<p><a href=\"https:\/\/www.hexnode.com\/idp\/\">Hexnode IdP<\/a> can help organizations implement:<\/p>\n<ul>\n<li>Multi-factor authentication (MFA)<\/li>\n<li>Role-based access control (RBAC)<\/li>\n<li>Device compliance checks<\/li>\n<li>Microsoft Entra ID integration<\/li>\n<li>Basic conditional access policies<\/li>\n<\/ul>\n<p>These controls can help strengthen access governance and support policies that limit unauthorized access from unmanaged or non-compliant devices.<\/p>\n<h2>Conclusion<\/h2>\n<p>The latest findings surrounding the Gentlemen ransomware operation demonstrate how ransomware groups continue to expand beyond traditional encryption-focused tooling.<\/p>\n<p>By combining GentleKiller, additional EDR-killing utilities, and credential-focused tooling, the operation appears to be investing heavily in defense evasion and attack preparation. BYOVD attacks demonstrate how attackers can weaponize trusted components to undermine endpoint protections.<\/p>\n<p>For security teams, the lesson is clear: ransomware defense is no longer just about detecting encryptors. Monitoring for security tool tampering, suspicious driver activity, credential-access behavior, and other early-stage indicators can provide critical opportunities to investigate and contain threats before ransomware deployment occurs.<br \/>\n<div class=\"signup_box\"><div class=\"signup_wrap_img\"><div class=\"signup-bg\" style=\"background-image:url(https:\/\/www.hexnode.com\/threat-watch\/wp-content\/uploads\/2026\/08\/Hexnode-MDM-free-trial.jpg?format=webp)\"><\/div><\/div><div class=\"signup_wrap\"><h5>Strengthen Your Security Posture<\/h5><p>Get insights on ransomware trends, threat detection, incident response, and modern endpoint defense strategies.<\/p><a href=\"https:\/\/www.hexnode.com\/mobile-device-management\/cloud\/signup\/\" class=\"hn-cta__blogs--signup-stripe\" target=\"_blank\"> Try Hexnode Now<\/a><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Ransomware operators increasingly recognize that defeating security tools can be just as important as&#8230;<\/p>\n","protected":false},"author":4,"featured_media":1056,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11,13],"class_list":["post-1055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ransomware","category-identity-abuse","product_category-extended-detection-and-response","main_category-featured","tab_group-malware-and-ransomware"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gentlemen Ransomware Uses BYOVD EDR Killers<\/title>\n<meta name=\"description\" content=\"Gentlemen ransomware uses BYOVD-based EDR killer tools and credential-stealing utilities as part of its broader pre-ransomware toolkit.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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