{"id":52271,"date":"2023-06-09T00:00:00","date_gmt":"2023-06-09T00:00:00","guid":{"rendered":"urn:uuid:39131db4-b36e-6b35-7c9d-d3714f8ec617"},"modified":"2023-06-09T00:00:00","modified_gmt":"2023-06-09T00:00:00","slug":"analyzing-the-fud-malware-obfuscation-engine-batcloak","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/analyzing-the-fud-malware-obfuscation-engine-batcloak\/","title":{"rendered":"Analyzing the FUD Malware Obfuscation Engine BatCloak"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/thumbnails\/23\/analyzing-fud-malware-obfuscation-engine-batcloak.jpg\"><!-- OneTrust Cookies Consent Notice start for trendmicro.com --><!-- OneTrust Cookies Consent Notice end for trendmicro.com --> <head> <meta charset=\"UTF-8\"> <meta name=\"viewport\" content=\"width=device-width\"> <meta name=\"description\" content=\"We look into BatCloak engine, its modular integration into modern malware, proliferation mechanisms, and interoperability implications as malicious actors take advantage of its fully undetectable (FUD) capabilities.\"> <meta name=\"robots\" content=\"index,follow\"> <meta name=\"keywords\" content=\"malware,cyber crime,exploits &amp; vulnerabilities,phishing,privacy &amp; risks,cyber threats,endpoints,articles, news, reports\"> <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge,chrome=1\"> <meta name=\"template\" content=\"article1withouthero\"> <meta property=\"article:published_time\" content=\"2023-06-09\"> <meta property=\"article:tag\" content=\"malware\"> <meta property=\"article:section\"> <link rel=\"icon\" type=\"image\/ico\" href=\"\/content\/dam\/trendmicro\/favicon.ico\"> <link rel=\"canonical\" href=\"https:\/\/www.trendmicro.com\/en_us\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak.html\"> <title>Analyzing the FUD Malware Obfuscation Engine BatCloak<\/title> <link href=\"https:\/\/fonts.googleapis.com\/css?family=Open+Sans:300,300i,400,400i,600\" rel=\"stylesheet\">\n<link href=\"\/\/customer.cludo.com\/css\/296\/1798\/cludo-search.min.css\" type=\"text\/css\" rel=\"stylesheet\"> <link rel=\"stylesheet\" href=\"\/etc.clientlibs\/trendresearch\/clientlibs\/clientlib-trendresearch.min.css\" type=\"text\/css\">\n<link rel=\"stylesheet\" href=\"\/etc.clientlibs\/trendmicro\/clientlibs\/trendmicro-core-2\/clientlibs\/header-footer.min.css\" type=\"text\/css\"> <meta property=\"og:url\" content=\"https:\/\/www.trendmicro.com\/en_us\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak.html\"><br \/>\n<meta property=\"og:title\" content=\"Analyzing the FUD Malware Obfuscation Engine BatCloak\"><br \/>\n<meta property=\"og:description\" content=\"We look into BatCloak engine, its modular integration into modern malware, proliferation mechanisms, and interoperability implications as malicious actors take advantage of its fully undetectable (FUD) capabilities.\"><br \/>\n<meta property=\"og:site_name\" content=\"Trend Micro\"><br \/>\n<meta property=\"og:image\" content=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/thumbnails\/23\/analyzing-fud-malware-obfuscation-engine-batcloak.jpg\"><br \/>\n<meta property=\"og:locale\" content=\"en_US\"> <meta name=\"twitter:card\" content=\"summary_large_image\"><br \/>\n<meta name=\"twitter:site\" content=\"@TrendMicro\"><br \/>\n<meta name=\"twitter:title\" content=\"Analyzing the FUD Malware Obfuscation Engine BatCloak\"><br \/>\n<meta name=\"twitter:description\" content=\"We look into BatCloak engine, its modular integration into modern malware, proliferation mechanisms, and interoperability implications as malicious actors take advantage of its fully undetectable (FUD) capabilities.\"><br \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/thumbnails\/23\/analyzing-fud-malware-obfuscation-engine-batcloak.jpg\"> <\/head> <body class=\"articlepage page basicpage context-business\" id=\"readabilityBody\" readability=\"47.702479338843\"> <!-- Page Scroll: Back to Top --> <a id=\"page-scroll\" title=\"VerticalPageScroll\" href=\"javascript:jumpScroll($(this).scrollTop());\"> <span class=\"icon-chevron-up\"><\/span> <\/a> <!-- \/* Data Layer *\/ --> <\/p>\n<div class=\"root responsivegrid\">\n<div class=\"aem-Grid aem-Grid--12 aem-Grid--default--12 \">\n<div class=\"articleBodyNoHero aem-GridColumn aem-GridColumn--default--12\">\n<div class=\"research-layout article container\" role=\"contentinfo\">\n<article class=\"research-layout--wrapper row\" data-article-pageid=\"1866887387\">\n<div class=\"col-xs-12 col-md-12 one-column\">\n<div class=\"col-xs-12 col-md-12\" readability=\"10.245967741935\">\n<div class=\"article-details\" role=\"heading\" readability=\"40.008064516129\"> <span class=\"article-details__bar\" role=\"img\"><\/span> <\/p>\n<p class=\"article-details__display-tag\">Malware<\/p>\n<p class=\"article-details__description\">We look into BatCloak engine, its modular integration into modern malware, proliferation mechanisms, and interoperability implications as malicious actors take advantage of its fully undetectable (FUD) capabilities.<\/p>\n<p class=\"article-details__author-by\">By: Peter Girnus, Aliakbar Zahravi <time class=\"article-details__date\">June 09, 2023<\/time> <span>Read time:&nbsp;<\/span><span class=\"eta\"><\/span> (<span class=\"words\"><\/span> words) <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<hr class=\"research-layout-divider\"> <main class=\"main--content col-xs-12 col-lg-8 col-lg-push-2\"> <\/p>\n<div class=\"richText\" readability=\"43.115612198452\">\n<div readability=\"33.534365043241\">\n<p>In our recent investigation, we discovered the use of heavily obfuscated batch files utilizing the advanced BatCloak engine to deploy various malware families at different instances. Running analysis and sample collection from September 2022 to June 2023, we found that these batch files are designed to be fully undetectable (FUD) and have demonstrated a remarkable ability to persistently evade security solutions. As a result, threat actors can load various malware families and exploits by leveraging highly obfuscated batch files seamlessly. Our initial research titled \u201c<a href=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak\/tb-the-dark-evolution-advanced-malicious-actors-unveil-malware-modification-progression.pdf\">The Dark Evolution: Advanced Malicious Actors Unveil Malware Modification Progression<\/a>\u201d delves into the continuing evolution of BatCloak, uncovering the modifications that have propelled modern malware to new levels of security evasion.<\/p>\n<p>This is the first entry in a three-part technical research series taking an in-depth look at the continuing evolution of the highly evasive batch obfuscation engine BatCloak. The second part of this series will look into the remote access trojan (RAT) SeroXen, a piece of malware gaining popularity for its stealth and, in its latest iterations, <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/stealthy-seroxen-rat-malware-increasingly-used-to-target-gamers\/\">targets<\/a> gamers, enthusiast communities, and organizations. Aside from the RAT\u2019s own tools, we will look into the updated BatCloak engine included as SeroXen\u2019s loading mechanism. The third and last part of this series will detail the distribution mechanisms of SeroXen and BatCloak. We also include our security insights on the community and demographic impact of this level of sophistication when it comes to batch FUD obfuscation.<\/p>\n<p><span class=\"body-subhead-title\">Defying detection: A preview of BatCloak engine\u2019s efficacy<\/span><\/p>\n<p>We analyzed hundreds of batch samples sourced from a public repository. The results showed a staggering 80% of the retrieved samples exhibiting zero detections from security solutions. This finding underscores the ability of BatCloak to evade traditional detection mechanisms employed by security providers. Moreover, when considering the overall sample set of 784, the average detection rate was less than one, emphasizing the challenging nature of identifying and mitigating threats associated with BatCloak-protected pieces of malware.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"image\">\n<figure class=\"image-figure\"> <img decoding=\"async\" src=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak\/figure1-analyzing-the-fud-malware-obfuscation-engine-batcloak.png\" alt=\"fig1-analyzing-the-fud-malware-obfuscation-engine-batcloak\"><figcaption>Figure 1. BatCloak detection counts from a public repository; samples and detection results collected from September 2022 to June 2023<\/figcaption><\/figure>\n<\/p><\/div>\n<div>\n<div class=\"richText\" readability=\"29.388663967611\">\n<div readability=\"11.236842105263\">\n<p>Understanding the evolving landscape of advanced malware techniques such as FUD obfuscator BatCloak enables us to develop more effective strategies for combating the ever-evolving threats posed by these sophisticated adversaries. These findings highlight the pressing need for enhanced approaches to malware detection and prevention, such as a cutting-edge&nbsp;<a href=\"https:\/\/www.trendmicro.com\/en_us\/business\/products\/user-protection\/sps\/endpoint.html\">multilayered defensive strategy<\/a>&nbsp;and&nbsp;<a href=\"https:\/\/www.trendmicro.com\/en_us\/business\/products\/detection-response\/xdr.html\">comprehensive security solutions<\/a>.<\/p>\n<p>Download the first part of our analysis on BatCloak engine <a href=\"https:\/\/www.trendmicro.com\/content\/dam\/trendmicro\/global\/en\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak\/tb-the-dark-evolution-advanced-malicious-actors-unveil-malware-modification-progression.pdf\">here<\/a>.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<section class=\"tag--list\">\n<p>Tags<\/p>\n<\/section>\n<p> <\/main> <\/article>\n<\/div>\n<\/div><\/div>\n<\/div>\n<p> <!-- \/* Core functionality javascripts, absolute URL to leverage Akamai CDN *\/ --> <!--For Modal-start--> <\/p>\n<p> <span>sXpIBdPeKzI9PC2p0SWMpUSM2NSxWzPyXTMLlbXmYa0R20xk<\/span> <\/p>\n<p> <!--For Modal-end--> <!-- Go to www.addthis.com\/dashboard to customize your tools --> <\/body> Read More <a href=\"https:\/\/www.trendmicro.com\/en_us\/research\/23\/f\/analyzing-the-fud-malware-obfuscation-engine-batcloak.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We look into BatCloak engine, its modular integration into modern malware, proliferation mechanisms, and interoperability implications as malicious actors take advantage of its fully undetectable (FUD) capabilities. Read More HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":52272,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[61],"tags":[9510,9521,9511,9508,9555,9513,9577,9536],"class_list":["post-52271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trendmicro","tag-trend-micro-research-articles-news-reports","tag-trend-micro-research-cyber-crime","tag-trend-micro-research-cyber-threats","tag-trend-micro-research-endpoints","tag-trend-micro-research-exploitsvulnerabilities","tag-trend-micro-research-malware","tag-trend-micro-research-phishing","tag-trend-micro-research-privacyrisks"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Analyzing the FUD Malware Obfuscation Engine BatCloak 2026 | ThreatsHub Cybersecurity 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