Out of Band Update: Cobalt Strike 4.9.1

<!DOCTYPE html> <html lang="en-US"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <link rel="profile" href="http://gmpg.org/xfn/11"> <meta name='robots' content='index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1' />  <title>Out of Band Update: Cobalt Strike 4.9.1 | Cobalt Strike</title> <meta name="description" content="Cobalt Strike 4.9.1 is live. This update contains fixes for issues in the 4.9 release for which there was no straightforward workaround." /> <link rel="canonical" href="https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491" /> <meta property="og:locale" content="en_US" /> <meta property="og:type" content="article" /> <meta property="og:title" content="Out of Band Update: Cobalt Strike 4.9.1 | Cobalt Strike" /> <meta property="og:description" content="Cobalt Strike 4.9.1 is live. This update contains fixes for issues in the 4.9 release for which there was no straightforward workaround." /> <meta property="og:url" content="https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491" /> <meta property="og:site_name" content="Cobalt Strike" /> <meta property="article:published_time" content="2023-10-10T13:29:25+00:00" /> <meta property="article:modified_time" content="2023-12-05T15:20:44+00:00" /> <meta property="og:image" content="https://www.cobaltstrike.com/app/uploads/2023/07/Screenshot-290.png" /> <meta property="og:image:width" content="610" /> <meta property="og:image:height" content="674" /> <meta property="og:image:type" content="image/png" /> <meta name="author" content="Greg Darwin" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:image" content="https://www.cobaltstrike.com/app/uploads/2023/07/Screenshot-290.png" /> <meta name="twitter:creator" content="@gregdarwin" /> <meta name="twitter:label1" content="Written by" /> <meta name="twitter:data1" content="Greg Darwin" /> <meta name="twitter:label2" content="Est. reading time" /> <meta name="twitter:data2" content="1 minute" /> <script type="application/ld+json" class="yoast-schema-graph">{"@context":"https://schema.org","@graph":[{"@type":"Article","@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/#article","isPartOf":{"@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/"},"author":{"name":"Greg Darwin","@id":"https://www.cobaltstrike.com/#/schema/person/be74ae01bec433d77ea65f6b757718ba"},"headline":"Out of Band Update: Cobalt Strike 4.9.1","datePublished":"2023-10-10T13:29:25+00:00","dateModified":"2023-12-05T15:20:44+00:00","mainEntityOfPage":{"@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/"},"wordCount":303,"publisher":{"@id":"https://www.cobaltstrike.com/#organization"},"image":{"@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/#primaryimage"},"thumbnailUrl":"https://www.cobaltstrike.com/app/uploads/2023/07/Screenshot-290.png","inLanguage":"en-US"},{"@type":"WebPage","@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/","url":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/","name":"Out of Band Update: Cobalt Strike 4.9.1 | Cobalt Strike","isPartOf":{"@id":"https://www.cobaltstrike.com/#website"},"primaryImageOfPage":{"@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/#primaryimage"},"image":{"@id":"https://www.cobaltstrike.com/blog/out-of-band-update-cobalt-strike-491/#primaryimage"},"thumbnailUrl":"https://www.cobaltstrike.com/app/uploads/2023/07/Screenshot-290.png","datePublished":"2023-10-10T13:29:25+00:00","dateModified":"2023-12-05T15:20:44+00:00","description":"Cobalt Strike 4.9.1 is live. 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</header> <div class="header-banner"> <div class="jumbotron jumbotron-fluid bg-4 " style="background-image: " > <div class="banner-wrapper"> <div class="container"> <p class="yoast-breadcrumbs m-0"><span><span><a href="https://www.cobaltstrike.com/">Home</a></span> » <span><a href="/blog/">Blog</a></span> » <span class="breadcrumb_last" aria-current="page">Out of Band Update: Cobalt Strike 4.9.1</span></span></p> <h1>Out of Band Update: Cobalt Strike 4.9.1</h1> <p class="font-italic">Tuesday 10 October, 2023</p> </div> </div> </div> </div> <div class="wrapper" id="page-wrapper"> <div class="container" id="content" tabindex="-1"> <div class="row"> <div class="col-lg-8 content-area" id="primary"> <main class="site-main" id="main"> <article class="post-5380 post type-post status-publish format-standard has-post-thumbnail hentry cornerstone-development cornerstone-releases cta_type-blog" id="post-5380"> <div class="entry-content"> <p>Cobalt Strike 4.9.1 is now available. This is an out of band update to fix an issue that was discovered in the <a href="https://www.cobaltstrike.com/blog/cobalt-strike-49-take-me-to-your-loader" target="_blank" rel="noreferrer noopener">4.9 release</a> that we felt would negatively impact customers as they start to roll out the release and for which there is no straightforward workaround. We also took the opportunity to address a couple of other issues that were slated to be addressed in the 4.10 release. This update does not affect the 4.10 release which is underway and due to ship in early 2024.  </p> <h3 class="wp-block-heading"><strong>Post-Ex Loader Obfuscate and Cleanup Settings</strong></h3> <p>We have fixed an issue whereby the default post-ex reflective loader was unable to apply the <strong>postex.obfuscate</strong> and <strong>postex.cleanup</strong> Malleable C2 options correctly. We also fixed a related issue that impacted UDRL developers due to the post-ex DLL’s CrtStartup routines. As a result of the above, we are also making a minor update to the UDRL-VS library available in the Arsenal kit. </p> <h3 class="wp-block-heading">Data Store</h3> <p>The data store was not able to identify .NET assemblies when the <strong>post-ex.obfuscate</strong> Malleable C2 profile option was set to “true.” This issue has now been fixed. We also took the opportunity to update the console help for the data store command. This now provides more information on how to run BOFs and .NET assemblies from the data store. </p> <p>We apologise for any problems that these issues may have caused and we hope that we have addressed these issues before the majority of our users have put the 4.9 release into play on active engagements. If you notice any other issues with Cobalt Strike, please refer to the <a href="https://www.cobaltstrike.com/support/" target="_blank" rel="noreferrer noopener">online support page</a>, or report them to our <a href="/cdn-cgi/l/email-protection#2b4844494a475f05485e585f445b586b4d44595f594a05484446" target="_blank" rel="noreferrer noopener">support email address</a>. Licensed users can download version 4.9.1 from <a href="https://download.cobaltstrike.com/download" target="_blank" rel="noreferrer noopener">the website</a>. To purchase Cobalt Strike or learn more, please <a href="https://www.cobaltstrike.com/quote-request/" target="_blank" rel="noreferrer noopener">contact us</a>. </p> </div> <footer class="entry-footer"> </footer> </article> </main> </div>  <div class="col-lg-4 align-self-start resource-sidebar widget-area"> <div class="sidebar-content bg-7 mb-3"> <div class=" container"> <div class="row"> <div class="col-12"> <div class="author-description p-3 row"> <div class="author-image col-5"> <img width="400" height="400" src="https://www.cobaltstrike.com/app/uploads/2023/07/Greg-profile.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="Greg Darwin bio picture" decoding="async" loading="lazy" srcset="https://www.cobaltstrike.com/app/uploads/2023/07/Greg-profile.jpg 400w, https://www.cobaltstrike.com/app/uploads/2023/07/Greg-profile-300x300.jpg 300w, https://www.cobaltstrike.com/app/uploads/2023/07/Greg-profile-150x150.jpg 150w" sizes="(max-width: 400px) 100vw, 400px" /> 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