{"id":47690,"date":"2022-07-27T17:16:02","date_gmt":"2022-07-27T17:16:02","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/33673\/Discovery-Of-New-UEFI-Rootkit-Exposes-An-Ugly-Truth-The-Attacks-Are-Invisible-To-Us.html"},"modified":"2022-07-27T17:16:02","modified_gmt":"2022-07-27T17:16:02","slug":"discovery-of-new-uefi-rootkit-exposes-an-ugly-truth-the-attacks-are-invisible-to-us","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/discovery-of-new-uefi-rootkit-exposes-an-ugly-truth-the-attacks-are-invisible-to-us\/","title":{"rendered":"Discovery Of New UEFI Rootkit Exposes An Ugly Truth: The Attacks Are Invisible To Us"},"content":{"rendered":"<figure class=\"intro-image intro-left\"> <img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/07\/chip-based-rootkit-800x534.jpeg\" alt=\"Discovery of new UEFI rootkit exposes an ugly truth: The attacks are invisible to us\"><figcaption class=\"caption\">\n<div class=\"caption-credit\">Getty Images<\/div>\n<\/figcaption><\/figure>\n<aside id=\"social-left\" class=\"social-left\" aria-label=\"Read the comments or share this article\"> <a title=\"134 posters participating, including story author\" class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/information-technology\/2022\/07\/researchers-unpack-unkillable-uefi-rootkit-that-survives-os-reinstalls\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">222<\/span> <span class=\"visually-hidden\"> with 134 posters participating, including story author<\/span> <\/a> <\/p>\n<div class=\"share-links\">\n<h4>Share this story<\/h4>\n<\/p><\/div>\n<\/aside>\n<p> <!-- cache hit 409:single\/related:d63ee3e6e993abd9d7139b0304e6f18f --><!-- empty --><\/p>\n<p>Researchers have unpacked a major cybersecurity find\u2014a malicious&nbsp;UEFI-based rootkit used in the wild since 2016 to ensure computers remained infected even if an operating system is reinstalled or a hard drive is completely replaced.<\/p>\n<p>The firmware compromises the UEFI, the low-level and highly opaque chain of firmware required to boot up nearly every modern computer. As the software that bridges a PC\u2019s device firmware with its operating system, the UEFI\u2014short for <a href=\"https:\/\/en.wikipedia.org\/wiki\/Unified_Extensible_Firmware_Interface\">Unified Extensible Firmware Interface<\/a>\u2014is an OS in its own right. It\u2019s located in an&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Serial_Peripheral_Interface\">SPI<\/a>-connected flash storage chip soldered onto the computer motherboard, making it difficult to inspect or patch the code. Because it\u2019s the first thing to run when a computer is turned on, it influences the OS, security apps, and all other software that follows.<\/p>\n<h2>Exotic, yes. Rare, no.<\/h2>\n<p>On Monday, researchers from Kaspersky <a href=\"https:\/\/securelist.com\/cosmicstrand-uefi-firmware-rootkit\/106973\/\">profiled CosmicStrand<\/a>, the security firm\u2019s name for a sophisticated UEFI rootkit that the company detected and obtained through its antivirus software. The find is among only a handful of such UEFI threats known to have been used in the wild. Until recently, researchers assumed that the technical demands required to develop UEFI malware of this caliber put it out of reach of most threat actors. Now, with Kaspersky attributing CosmicStrand to an unknown Chinese-speaking hacking group with possible ties to cryptominer malware, this type of malware may not be so rare after all.<\/p>\n<p>\u201cThe most striking aspect of this report is that this UEFI implant seems to have been used in the wild since the end of 2016\u2014long before UEFI attacks started being publicly described,\u201d Kaspersky researchers wrote. \u201cThis discovery begs a final question: If this is what the attackers were using back then, what are they using today?\u201d <\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<p>While researchers from fellow security firm Qihoo360 <a href=\"https:\/\/bbs.360.cn\/thread-14959110-1-1.html\">reported<\/a> on an earlier variant of the rootkit in 2017, Kaspersky and most other Western-based security firms didn\u2019t take notice. Kaspersky\u2019s newer research describes in detail how the rootkit\u2014found in firmware images of some Gigabyte or Asus motherboards\u2014is able to hijack the boot process of infected machines. The technical underpinnings attest to the sophistication of the malware.<\/p>\n<p>A rootkit is a piece of malware that runs in the deepest regions of the operating system it infects. It leverages this strategic position to hide information about its presence from the operating system itself. A bootkit, meanwhile, is malware that infects the boot process of a machine in order to persist on the system. The successor to legacy BIOS, UEFI is a technical standard defining how components can participate in the startup of an OS. It\u2019s the most \u201crecent\u201d one, as it was introduced around 2006. Today, almost all devices support UEFI when it comes to the boot process. The key point here is that when we say something takes place at the UEFI level, it means that it happens when the computer is starting up, before the operating system has even been loaded. Whatever standard is being used during that process is only an implementation detail, and in 2022, it will almost always be UEFI anyway.<\/p>\n<p>In an email, Kaspersky researcher Ivan Kwiatkowski wrote:<\/p>\n<blockquote>\n<p>So a rootkit may or may not be a bootkit, depending on where it is installed on the victim\u2019s machine. A bootkit may or may not be a rootkit, as long as it infected a component used for the system startup (but considering how low-level these usually are, bootkits will usually be rootkits). And firmware is one of the components which can be infected by bootkits, but there are others, too. CosmicStrand happens to be all of these at the same time: It has the stealthy rootkit capabilities and infects the boot process through malicious patching of the firmware image of motherboards.<\/p>\n<\/blockquote>\n<p>The workflow of CosmicStrand consists of setting \u201chooks\u201d at carefully selected points in the boot process. Hooks are modifications to the normal execution flow. They usually come in the form of additional code developed by the attacker, but in some cases, a legitimate user may inject code before or after a particular function to bring about new functionality.<\/p>\n<p>The CosmicStrand workflow looks like this:<\/p>\n<blockquote>\n<ul>\n<li aria-level=\"1\"><span>The initial infected firmware bootstraps the whole chain.<\/span><\/li>\n<li aria-level=\"1\"><span>The malware sets up a malicious hook in the boot manager, allowing it to modify Windows\u2019 kernel loader before it is executed.<\/span><\/li>\n<li aria-level=\"1\"><span>By tampering with the OS loader, the attackers are able to set up another hook in a function of the Windows kernel.<\/span><\/li>\n<li aria-level=\"1\"><span>When that function is later called during the normal startup procedure of the OS, the malware takes control of the execution flow one last time.<\/span><\/li>\n<li aria-level=\"1\"><span>It deploys a shellcode in memory and contacts the C2 server to retrieve the actual malicious payload to run on the victim\u2019s machine.<\/span><\/li>\n<\/ul>\n<\/blockquote>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/33673\/Discovery-Of-New-UEFI-Rootkit-Exposes-An-Ugly-Truth-The-Attacks-Are-Invisible-To-Us.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":47691,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[277],"tags":[10116],"class_list":["post-47690","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity-blogs","tag-headlinehackerprivacymalwaredata-lossbackdoor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Discovery Of New UEFI Rootkit Exposes An Ugly Truth: 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