{"id":49640,"date":"2022-12-09T14:28:15","date_gmt":"2022-12-09T14:28:15","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/34127\/North-Korean-Hackers-Exploit-Internet-Explorers-Leftover-Bits.html"},"modified":"2022-12-09T14:28:15","modified_gmt":"2022-12-09T14:28:15","slug":"north-korean-hackers-exploit-internet-explorers-leftover-bits","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/north-korean-hackers-exploit-internet-explorers-leftover-bits\/","title":{"rendered":"North Korean Hackers Exploit Internet Explorer&#8217;s Leftover Bits"},"content":{"rendered":"<figure class=\"intro-image intro-left\"> <img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/north-korea-flag-ie-800x450.jpg\" alt=\"Internet Explorer logo embedded in North Korean flag\"><figcaption class=\"caption\">\n<div class=\"caption-text\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/north-korea-flag-ie.jpg\" class=\"enlarge-link\" data-height=\"1080\" data-width=\"1920\">Enlarge<\/a> <span class=\"sep\">\/<\/span> APT37, a group believed to be backed by the North Korean government, has found success exploiting the bits of Internet Explorer still present in various Windows-based apps.<\/div>\n<div class=\"caption-credit\">Aurich Lawson | 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=\"0 posters participating\" class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/information-technology\/2022\/12\/north-korean-hackers-once-again-exploit-internet-explorers-leftover-bits\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">26<\/span> <span class=\"visually-hidden\"> with 0 posters participating<\/span> <\/a> <\/p>\n<div class=\"share-links\">\n<h4>Share this story<\/h4>\n<\/p><\/div>\n<\/aside>\n<p> <!-- cache hit 7:single\/related:25f57318b6b37019eee76f780a33e318 --><!-- empty --><\/p>\n<p>Microsoft&#8217;s Edge browser has replaced Internet Explorer in almost every regard, but some exceptions remain. One of those, deep inside Microsoft Word, was exploited by a North-Korean-backed group this fall, Google security researchers claim.<\/p>\n<p>It&#8217;s <a href=\"https:\/\/www.volexity.com\/blog\/2021\/08\/17\/north-korean-apt-inkysquid-infects-victims-using-browser-exploits\/\">not the first time<\/a> the government-backed APT37 has utilized Internet Explorer&#8217;s lingering presence, as Google&#8217;s Threat Analysis Group (TAG) notes <a href=\"https:\/\/blog.google\/threat-analysis-group\/internet-explorer-0-day-exploited-by-north-korean-actor-apt37\/\">in a blog post<\/a>. APT37 has had repeated success targeting South Korean journalists and activists, plus North Korean defectors, through a limited but still successful Internet Explorer pathway.<\/p>\n<p>The last exploit targeted those heading to <a href=\"https:\/\/www.dailynk.com\/english\/\">Daily NK<\/a>, a South Korean site dedicated to North Korean news. This one involved the <a href=\"https:\/\/www.washingtonpost.com\/investigations\/2022\/11\/16\/seoul-crowd-crush-itaewon-victims\/\">Halloween crowd crush in Itaewon<\/a>, which killed at least 151 people. A Microsoft Word .docx document, named as if it were timed and dated less than two days after the incident&nbsp;and labeled &#8220;accident response situation,&#8221; started circulating. South Korean users began <a href=\"https:\/\/www.virustotal.com\/gui\/file\/926a947ea2b59d3e9a5a6875b4de2bd071b15260370f4da5e2a60ece3517a32f\/\">submitting the document<\/a> to the Google-owned VirusTotal, where it was flagged with <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2017-0199\">CVE-2017-0199<\/a>, a long-known vulnerability in Word and WordPad.<\/p>\n<figure class=\"image shortcode-img center large\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/doc_exploit.png\" class=\"enlarge\" data-height=\"715\" data-width=\"1000\" alt=\"The document in question purports to be related to a deadly crowd panic in late October in Itaewon, South Korea.\"><img loading=\"lazy\" decoding=\"async\" alt=\"The document in question purports to be related to a deadly crowd panic in late October in Itaewon, South Korea.\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/doc_exploit-640x458.png\" width=\"640\" height=\"458\" srcset=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/doc_exploit.png 2x\"><\/a><figcaption class=\"caption\">\n<div class=\"caption-text\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2022\/12\/doc_exploit.png\" class=\"enlarge-link\" data-height=\"715\" data-width=\"1000\">Enlarge<\/a> <span class=\"sep\">\/<\/span> The document in question purports to be related to a deadly crowd panic in late October in Itaewon, South Korea.<\/div>\n<\/figcaption><\/figure>\n<p>Just as <a href=\"https:\/\/arstechnica.com\/information-technology\/2017\/04\/booby-trapped-word-documents-in-the-wild-exploit-critical-microsoft-0day\/\">in April 2017<\/a>, the document, if you click to allow Word\/WordPad to view it outside the no-download &#8220;Protected View,&#8221; downloads a rich text template from an attacker-controlled server, then grabs more HTML that looks like Rich Text Format templates. Office and WordPad intrinsically use Internet Explorer to render HTML in what Microsoft describes as &#8220;specially crafted files,&#8221; giving attackers a way to then bring in various malware payloads. While <a href=\"https:\/\/arstechnica.com\/information-technology\/2017\/04\/critical-word-0day-is-only-1-of-3-microsoft-bugs-under-attack\/\">patched that same month<\/a>, the vulnerability persisted; it was one of the vectors <a href=\"https:\/\/www.automox.com\/blog\/petya-attack-unpatched-cves\">exploited in a Petya wave more than a year later.<\/a><\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<p>The specific vulnerability has to do with Internet Explorer&#8217;s JavaScript engine. An error during just-in-time optimization leads to <a href=\"https:\/\/bugs.chromium.org\/p\/project-zero\/issues\/detail?id=2188&amp;q=jscript9&amp;can=1\">a data type confusion and memory writing<\/a>. This particular exploit also cleaned up after itself, clearing the Internet Explorer cache and history of its presence. While Google&#8217;s TAG doesn&#8217;t know what payloads were delivered, APT37 has previously circulated exploits that triggered <a href=\"https:\/\/www.volexity.com\/blog\/2021\/08\/17\/north-korean-apt-inkysquid-infects-victims-using-browser-exploits\/\">BLUELIGHT<\/a>, <a href=\"https:\/\/blog.talosintelligence.com\/rokrat-reloaded\/\">ROKRAT<\/a>, and <a href=\"https:\/\/www.welivesecurity.com\/2022\/11\/30\/whos-swimming-south-korean-waters-meet-scarcrufts-dolphin\/\">DOLPHIN,<\/a> all focusing on North Korean political and economic interests. (North Korean hackers aren&#8217;t <a href=\"https:\/\/arstechnica.com\/information-technology\/2022\/03\/north-korean-hackers-unleashed-chrome-0-day-exploit-on-hundreds-of-us-targets\/\">averse to a Chrome exploit<\/a>, though.)<\/p>\n<p>Microsoft <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/vulnerability\/CVE-2022-41128\">patched the specific exploit in its JScript engine<\/a>, but this being the fifth year of remote-code Word doc attacks, it seems like they&#8217;ll be around for a while longer. And North Korean actors will be eager to act on them.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/34127\/North-Korean-Hackers-Exploit-Internet-Explorers-Leftover-Bits.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":49641,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[277],"tags":[10303],"class_list":["post-49640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity-blogs","tag-headlinehackermicrosoftcyberwarkorea"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>North Korean Hackers Exploit Internet Explorer&#039;s Leftover Bits 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta 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