{"id":27645,"date":"2019-07-03T15:46:06","date_gmt":"2019-07-03T15:46:06","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/30284\/First-Ever-Malware-Strain-Spotted-Abusing-New-DoH-Protocol.html"},"modified":"2019-07-03T15:46:06","modified_gmt":"2019-07-03T15:46:06","slug":"first-ever-malware-strain-spotted-abusing-new-doh-protocol","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/first-ever-malware-strain-spotted-abusing-new-doh-protocol\/","title":{"rendered":"First-Ever Malware Strain Spotted Abusing New DoH Protocol"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/zdnet2.cbsistatic.com\/hub\/i\/r\/2019\/02\/28\/0752902d-f57c-45c0-8e15-aaa31ca190e1\/thumbnail\/770x578\/5e75278dd91e8371166a9563990ad846\/graph-network-globe.jpg\" class=\"ff-og-image-inserted\"><\/div>\n<p>Security researchers from Netlab, a network threat hunting unit of Chinese cyber-security giant Qihoo 360, have discovered the first ever malware strain seen abusing the DNS over HTTPS (DoH) protocol.<\/p>\n<p>The malware, <a href=\"https:\/\/blog.netlab.360.com\/an-analysis-of-godlua-backdoor-en\/\" target=\"_blank\" rel=\"noopener noreferrer\">named Godlua<\/a>, was detailed in a report published on Monday by the company&#8217;s researchers.<\/p>\n<p>According to the Netlab team, Godlua is a malware strain written in Lua, which acts like a backdoor on infected systems. It&#8217;s written to work on Linux servers, attackers are using a Confluence exploit (CVE-2019-3396) to infect outdated systems, and early samples uploaded on VirusTotal have mislabeled it as a cryptocurrency miner.<\/p>\n<p>But Netlab researchers say the malware actually works as a DDoS bot and they&#8217;ve already seen it being used in attacks, with one aimed against liuxiaobei.com, the homepage of a Liu Xiaobei fan site.<\/p>\n<h3>DoH helps malware avoid passive DNS monitoring<\/h3>\n<p>Researchers say they&#8217;ve spotted two Godlua versions so far, with a somewhat similar architecture. Both versions used DNS over HTTPS requests to retrieve the TXT (text record) of a domain name, where the URL of a subsequent command and control (C&amp;C) server was being stored, and to which the Godlua malware was supposed to connect for further instructions.<\/p>\n<p>This technique of retrieving the URL addresses of second\/third stage C&amp;C server from DNS text records isn&#8217;t new. The newness here is the usage of a DoH request instead of a classical DNS request.<\/p>\n<p>As the protocol&#8217;s name clearly states, DNS over HTTPS works by sending DNS requests via an encrypted HTTPS connection, rather than using a classic plaintext UDP request.<\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_ZD_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\">\n<\/section>\n<p>The DoH (DNS) request is encrypted and invisible to third-party observers, including cyber-security software that relies on passive DNS monitoring to block requests to known malicious domains.<\/p>\n<h3>Looming problem for cyber-security community<\/h3>\n<p>The discovery that Godlua uses DoH to hide DNS traffic sent shockwaves through the cyber-security community this week, with many reacting on both Twitter [<a href=\"https:\/\/twitter.com\/infosec_nick\/status\/1146069799899938816\" target=\"_blank\" rel=\"noopener noreferrer\">1<\/a>, <a href=\"https:\/\/twitter.com\/GossiTheDog\/status\/1146138461969244160\" target=\"_blank\" rel=\"noopener noreferrer\">2<\/a>] and <a href=\"https:\/\/www.reddit.com\/r\/netsec\/comments\/c8mga8\/first_malware_known_to_have_used_dns_over_https\/\" target=\"_blank\" rel=\"noopener noreferrer\">Reddit<\/a>.<\/p>\n<div class=\"twitterContainer\" readability=\"5.8097345132743\">\n<blockquote class=\"twitter-tweet\" readability=\"5.3628318584071\">\n<p lang=\"en\" dir=\"ltr\">DNS requests aren&#8217;t the only IOC, but they&#8217;re leaned-on heavily.<\/p>\n<p>\u2014 Wesley McGrew (@McGrewSecurity) <a href=\"https:\/\/twitter.com\/McGrewSecurity\/status\/1146417077722451968?ref_src=twsrc%5Etfw\">July 3, 2019<\/a><\/p><\/blockquote>\n<\/div>\n<p>Many have expressed fears that other malware strains will now also adopt this feature, rendering a large chunk of cyber-security products that rely on passive DNS monitoring useless.<\/p>\n<p>Their fear is justified; however, the cyber-security community has always found workarounds to any tricks malware employs, and it&#8217;s expected they&#8217;ll find one to deal with any strains that use DoH, as well.<\/p>\n<p>More info on the DoH protocol can be found in the Internet Engineering Task Force&#8217;s (IETF) document <a href=\"https:\/\/datatracker.ietf.org\/doc\/rfc8484\/\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 8484<\/a>.<\/p>\n<p>Major browsers like Firefox and Chrome already support DoH. Last month, <a href=\"https:\/\/security.googleblog.com\/2019\/06\/google-public-dns-over-https-doh.html\" target=\"_blank\" rel=\"noopener noreferrer\">Google announced DoH support for its public DNS service<\/a>, which the company provides for free to users in countries where governments are filtering and blocking internet traffic based on passive DNS monitoring.<\/p>\n<h3>Related malware and cybercrime coverage:<\/h3>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/30284\/First-Ever-Malware-Strain-Spotted-Abusing-New-DoH-Protocol.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":27646,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[6971],"class_list":["post-27645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinemalwarelinuxdnsdenial-of-service"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>First-Ever Malware Strain Spotted Abusing New DoH Protocol 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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