{"id":37607,"date":"2020-10-07T15:47:03","date_gmt":"2020-10-07T15:47:03","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/31642\/Hackers-Exploit-Windows-Error-Reporting-Service-In-New-Fileless-Attack.html"},"modified":"2020-10-07T15:47:03","modified_gmt":"2020-10-07T15:47:03","slug":"hackers-exploit-windows-error-reporting-service-in-new-fileless-attack","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/hackers-exploit-windows-error-reporting-service-in-new-fileless-attack\/","title":{"rendered":"Hackers Exploit Windows Error Reporting Service In New Fileless Attack"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/zdnet2.cbsistatic.com\/hub\/i\/r\/2020\/10\/07\/5678d330-48d7-416d-a933-84c84c8c1936\/thumbnail\/770x578\/e2122f0359565f48e5ab1d8525de606a\/screenshot-2020-10-07-at-07-12-17.png\" class=\"ff-og-image-inserted\"><\/div>\n<p>A new fileless attack technique that abuses the Microsoft Windows Error Reporting (WER) service is the work of a hacking group that is yet to be identified.&nbsp;<\/p>\n<p>According to Malwarebytes security researchers Hossein Jazi and J\u00e9r\u00f4me Segura, the attack vector relies on malware burying itself in WER-based executables to avoid arousing suspicion.<\/p>\n<p>In <a href=\"https:\/\/blog.malwarebytes.com\/malwarebytes-news\/2020\/10\/kraken-attack-abuses-wer-service\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\" data-component=\"externalLink\">a blog post<\/a> on Tuesday, the duo said the new &#8220;Kraken&#8221; attack &#8212; albeit not a completely novel technique in itself &#8212; was detected on September 17.&nbsp; <\/p>\n<p><strong>See also:&nbsp;<\/strong><a href=\"https:\/\/www.zdnet.com\/article\/researchers-track-hacking-fingerprints-link-russian-group-to-windows-exploits\/\" target=\"_blank\" rel=\"noopener noreferrer\">Researchers track hacking &#8216;fingerprints,&#8217; link Russian attackers to Windows exploit sellers<\/a> <\/p>\n<p>A lure phishing document found by the team was packaged up in a .ZIP file. Titled, &#8220;Compensation manual.doc,&#8221; the file claims to contain information relating to worker compensation rights, but when opened, is able to trigger a malicious macro.&nbsp; <\/p>\n<p>The macro uses a custom version of the CactusTorch VBA module to spring a fileless attack, made possible through shellcode.&nbsp; <\/p>\n<p>CactusTorch is able to load a .Net compiled binary called &#8220;Kraken.dll&#8221; into memory and execute it via VBScript. This payload injects an embedded shellcode into <a href=\"https:\/\/social.technet.microsoft.com\/Forums\/ie\/en-US\/4032dc41-c813-4058-bba2-27317b38bf63\/werfaultexe?forum=w8itproappcompat#:~:text=The%20werfault.exe%20is%20used,to%20receive%20information%20about%20solutions.\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">WerFault.exe<\/a>, a process connected to the WER service and used by Microsoft to track and address operating system errors. <\/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;}\"> <\/section>\n<p>&#8220;That reporting service, WerFault.exe, is usually invoked when an error related to the operating system, Windows features, or applications happens,&#8221; Malwarebytes says. &#8220;When victims see WerFault.exe running on their machine, they probably assume that some error happened, while in this case they have actually been targeted in an attack.&#8221; <\/p>\n<p><strong>CNET:&nbsp;<\/strong><a href=\"https:\/\/www.cnet.com\/how-to\/amazon-doubles-down-on-echo-home-security-what-to-know\/?ftag=CMG-01-10aaa1b\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">Amazon doubles down on Echo home security. What to know<\/a> <\/p>\n<p>This technique is also used by <a href=\"https:\/\/www.zdnet.com\/article\/in-new-enterprise-attack-wave-netwire-rat-trojan-buries-itself-in-image-files\/\" target=\"_blank\" rel=\"noopener noreferrer\">NetWire<\/a> Remote Access Trojan (RAT) and the cryptocurrency-stealing <a href=\"https:\/\/www.zdnet.com\/article\/now-cerber-ransomware-wants-to-steal-your-bitcoin-wallets-and-passwords-too\/\" target=\"_blank\" rel=\"noopener noreferrer\">Cerber ransomware<\/a>.&nbsp; <\/p>\n<p>The shellcode is also commanded to make an HTTP request to a hard-coded domain, likely to download additional malware.&nbsp; <\/p>\n<p>Operators of Kraken follow up with several anti-analysis methods, including code obfuscation, forcing the DLL to operate in multiple threads, checking for sandbox or debugger environments, and scanning the registry to see if VMWare&#8217;s virtual machines or Oracle&#8217;s VirtualBox are running. The developers have programmed the malicious code to terminate if indicators are found of analysis activities.&nbsp; <\/p>\n<p><strong>TechRepublic:&nbsp;<\/strong><a href=\"https:\/\/www.techrepublic.com\/article\/how-to-boost-the-effectiveness-of-your-cybersecurity-operations\/?ftag=CMG-01-10aaa1b\" target=\"_blank\" rel=\"noopener noreferrer\" data-component=\"externalLink\">How to boost the effectiveness of your cybersecurity operations<\/a> <\/p>\n<p>The Kraken attack has proven to be difficult to attribute, at present. The hard-coded target URL of the malware was taken down at the time of analysis, and without this, clear markers indicating one APT or another are not possible.&nbsp; <\/p>\n<p>However, Malwarebytes says there are some elements that reminded researchers of APT32, also known as <a href=\"https:\/\/www.zdnet.com\/article\/bmw-and-hyundai-hacked-by-vietnamese-hackers-report-claims\/\" target=\"_blank\" rel=\"noopener noreferrer\">OceanLotus<\/a>, a Vietnamese APT believed to be responsible for attacks against BMW and Hyundai in 2019.&nbsp; <\/p>\n<h3> Previous and related coverage <\/h3>\n<hr>\n<p><strong>Have a tip?<\/strong> Get in touch securely via WhatsApp | Signal at +447713 025 499, or over at Keybase: charlie0<\/p>\n<hr>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/31642\/Hackers-Exploit-Windows-Error-Reporting-Service-In-New-Fileless-Attack.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":37608,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[235],"class_list":["post-37607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinemicrosoftflaw"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hackers Exploit Windows Error Reporting Service In New Fileless Attack 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, max-video-preview:-1\" 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