{"id":48629,"date":"2022-09-28T17:00:07","date_gmt":"2022-09-28T17:00:07","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/want-to-sneak-a-rat-into-windows-buy-quantum-builder-on-the-dark-web\/"},"modified":"2022-09-28T17:00:07","modified_gmt":"2022-09-28T17:00:07","slug":"want-to-sneak-a-rat-into-windows-buy-quantum-builder-on-the-dark-web","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/want-to-sneak-a-rat-into-windows-buy-quantum-builder-on-the-dark-web\/","title":{"rendered":"Want to sneak a RAT into Windows? Buy Quantum Builder on the dark web"},"content":{"rendered":"<p>A tool sold on the dark web that allows cybercriminals to build malicious shortcuts for delivering malware is being used in a campaign pushing a longtime .NET keylogger and remote access trojan (RAT) named Agent Tesla.<\/p>\n<p>The customizable tool, Quantum Builder (also known as Quantum LNK Builder), was <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/cyware.com\/news\/quantum-builder-a-tool-to-create-malicious-shortcut-files-ca4e2035\">seen for sale<\/a> on cybercriminal markets in June by security researchers with Cyware. Quantum Builder lets attackers to create malicious Microsoft Windows LNK shortcuts.<\/p>\n<p>Through the shortcuts, cybercriminals can create and deliver malicious payloads using legitimate system tools like PowerShell and Microsoft HTML Application (HTA) files.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>In a <a target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.zscaler.com\/blogs\/security-research\/agent-tesla-rat-delivered-quantum-builder-new-ttps\">report<\/a> this week, researchers detected a campaign using Quantum Builder to deliver <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2020\/04\/21\/bitdefender_opec_attacks\/\" rel=\"noopener\">Agent Tesla<\/a>, malware that has been around since 2014 and has been used to steal sensitive information from a victim&#8217;s device, including user credentials, credentials from browsers, keystrokes, and clipboard data.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>Quantum Builder has been linked to the advanced persistent threat (APT) gang Lazarus Group, based on shared tactics, techniques, and procedures (TTPs) and overlaps in source code, but they can&#8217;t with any confidence attribute the current campaign to Lazarus or any particular threat group.<\/p>\n<h3 class=\"crosshead\">Malware as a service is cheaper than you think<\/h3>\n<p>Quantum Builder, which Cyware says could be had for about $200 for two months of access to up to $950 for lifetime access, can generate LNK, HTA, and ISO payloads that include sophisticated download techniques and deliver the final payload via a multi-staged attack chain.<\/p>\n<p>That includes decrypting In-memory PowerShell scripts using the HTA file to bypass User Account Control (UAC) through Microsoft Connection Manager Profile Installer (CMSTP) \u2013 a program used to install Connection Manager service profiles \u2013 to launch Agent Tesla with administrative rights.<\/p>\n<p>UAC Bypass also is used to run Windows Defenders exclusions on the system.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,\" data-sm=\",fluid,mpu,\" data-md=\",fluid,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Quantum Builder has other techniques to evade detection and camouflage tactics, including using living-off-the-land binaries (LOLBins), which are legitimate Microsoft tools. It also &#8220;incorporates techniques like decoys, UAC Prompts and in-memory PowerShell to execute the final payload,&#8221; the researchers found, adding that &#8220;these Techniques&nbsp;are regularly updated by the Developers of the Quantum Builder.&#8221;<\/p>\n<p>The infection chain starts with a spearphishing email whose subject line is an order confirmation from GuangDong Nanz Technology, a Chinese manufacturing company. The email includes the LNK file bundled as a GZIP archive that, once executed by the victim, activates the embedded PowerShell codes that launches MSHTA, which then executives the HTA file that is hosted on a remote server.<\/p>\n<p>&#8220;The HTA File then decrypts a PowerShell loader script which decrypts and loads another PowerShell script after performing AES Decryption and GZIP Decompression,&#8221; they wrote. &#8220;The decrypted PowerShell script is the Downloader PS Script, which first downloads the Agent Tesla binary from a remote server, and then executes it with administrative privileges by performing a UAC Bypass using the CMSTP.&#8221;&nbsp;<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\" rel=\"noopener\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_security\/research&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33YzSOlGO73I3rk7KfFIAilQAAANQ&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>Agent Tesla is then executed on the victim&#8217;s machine with administrative privileges.<\/p>\n<p>ThreatLabz analysts found multiple samples that use a various of the infection chain to deliver Agent Tesla, with the LNK file bundled in a ZIP archive. In this situation, the LNK file also executes the HTA file hosted on the remote server by decoding a command through converting the integers in the command into characters and replacing whitespaces. It also uses MSHTA to execute the HTA file from a remote URL.<\/p>\n<p>In their report in June, the Cyware team said there were advantages to attackers using LNK extensions. Windows by default hides the LNK extension, so if a file has a .lnk extension, only the file name and .txt extension will appear to the user. Because of this, there is a high probability of users being fooled into clicking on this type of file, they wrote.<\/p>\n<p>In addition, &#8220;when the LNK files are run, they can execute PowerShell code that can be leveraged to perform further actions,&#8221; the Cyware researchers wrote. &#8220;In this specific case, it runs an HTML application file hosted on Quantum&#8217;s website using a legitimate Windows utility that&#8217;s used to run HTA files, MSHTA.&#8221;<\/p>\n<p>Quantum Builder has been used by threat groups in a number of campaigns to deliver a range of malware families, including RedLine Stealer (which like Agent Tesla steals credentials as well as credit card information and other data), <a target=\"_blank\" href=\"https:\/\/www.theregister.com\/2022\/03\/29\/icedid_microsoft_exchange_phishing\/\" rel=\"noopener\">IcedID<\/a> (banking trojan), GuLoader (advanced downloader), and Remcos RAT and AsyncRAT.<\/p>\n<p>&#8220;Threat actors are continuously evolving their tactics and making use of malware builders sold on the cybercrime marketplace,&#8221; they wrote. &#8220;This Agent Tesla campaign is the latest in a string of attacks in which Quantum Builder has been used to create malicious payloads in campaigns against various organizations.&#8221;<\/p>\n<p>The campaign &#8220;incorporates sophisticated techniques to evade detections, and the techniques are updated regularly by the developers,&#8221; they added. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2022\/09\/28\/quantum_builder_agent_tesla_rat\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Beware what could be hiding in those LNK shortcuts A tool sold on the dark web that allows cybercriminals to build malicious shortcuts for delivering malware is being used in a campaign pushing a longtime .NET keylogger and remote access trojan (RAT) named Agent Tesla.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-48629","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Want to sneak a RAT into Windows? 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