{"id":2558,"date":"2026-04-17T01:05:46","date_gmt":"2026-04-17T01:05:46","guid":{"rendered":"https:\/\/blog.ibvl.in\/index.php\/2026\/04\/17\/lumma-stealer-infection-with-sectop-rat-arechclient2-fri-apr-17th\/"},"modified":"2026-04-17T01:05:46","modified_gmt":"2026-04-17T01:05:46","slug":"lumma-stealer-infection-with-sectop-rat-arechclient2-fri-apr-17th","status":"publish","type":"post","link":"https:\/\/blog.ibvl.in\/index.php\/2026\/04\/17\/lumma-stealer-infection-with-sectop-rat-arechclient2-fri-apr-17th\/","title":{"rendered":"Lumma Stealer infection with Sectop RAT (ArechClient2), (Fri, Apr 17th)"},"content":{"rendered":"<div>\n<p><em><strong>Introduction<\/strong><\/em><\/p>\n<p>This diary provides indicators from a <a href=\"https:\/\/malpedia.caad.fkie.fraunhofer.de\/details\/win.lumma\">Lumma Stealer<\/a> infection that was followed by <a href=\"https:\/\/malpedia.caad.fkie.fraunhofer.de\/details\/win.sectop_rat\">Sectop RAT<\/a> (ArechClient2). I searched for cracked versions of popular copyright-protected software, and I downloaded the initial malware after following the results of one such search. This is a common distribution technique for various families of malware, and I often find Lumma Stealer this way.<\/p>\n<p>In this case, the initial malware for Lumma Stealer was delivered as a password-protected 7-zip archive. The extracted malware is an inflated Windows executable (EXE) file at 806 MB. The EXE is padded with null-bytes (0x00), a technical which increases the EXE size while allowing the compressed archive file to be much smaller. The password-protected archive and inflated EXE file are designed to avoid detection.<\/p>\n<p><em><strong>Images from the infection<\/strong><\/em><\/p>\n<p><a href=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-01a.jpg\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-01.jpg\" style=\"border-width: 2px; border-style: solid;\"><\/a><br \/>\n<em>Shown above: Example of a page with instructions to download the initial malware file.<\/em><\/p>\n<p><a href=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-02a.jpg\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-02.jpg\" style=\"border-width: 2px; border-style: solid;\"><\/a><br \/>\n<em>Shown above: Traffic from the infection filtered in Wireshark.<\/em><\/p>\n<p><a href=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-03a.jpg\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/isc.sans.edu\/diaryimages\/images\/2026-04-17-ISC-diary-image-03.jpg\" style=\"border-width: 2px; border-style: solid;\"><\/a><br \/>\n<em>Shown above: Sectop RAT persistent on an infected Windows host.<\/em><\/p>\n<p><em><strong>Indicators of Compromise<\/strong><\/em><\/p>\n<p>Example of download link from the site advertising cracked versions of copyright-protected software:<\/p>\n<p style=\"margin-left: 40px;\"><span style=\"font-family:Courier New,Courier,monospace;\">hxxps[:]\/\/incolorand[.]com\/how-visual-patch-enhances-ui-consistency-across-releases\/?utm_source={CID}&amp;utm_term=Adobe%20Premiere%20Pro%20(2026)%20Full%20v26.0.2%20Espa%C3%B1ol%20[Mega]&amp;utm_content={SUBID1}&amp;utm_medium={SUBID2}<\/span><\/p>\n<p>Example of URL for page with the file download instructions:<\/p>\n<p style=\"margin-left: 40px;\"><span style=\"font-family:Courier New,Courier,monospace;\">hxxps[:]\/\/mega-nz.goldeneagletransport[.]com\/Adobe_Premiere_Pro_%282026%29_Full_v26.0.2_Espa%C3%B1ol_%5BMega%5D.zip?c=ABUZ4WkRgQUA_YUCAFVTFwASAAAAAACh&amp;s=360721<\/span><\/p>\n<p>Example of URL for file download from site above site impersonating MEGA:<\/p>\n<p style=\"margin-left: 40px;\"><span style=\"font-family:Courier New,Courier,monospace;\">hxxps[:]\/\/arch.primedatahost3[.]cfd\/auth\/media\/JvWcFd5vUoYTrImvtWQAASTh\/Adobe_Premiere_Pro_(2026)_Full_v26.0.2_Espa%C3%B1ol_%5BMega%5D.zip<\/span><\/p>\n<p>Downloaded file:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li>SHA256 hash: <a href=\"https:\/\/www.virustotal.com\/gui\/file\/c7489e3bf546c5f2d958ac833cc7dbca4368dfba03a792849bc99c48a6b2a14f\"><span style=\"font-family:Courier New,Courier,monospace;\">c7489e3bf546c5f2d958ac833cc7dbca4368dfba03a792849bc99c48a6b2a14f<\/span><\/a><\/li>\n<li>File size: 3,888,051 bytes<\/li>\n<li>File name: <span style=\"font-family:Courier New,Courier,monospace;\">adobe_premiere_pro_(2026)_full_v26.0.2_espan?ol_[mega].7z<\/span><\/li>\n<li>File type: 7-zip archive data, version 0.4<\/li>\n<li>File description: Password-protected 7-zip archive<\/li>\n<li>Password: 6919<\/li>\n<\/ul>\n<p>Extracted malware:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li>SHA256 hash: <span style=\"font-family:Courier New,Courier,monospace;\">4849f76dafbef516df91fecfc23a72afffaf77ade51f805eae5ad552bed88923<\/span><\/li>\n<li>File size: 806,127,604 bytes<\/li>\n<li>File name: <span style=\"font-family:Courier New,Courier,monospace;\">appFile.exe<\/span><\/li>\n<li>File type: PE32 executable (GUI) Intel 80386, for MS Windows<\/li>\n<li>File description: Inflated Windows EXE file for Lumma Stealer, padded with null-bytes<\/li>\n<\/ul>\n<p>Deflated malware:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li>SHA256 hash: <a href=\"https:\/\/www.virustotal.com\/gui\/file\/353ddce78d58aef2083ca0ac271af93659cf0039b0b29d0d169fc015bd3610bc\"><span style=\"font-family:Courier New,Courier,monospace;\">353ddce78d58aef2083ca0ac271af93659cf0039b0b29d0d169fc015bd3610bc<\/span><\/a><\/li>\n<li>File size: 7,114,156 bytes<\/li>\n<li>File type: PE32 executable (GUI) Intel 80386, for MS Windows<\/li>\n<li>File description: Above <span style=\"font-family:Courier New,Courier,monospace;\">appFile.exe<\/span> with most of null-byte padding removed<\/li>\n<li><a href=\"https:\/\/app.any.run\/tasks\/da962798-e18c-4e47-9379-81ffd72584ff\">Any.Run sandbox analysis<\/a>\u00a0<\/li>\n<li><a href=\"https:\/\/tria.ge\/260416-wfgr7sbt6y\">Triage sandbox analysis<\/a><\/li>\n<\/ul>\n<p>Lumma Stealer command and control (C2) domains from Triage sandbox analysis:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li><span style=\"font-family:Courier New,Courier,monospace;\">cankgmr[.]cyou<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">carytui[.]vu<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">decrnoj[.]club<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">genugsq[.]best<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">longmbx[.]click<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">mushxhb[.]best<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">pomflgf[.]vu<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">strikql[.]shop<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">ulmudhw[.]shop<\/span><\/li>\n<\/ul>\n<p>Follow-up malware:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li>SHA256 hash: <a href=\"https:\/\/www.virustotal.com\/gui\/file\/d9b576eb6827f38e33eda037d2cda4261307511303254a8509eeb28048433b2f\"><span style=\"font-family:Courier New,Courier,monospace;\">d9b576eb6827f38e33eda037d2cda4261307511303254a8509eeb28048433b2f<\/span><\/a><\/li>\n<li>File size: 16,450,560 bytes<\/li>\n<li>File type: PE32+ executable (DLL) (GUI) x86-64, for MS Windows<\/li>\n<li>Retrieved from: <span style=\"font-family:Courier New,Courier,monospace;\">hxxps[:]\/\/enotsosun[.]pw\/NetGui.dll<\/span><\/li>\n<li>Saved to: <span style=\"font-family:Courier New,Courier,monospace;\">C:Users<\/span><em><span style=\"font-family:Times New Roman,Times,serif;\">[username]<\/span><\/em><span style=\"font-family:Courier New,Courier,monospace;\">AppDataLocalTemp16XBPQ29ZBG94TYNOA.dll<\/span><\/li>\n<li>File description: 64-bit DLL to install and run Sectop RAT (ArechClient2)<\/li>\n<li>Run method: <span style=\"font-family:Courier New,Courier,monospace;\">rundll32 <\/span><em><span style=\"font-family:Times New Roman,Times,serif;\">[file path]<\/span><\/em><span style=\"font-family:Courier New,Courier,monospace;\">,LoadForm<\/span><\/li>\n<li><a href=\"https:\/\/app.any.run\/tasks\/3cb39011-e845-410d-83e3-cfebb69a68b7\">Any.Run sandbox analysis<\/a><\/li>\n<li><a href=\"https:\/\/tria.ge\/260416-zmr4asdx3v\">Triage sandbox analysis<\/a><\/li>\n<\/ul>\n<p>Example of Sectop RAT C2 traffic from an infected Windows host:<\/p>\n<ul style=\"margin-left: 40px;\">\n<li><span style=\"font-family:Courier New,Courier,monospace;\">hxxp[:]\/\/91.92.241[.]102:9000\/wmglb<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">hxxp[:]\/\/91.92.241[.]102:9000\/wbinjget?q=66B553A8B94CE37C16F4EBC863D51FCC<\/span><\/li>\n<li><span style=\"font-family:Courier New,Courier,monospace;\">tcp[:]\/\/91.92.241[.]102:443\/<\/span> &#8211; encoded or otherwise encrypted traffic (not HTTPS\/TLS)<\/li>\n<\/ul>\n<p>&#8212;<br \/>\nBradley Duncan<br \/>\nbrad [at] malware-traffic-analysis.net<\/p>\n<p> (c) SANS Internet Storm Center. https:\/\/isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Introduction This diary provides indicators from a Lumma Stealer infection that was followed by Sectop RAT (ArechClient2). I searched for cracked versions of popular copyright-protected software, and I downloaded the initial malware after following the results of one such search. This is a common distribution technique for various families of malware, and I often find [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[90],"tags":[91],"class_list":["post-2558","post","type-post","status-publish","format-standard","hentry","category-cybersecurity","tag-cybersecurity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Lumma Stealer infection with Sectop RAT (ArechClient2), (Fri, Apr 17th) - Imperative Business Ventures Limited<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.ibvl.in\/index.php\/2026\/04\/17\/lumma-stealer-infection-with-sectop-rat-arechclient2-fri-apr-17th\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lumma Stealer infection with Sectop RAT (ArechClient2), (Fri, Apr 17th) - Imperative Business Ventures Limited\" \/>\n<meta property=\"og:description\" content=\"Introduction This diary provides indicators from a Lumma Stealer infection that was followed by Sectop RAT (ArechClient2). 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I searched for cracked versions of popular copyright-protected software, and I downloaded the initial malware after following the results of one such search. 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