{"id":56504,"date":"2024-07-08T14:13:43","date_gmt":"2024-07-08T14:13:43","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/36078\/Avast-Secretly-Gave-DoNex-Ransomware-Decryptors-To-Victims.html"},"modified":"2024-07-08T14:13:43","modified_gmt":"2024-07-08T14:13:43","slug":"avast-secretly-gave-donex-ransomware-decryptors-to-victims","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/avast-secretly-gave-donex-ransomware-decryptors-to-victims\/","title":{"rendered":"Avast Secretly Gave DoNex Ransomware Decryptors To Victims"},"content":{"rendered":"<p><span class=\"label\">Updated<\/span> Researchers at Avast have provided decryptors to DoNex ransomware victims on the down-low since March after discovering a flaw in the crims&#8217; cryptography, the company confirmed today.<\/p>\n<p>They also published the decryptor for all to use now that the group appears to no longer present a serious threat in the cybersecurity landscape, after its dark web page was shut down in April.<\/p>\n<p>Delegates of Canada&#8217;s Recon conference, most recently held at the end of June, were the first to hear of the news announced publicly today. Avast offered a brief explanation about how DoNex encrypts victims&#8217; data, but annoyingly didn&#8217;t actually offer any insight into the flaw in its schema.<\/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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2ZowpvA5NMl9X8ZwQDGOuGwAAAFU&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>&#8220;During the ransomware execution, an encryption key is generated by CryptGenRandom() function,&#8221; Avast <a href=\"https:\/\/decoded.avast.io\/threatresearch\/decrypted-donex-ransomware-and-its-predecessors\/\" rel=\"nofollow\">says<\/a> in a blog post. &#8220;This key is then used to initialize ChaCha20 symmetric key and subsequently to encrypt files. After a file is encrypted, the symmetric file key is encrypted by RSA-4096 and appended to the end of the file. The files are picked by their extension, and file extensions are listed in the ransomware XML config.<\/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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZowpvA5NMl9X8ZwQDGOuGwAAAFU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>&#8220;For small files (up to 1 MB), the entire file is encrypted. For files with size greater than 1 MB, intermittent encryption is used \u2013 the file is split into blocks and those blocks are encrypted separately.&#8221;<\/p>\n<p>That&#8217;s all it was willing to share, however. <em>El Reg<\/em> pressed it for answers but the company didn&#8217;t immediately respond to questions.<\/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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44ZowpvA5NMl9X8ZwQDGOuGwAAAFU&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The decryptor itself is available as a free download and Avast recommends victims run it as administrator, preferably while using the 64-bit version.&nbsp;<\/p>\n<p>It says the password-cracking process is highly memory-intensive, but should only take about a second, so opt for the 64-bit version where possible.<\/p>\n<h3 class=\"crosshead\">What&#8217;s DoNex ransomware?<\/h3>\n<p>DoNex isn&#8217;t the most recognizable name in ransomware, but it has been around for a while under various guises.<\/p>\n<p>Avast reckons it started off in April 2022 under the name &#8220;Muse&#8221; before rebranding in November of that year to a fake version of LockBit 3.0.&nbsp;<\/p>\n<p>The genuine version was launched by <a href=\"https:\/\/www.theregister.com\/2024\/05\/07\/alleged_lockbit_kingpin_charged_sanctioned\/\">Dmitry Khoroshev&#8217;s gang<\/a> in June 2022 but the builder was <a href=\"https:\/\/www.theregister.com\/2022\/08\/22\/entrust_lockbit_ddos_ransomware\/\">leaked months later in September<\/a>, rumored to be the work of a disgruntled LockBit member, and DoNex&#8217;s imitation was one of many that spun up as a result.<\/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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZowpvA5NMl9X8ZwQDGOuGwAAAFU&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_specialfeatures\/malwaremonth&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33ZowpvA5NMl9X8ZwQDGOuGwAAAFU&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The ransom note of the fake version bore many similarities to the genuine article, with a few changes such as the contact address \u2013 victims weren&#8217;t actually dealing with LockBit after all.<\/p>\n<p>In May 2023, another rebrand was carried out, this time to what appeared to be a brand-new operation called DarkRace, claiming several victims mainly based in Italy, Malwarebytes <a href=\"https:\/\/www.threatdown.com\/blog\/ransomware-review-july-2023\/\" rel=\"nofollow\">said<\/a> last year. A Broadcom <a href=\"https:\/\/www.broadcom.com\/support\/security-center\/protection-bulletin\/darkrace-ransomware\" rel=\"nofollow\">advisory<\/a> also published last year said its payload was similar to that of LockBit 3.0, so it seems like very little effort was spent on developing a novel strain throughout its lifecycle.<\/p>\n<p>Avast said DoNex was the final rebrand, which took place in March this year and was the most short-lived of the lot, lasting around just a single month.<\/p>\n<p>Again, it targeted victims in locations including Italy, the US, Belgium, Netherlands, and \u2013 a ransomware rarity \u2013 Russia.<\/p>\n<p>The ransom note was almost a verbatim copy of DarkRace&#8217;s, once again suggesting the crims behind it didn&#8217;t pull any muscles in trying to bring something novel to the table \u2013 probably just trying to make a quick buck with as little effort as possible. \u00ae<\/p>\n<p>Updated at 14.53 UTC on July 8, 2024, to add:<\/p>\n<p>Following publication of this article, Avast responded to our questions with a statement. <em>The Reg<\/em>&nbsp;had asked Jakub Kroustek, director of malware research, for more details about the specific flaw that allowed the company to develop a decryptor, but he wouldn&#8217;t divulge any specifics.<\/p>\n<p>Referencing the ChaCha20 symmetric cipher used by DoNex, Kroustek said: &#8220;The discovered crypto flaw in this process that allowed us to decrypt files without the need of paying the ransom.&#8221;<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/36078\/Avast-Secretly-Gave-DoNex-Ransomware-Decryptors-To-Victims.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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":[277],"tags":[9690],"class_list":["post-56504","post","type-post","status-publish","format-standard","hentry","category-cybersecurity-blogs","tag-headlinehackermalwarecybercrimecryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Avast Secretly Gave DoNex Ransomware Decryptors To Victims 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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