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Malware Analysis
[Video] Analysis of 3CX SmoothOperator ffmpeg.dll with Binary Ninja
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<blockquote data-quote="struppigel" data-source="post: 1033871" data-attributes="member: 86910"><p>We analyze the trojanized ffmpeg.dll that was used in the supply chain attack called SmoothOperator. Me mark up the decompiled code in Binary Ninja and decrypt the next stage.</p><p></p><p>[MEDIA=youtube]fTX-vgSEfjk[/MEDIA]</p><p></p><p><strong>Tools:</strong></p><p>Binary Ninja: <a href="https://binary.ninja/" target="_blank">Binary Ninja</a></p><p>PortexAnalyzerGUI: <a href="https://github.com/struppigel/PortexAnalyzerGUI/releases/tag/0.12.9" target="_blank">Release PortexAnalyzer GUI v 0.12.9 · struppigel/PortexAnalyzerGUI</a></p><p>Sysinternals: <a href="https://learn.microsoft.com/en-us/sysinternals/downloads/strings" target="_blank">Strings - Sysinternals</a></p><p></p><p><strong>Samples:</strong></p><p>ffmpeg: <a href="https://bazaar.abuse.ch/sample/7986bbaee8940da11ce089383521ab420c443ab7b15ed42aed91fd31ce833896" target="_blank">MalwareBazaar | Browse Checking your browser</a></p><p>d3dcompiler_47.dll: <a href="https://bazaar.abuse.ch/sample/11be1803e2e307b647a8a7e02d128335c448ff741bf06bf52b332e0bbf423b03" target="_blank">MalwareBazaar | Browse Checking your browser</a></p><p></p><p>00:00 Intro</p><p>00:36 Bleepingcomputer article</p><p>03:03 3CXDesktopApp.msi unpacking</p><p>03:50 Finding the malicious code</p><p>09:00 Marking up the code in Binary Ninja</p><p>19:24 Certificate parser markup</p><p>30:51 Decryption function</p><p>33:31 Unpacking code from d3dcompiler_47.dll</p><p>36:45 Outro</p></blockquote><p></p>
[QUOTE="struppigel, post: 1033871, member: 86910"] We analyze the trojanized ffmpeg.dll that was used in the supply chain attack called SmoothOperator. Me mark up the decompiled code in Binary Ninja and decrypt the next stage. [MEDIA=youtube]fTX-vgSEfjk[/MEDIA] [B]Tools:[/B] Binary Ninja: [URL="https://binary.ninja/"]Binary Ninja[/URL] PortexAnalyzerGUI: [URL="https://github.com/struppigel/PortexAnalyzerGUI/releases/tag/0.12.9"]Release PortexAnalyzer GUI v 0.12.9 · struppigel/PortexAnalyzerGUI[/URL] Sysinternals: [URL="https://learn.microsoft.com/en-us/sysinternals/downloads/strings"]Strings - Sysinternals[/URL] [B]Samples:[/B] ffmpeg: [URL="https://bazaar.abuse.ch/sample/7986bbaee8940da11ce089383521ab420c443ab7b15ed42aed91fd31ce833896"]MalwareBazaar | Browse Checking your browser[/URL] d3dcompiler_47.dll: [URL="https://bazaar.abuse.ch/sample/11be1803e2e307b647a8a7e02d128335c448ff741bf06bf52b332e0bbf423b03"]MalwareBazaar | Browse Checking your browser[/URL] 00:00 Intro 00:36 Bleepingcomputer article 03:03 3CXDesktopApp.msi unpacking 03:50 Finding the malicious code 09:00 Marking up the code in Binary Ninja 19:24 Certificate parser markup 30:51 Decryption function 33:31 Unpacking code from d3dcompiler_47.dll 36:45 Outro [/QUOTE]
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