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Malware Analysis
[Video] 3CX SmoothOperator Authenticode Abuse
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<blockquote data-quote="struppigel" data-source="post: 1034248" data-attributes="member: 86910"><p>[MEDIA=youtube]jCXIKHCpvn8[/MEDIA]</p><p></p><p>SmoothOperator abuses Microsoft Authenticode signatures to seem valid. Here is an explanation how it works and how to detect it in files.</p><p></p><p>AnalysePESig: <a href="https://blog.didierstevens.com/programs/authenticode-tools/" target="_blank">Authenticode Tools</a></p><p>SigFlip: <a href="https://github.com/med0x2e/SigFlip" target="_blank">GitHub - med0x2e/SigFlip: SigFlip is a tool for patching authenticode signed PE files (exe, dll, sys ..etc) without invalidating or breaking the existing signature.</a></p><p>Sysinternals: <a href="https://learn.microsoft.com/en-us/sysinternals/downloads/sysinternals-suite" target="_blank">Sysinternals Suite - Sysinternals</a></p><p>Using unauthenticated data inside authenticode signed binaries: <a href="https://web.archive.org/web/20150426192725/http://blogs.msdn.com/b/ieinternals/archive/2014/09/04/personalizing-installers-using-unauthenticated-data-inside-authenticode-signed-binaries.aspx" target="_blank">Caveats for Authenticode Code Signing - IEInternals - Site Home - MSDN Blogs</a></p><p></p><p>00:00 Intro</p><p>00:37 Signature verification</p><p>02:09 SigFlip and SigLoader</p><p>03:05 Ways to hide data in authenticode structures</p><p>06:00 Detecting hidden authenticode data</p><p>08:11 Why this still works</p><p>09:05 Outro</p></blockquote><p></p>
[QUOTE="struppigel, post: 1034248, member: 86910"] [MEDIA=youtube]jCXIKHCpvn8[/MEDIA] SmoothOperator abuses Microsoft Authenticode signatures to seem valid. Here is an explanation how it works and how to detect it in files. AnalysePESig: [URL='https://blog.didierstevens.com/programs/authenticode-tools/']Authenticode Tools[/URL] SigFlip: [URL='https://github.com/med0x2e/SigFlip']GitHub - med0x2e/SigFlip: SigFlip is a tool for patching authenticode signed PE files (exe, dll, sys ..etc) without invalidating or breaking the existing signature.[/URL] Sysinternals: [URL='https://learn.microsoft.com/en-us/sysinternals/downloads/sysinternals-suite']Sysinternals Suite - Sysinternals[/URL] Using unauthenticated data inside authenticode signed binaries: [URL='https://web.archive.org/web/20150426192725/http://blogs.msdn.com/b/ieinternals/archive/2014/09/04/personalizing-installers-using-unauthenticated-data-inside-authenticode-signed-binaries.aspx']Caveats for Authenticode Code Signing - IEInternals - Site Home - MSDN Blogs[/URL] 00:00 Intro 00:37 Signature verification 02:09 SigFlip and SigLoader 03:05 Ways to hide data in authenticode structures 06:00 Detecting hidden authenticode data 08:11 Why this still works 09:05 Outro [/QUOTE]
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