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Video Reviews - Security and Privacy
JS/Cerber.S!Eldorado Ransomware
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<blockquote data-quote="hjlbx" data-source="post: 544703"><p><span style="font-size: 15px"><strong>From Malwarebytes Blog</strong></span></p><p><span style="font-size: 15px"></span></p><p><span style="font-size: 15px"><strong>CERBER UAC Bypass</strong></span></p><p>Cerber uses tricks to bypass Windows <a href="http://blog.cobaltstrike.com/2014/03/20/user-account-control-what-penetration-testers-should-know/" target="_blank">User Account Controll (UAC)</a> and deploy itself with elevated privileges. It is achieved by the following steps:</p><ol> <li data-xf-list-type="ol">Search an executable in C:\Windows\system32, that can auto elevate it’s privileges.</li> <li data-xf-list-type="ol">Search in it’s import table a DLL that can be hijacked</li> <li data-xf-list-type="ol">Copy the DLL into %TEMP% folder and patch it – add a code in a new section and patch entry point in order to redirect execution there. It will be used in order to run the cerber sample with elevated privileges. It uses: <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/ms687393%28v=vs.85%29.aspx" target="_blank">WinExec</a>(“[cerber_path] <strong>-eval 2524</strong>“, SW_SHOWNORMAL)</li> <li data-xf-list-type="ol">Inject the code into explorer.exe – it is responsible for executing the UAC bypass. Creates a new folder in C:\Windows\system32 and copy there both files – an EXE and the patched DLL – under original names, then it deploys the EXE causing DLL to load and execute the malicious code.</li> <li data-xf-list-type="ol">When the UAC bypass is executed successfully, it is signalized to the original cerber sample by setting a property <strong>cerber_uac_status</strong> – added to a Shell_TrayWnd. Then, the original sample deletes dropped files and exits. Otherwise, it tries the same trick with different pair of EXE + DLL.</li> </ol><p><em><strong>NOTE (Mine): User Space processes should not be permitted to copy any files in System Space and paste them to User Space. This copying of System Space objects and pasting them to User Space is used by malware types other than Cerber.</strong></em></p><p>* * * * *</p><p></p><p>If you want further details see here: <a href="https://blog.malwarebytes.com/threat-analysis/2016/03/cerber-ransomware-new-but-mature/" target="_blank">Cerber Ransomware – New, But Mature</a></p></blockquote><p></p>
[QUOTE="hjlbx, post: 544703"] [SIZE=4][B]From Malwarebytes Blog[/B] [B]CERBER UAC Bypass[/B][/SIZE] Cerber uses tricks to bypass Windows [URL='http://blog.cobaltstrike.com/2014/03/20/user-account-control-what-penetration-testers-should-know/']User Account Controll (UAC)[/URL] and deploy itself with elevated privileges. It is achieved by the following steps: [LIST=1] [*]Search an executable in C:\Windows\system32, that can auto elevate it’s privileges. [*]Search in it’s import table a DLL that can be hijacked [*]Copy the DLL into %TEMP% folder and patch it – add a code in a new section and patch entry point in order to redirect execution there. It will be used in order to run the cerber sample with elevated privileges. It uses: [URL='https://msdn.microsoft.com/en-us/library/windows/desktop/ms687393%28v=vs.85%29.aspx']WinExec[/URL](“[cerber_path] [B]-eval 2524[/B]“, SW_SHOWNORMAL) [*]Inject the code into explorer.exe – it is responsible for executing the UAC bypass. Creates a new folder in C:\Windows\system32 and copy there both files – an EXE and the patched DLL – under original names, then it deploys the EXE causing DLL to load and execute the malicious code. [*]When the UAC bypass is executed successfully, it is signalized to the original cerber sample by setting a property [B]cerber_uac_status[/B] – added to a Shell_TrayWnd. Then, the original sample deletes dropped files and exits. Otherwise, it tries the same trick with different pair of EXE + DLL. [/LIST] [I][B]NOTE (Mine): User Space processes should not be permitted to copy any files in System Space and paste them to User Space. This copying of System Space objects and pasting them to User Space is used by malware types other than Cerber.[/B][/I] * * * * * If you want further details see here: [URL='https://blog.malwarebytes.com/threat-analysis/2016/03/cerber-ransomware-new-but-mature/']Cerber Ransomware – New, But Mature[/URL] [/QUOTE]
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