Analysis

  • max time kernel
    150s
  • max time network
    123s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260706-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260706-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    08/07/2026, 21:33

General

  • Target
    Sewi.exe
  • Size 4.6MB
  • Sample260708-1ect3sat8y
  • SHA256 345ab938bcc8491cf079c29cd129e36467f6fa71817245caf3052265899f91c4
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Modifies visibility of hidden/system files in Explorer 2 TTPs 2 IoCs
  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 6 IoCs
  • Sets service image path in registry 3 TTPs 1 IoCs

    This determines the executable launched when a service starts. It can be used to establish persistence.

  • Checks BIOS information in registry 2 TTPs 12 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Executes dropped EXE 7 IoCs
  • Themida packer 19 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Adds Run key to start application 2 TTPs 4 IoCs
  • Checks whether UAC is enabled 1 TTPs 6 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs
  • Drops file in Windows directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 12 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Sewi.exe
    "C:\Users\Admin\AppData\Local\Temp\Sewi.exe"
    1⤵
    • Identifies VirtualBox via ACPI registry values (likely anti-VM)
    • Checks BIOS information in registry
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3496
    • \??\c:\users\admin\appdata\local\temp\sewi.exe 
      c:\users\admin\appdata\local\temp\sewi.exe 
      2⤵
      • Executes dropped EXE
      • Drops file in Windows directory
      • Suspicious use of WriteProcessMemory
      PID:5224
      • C:\Windows\SoftwareDistribution\Download\sDQ0X.exe
        "C:\Windows\SoftwareDistribution\Download\sDQ0X.exe" -map C:\Windows\SoftwareDistribution\Download\hOogK.sys
        3⤵
        • Sets service image path in registry
        • Executes dropped EXE
        • Suspicious behavior: LoadsDriver
        • Suspicious use of AdjustPrivilegeToken
        PID:2544
    • C:\Windows\Resources\Themes\icsys.icn.exe
      C:\Windows\Resources\Themes\icsys.icn.exe
      2⤵
      • Identifies VirtualBox via ACPI registry values (likely anti-VM)
      • Checks BIOS information in registry
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:5872
      • \??\c:\windows\resources\themes\explorer.exe
        c:\windows\resources\themes\explorer.exe
        3⤵
        • Modifies visibility of hidden/system files in Explorer
        • Identifies VirtualBox via ACPI registry values (likely anti-VM)
        • Checks BIOS information in registry
        • Executes dropped EXE
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • Drops file in System32 directory
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Drops file in Windows directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1228
        • \??\c:\windows\resources\spoolsv.exe
          c:\windows\resources\spoolsv.exe SE
          4⤵
          • Identifies VirtualBox via ACPI registry values (likely anti-VM)
          • Checks BIOS information in registry
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious use of NtSetInformationThreadHideFromDebugger
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2708
          • \??\c:\windows\resources\svchost.exe
            c:\windows\resources\svchost.exe
            5⤵
            • Modifies visibility of hidden/system files in Explorer
            • Identifies VirtualBox via ACPI registry values (likely anti-VM)
            • Checks BIOS information in registry
            • Executes dropped EXE
            • Adds Run key to start application
            • Checks whether UAC is enabled
            • Drops file in System32 directory
            • Suspicious use of NtSetInformationThreadHideFromDebugger
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:5600
            • \??\c:\windows\resources\spoolsv.exe
              c:\windows\resources\spoolsv.exe PR
              6⤵
              • Identifies VirtualBox via ACPI registry values (likely anti-VM)
              • Checks BIOS information in registry
              • Executes dropped EXE
              • Checks whether UAC is enabled
              • Suspicious use of NtSetInformationThreadHideFromDebugger
              • System Location Discovery: System Language Discovery
              • Suspicious use of SetWindowsHookEx
              PID:4492

Network

        MITRE ATT&CK Enterprise v16

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        Downloads

        sewi.exe 

        • Path C:\Users\Admin\AppData\Local\Temp\sewi.exe 
        • Size 2.1MB
        • SHA256 29bdf43af7fce4a48a4699f01ba35a9d23ec72109f9a8d59b84788610066b715
        • MD5 SHA1 SHA512 SSDEEP TLSH

        explorer.exe

        • Path C:\Windows\Resources\Themes\explorer.exe
        • Size 2.5MB
        • SHA256 bb9e414b8229045c56c1795e7bb5fe6d51599d8b4843dc94d23571674a46f367
        • MD5 SHA1 SHA512 SSDEEP TLSH

        icsys.icn.exe

        • Path C:\Windows\Resources\Themes\icsys.icn.exe
        • Size 2.5MB
        • SHA256 23b0f28e5f104e80a09ba53ab23606925496c1da489ac6f478b4e0e2fa6fc5e0
        • MD5 SHA1 SHA512 SSDEEP TLSH

        spoolsv.exe

        • Path C:\Windows\Resources\spoolsv.exe
        • Size 2.5MB
        • SHA256 72bc2f08447bbf52944bc26f5d64e49e438e2734bd42735c6cb375b91a9765c9
        • MD5 SHA1 SHA512 SSDEEP TLSH

        svchost.exe

        • Path C:\Windows\Resources\svchost.exe
        • Size 2.5MB
        • SHA256 a1244fc0ccaed1c9f7565e4833f72061ce940adfb69a55ac5944ad521ea464cc
        • MD5 SHA1 SHA512 SSDEEP TLSH

        sDQ0X.exe

        • Path C:\Windows\SoftwareDistribution\Download\sDQ0X.exe
        • Size 260KB
        • SHA256 03aefd40698cafbd48138784f362fb9a36f726fb50f262ca40695729f7b553ca
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/1228-32-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/1228-79-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/1228-93-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/1228-81-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/1228-67-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/2708-43-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/2708-65-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/3496-0-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/3496-66-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/4492-62-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/5600-70-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/5600-69-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/5600-53-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/5600-94-0x0000000000400000-0x0000000000A0E000-memory.dmp

        memory/5872-64-0x0000000000400000-0x0000000000A0E000-memory.dmp