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
    26/08/2026, 14:27

General

  • Target
    8412c12a4fa4bd00fc2cbd5df47326efb943fb40813fa7cf928236320df82430.exe
  • Size 4.4MB
  • Sample260826-rsxa7seq4t
  • SHA256 8412c12a4fa4bd00fc2cbd5df47326efb943fb40813fa7cf928236320df82430
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Lunam

    Lunam is a Windows trojan written in Visual Basic.

  • Detects Lunam 9 IoCs
  • Modifies visibility of file extensions in Explorer 2 TTPs 3 IoCs
  • Modifies visibility of hidden/system files in Explorer 2 TTPs 3 IoCs
  • Adds policy Run key to start application 2 TTPs 6 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 6 IoCs
  • Impair Defenses: Safe Mode Boot 1 TTPs 6 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 3 IoCs
  • UPX packed file 18 IoCs

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

  • Drops file in Windows directory 5 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.

  • System Location Discovery: System Language Discovery 1 TTPs 22 IoCs

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

  • Modifies registry class 4 IoCs
  • Modifies registry key 1 TTPs 9 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of SetWindowsHookEx 7 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8412c12a4fa4bd00fc2cbd5df47326efb943fb40813fa7cf928236320df82430.exe
    "C:\Users\Admin\AppData\Local\Temp\8412c12a4fa4bd00fc2cbd5df47326efb943fb40813fa7cf928236320df82430.exe"
    1⤵
    • Modifies visibility of file extensions in Explorer
    • Modifies visibility of hidden/system files in Explorer
    • Adds Run key to start application
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4664
    • C:\Windows\SysWOW64\REG.exe
      REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
      2⤵
      • Impair Defenses: Safe Mode Boot
      • System Location Discovery: System Language Discovery
      • Modifies registry key
      PID:1284
    • C:\Users\Admin\AppData\Local\Temp\avscan.exe
      C:\Users\Admin\AppData\Local\Temp\avscan.exe
      2⤵
      • Modifies visibility of file extensions in Explorer
      • Modifies visibility of hidden/system files in Explorer
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4556
      • C:\Users\Admin\AppData\Local\Temp\avscan.exe
        C:\Users\Admin\AppData\Local\Temp\avscan.exe
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:4996
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c c:\windows\W_X_C.bat
        3⤵
        • Checks computer location settings
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        • Suspicious use of WriteProcessMemory
        PID:5068
        • C:\windows\hosts.exe
          C:\windows\hosts.exe
          4⤵
          • Modifies visibility of file extensions in Explorer
          • Modifies visibility of hidden/system files in Explorer
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:4704
          • C:\Users\Admin\AppData\Local\Temp\avscan.exe
            C:\Users\Admin\AppData\Local\Temp\avscan.exe
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of SetWindowsHookEx
            PID:4416
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c c:\windows\W_X_C.bat
            5⤵
            • Checks computer location settings
            • Executes a command shell one-liner
            • System Location Discovery: System Language Discovery
            • Modifies registry class
            • Suspicious use of WriteProcessMemory
            PID:4964
            • C:\windows\hosts.exe
              C:\windows\hosts.exe
              6⤵
              • Executes dropped EXE
              • System Location Discovery: System Language Discovery
              • Suspicious use of SetWindowsHookEx
              PID:3364
            • C:\Windows\SysWOW64\WScript.exe
              "C:\Windows\System32\WScript.exe" "C:\Windows\W_X_C.vbs"
              6⤵
              • Adds policy Run key to start application
              • Executes a VBScript file via the Windows Script Host.
              • System Location Discovery: System Language Discovery
              PID:3500
          • C:\Windows\SysWOW64\REG.exe
            REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:2464
          • C:\Windows\SysWOW64\REG.exe
            REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:1556
          • C:\Windows\SysWOW64\REG.exe
            REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:3684
          • C:\Windows\SysWOW64\REG.exe
            REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:1396
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Windows\W_X_C.vbs"
          4⤵
          • Adds policy Run key to start application
          • Executes a VBScript file via the Windows Script Host.
          • System Location Discovery: System Language Discovery
          PID:2400
      • C:\Windows\SysWOW64\REG.exe
        REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:4568
      • C:\Windows\SysWOW64\REG.exe
        REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:4952
      • C:\Windows\SysWOW64\REG.exe
        REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:4668
      • C:\Windows\SysWOW64\REG.exe
        REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:3776
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c c:\windows\W_X_C.bat
      2⤵
      • Checks computer location settings
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:4252
      • C:\windows\hosts.exe
        C:\windows\hosts.exe
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:3296
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Windows\W_X_C.vbs"
        3⤵
        • Adds policy Run key to start application
        • Executes a VBScript file via the Windows Script Host.
        • System Location Discovery: System Language Discovery
        PID:532
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4024

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          avscan.exe

          • Path C:\Users\Admin\AppData\Local\Temp\avscan.exe
          • Size 4.4MB
          • SHA256 ece5fca1d2b2cf959cb52582773de1a0b4ce4307a381120c153a9d751a6982b0
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 8.8MB
          • SHA256 7f74e050f4dcb2cff44a8d217b44ce7b80863688674905f6d20751a956c72bb6
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 13.2MB
          • SHA256 cee70e338ada92bafadf61759063ee52ce748fbbbe5c7295448ce5e45d6fb320
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 17.6MB
          • SHA256 c340e4daa44240873e7da6c656680ffeebd5c34c1a6db05eb291581161b862ac
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 22.0MB
          • SHA256 590e524d079d20b65b79ea7435b32a534f514d91232bd41147f2175f6cb64912
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 26.4MB
          • SHA256 ae0baaa4eaf823b8b15846879c7ba30205e616852dbddd30baecdd2605b22834
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 30.8MB
          • SHA256 556c14dfee604509f38f8fa4b29392586870974870bd07091bdc87cd364ccb59
          • MD5 SHA1 SHA512 SSDEEP TLSH

          128.png

          • Path C:\Users\Admin\AppData\Local\Temp\scoped_dir800_679877110\CRX_INSTALL\128.png
          • Size 35.2MB
          • SHA256 85be9a46d156a8391c3db81712e83500c30d1f1153fc732aedc9545512d587cf
          • MD5 SHA1 SHA512 SSDEEP TLSH

          W_X_C.vbs

          • Path C:\Windows\W_X_C.vbs
          • Size 195B
          • SHA256 94d9f204b19ccac6031612f6e9d8ae30d903c42e315c9e225642ff619bfcc7c3
          • MD5 SHA1 SHA512 TLSH

          hosts.exe

          • Path C:\Windows\hosts.exe
          • Size 4.4MB
          • SHA256 33f3f9331036a983275587740090209d2cc77114c4efcd3d654f009533e3f723
          • MD5 SHA1 SHA512 SSDEEP TLSH

          W_X_C.bat

          • Path \??\c:\windows\W_X_C.bat
          • Size 336B
          • SHA256 d2150b9e5a4ce55e140f0ca91c4e300715d42095c8fddf58c77037cdd2cfaf78
          • MD5 SHA1 SHA512 TLSH

          memory/3296-37-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/3364-43-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4416-39-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4556-44-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4556-11-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4664-0-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4664-22-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4704-45-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4996-21-0x0000000000400000-0x000000000042E000-memory.dmp