Analysis

  • max time kernel
    53s
  • 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
    25/08/2026, 08:51

General

  • Target
    f1bbe1b26b19ee0f7137301e6bbbf18b58809122c1500f99dfc7d8ee5d65e42f.exe
  • Size 9.8MB
  • Sample260825-ksc41agk21
  • SHA256 f1bbe1b26b19ee0f7137301e6bbbf18b58809122c1500f99dfc7d8ee5d65e42f
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Lunam

    Lunam is a Windows trojan written in Visual Basic.

  • Detects Lunam 2 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 7 IoCs
  • Impair Defenses: Safe Mode Boot 1 TTPs 6 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Drops file in System32 directory 10 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 3 IoCs
  • UPX packed file 12 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 17 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 7 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f1bbe1b26b19ee0f7137301e6bbbf18b58809122c1500f99dfc7d8ee5d65e42f.exe
    "C:\Users\Admin\AppData\Local\Temp\f1bbe1b26b19ee0f7137301e6bbbf18b58809122c1500f99dfc7d8ee5d65e42f.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:4284
    • 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:2460
    • C:\Users\Admin\AppData\Local\Temp\avscan.exe
      C:\Users\Admin\AppData\Local\Temp\avscan.exe
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:3460
    • 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:3380
      • C:\windows\hosts.exe
        C:\windows\hosts.exe
        3⤵
        • 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:1312
        • C:\Users\Admin\AppData\Local\Temp\avscan.exe
          C:\Users\Admin\AppData\Local\Temp\avscan.exe
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          PID:2580
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c c:\windows\W_X_C.bat
          4⤵
          • Checks computer location settings
          • Executes a command shell one-liner
          • System Location Discovery: System Language Discovery
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:3684
          • C:\windows\hosts.exe
            C:\windows\hosts.exe
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of SetWindowsHookEx
            PID:4956
          • C:\Windows\SysWOW64\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Windows\W_X_C.vbs"
            5⤵
            • Adds policy Run key to start application
            • Executes a VBScript file via the Windows Script Host.
            • System Location Discovery: System Language Discovery
            PID:2732
        • C:\Windows\SysWOW64\REG.exe
          REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
          4⤵
          • System Location Discovery: System Language Discovery
          • Modifies registry key
          PID:3832
        • C:\Windows\SysWOW64\REG.exe
          REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
          4⤵
          • Modifies registry key
          PID:1772
        • C:\Windows\SysWOW64\REG.exe
          REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
          4⤵
          • Modifies registry key
          PID:548
        • C:\Windows\SysWOW64\REG.exe
          REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
          4⤵
          • Modifies registry key
          PID:2824
      • 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:4744
  • C:\Users\Admin\AppData\Local\Temp\avscan.exe
    C:\Users\Admin\AppData\Local\Temp\avscan.exe
    1⤵
    • 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 System32 directory
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4896
    • C:\Users\Admin\AppData\Local\Temp\avscan.exe
      C:\Users\Admin\AppData\Local\Temp\avscan.exe
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:2216
    • 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:3796
      • C:\windows\hosts.exe
        C:\windows\hosts.exe
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:1428
      • 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:1924
    • C:\Windows\SysWOW64\REG.exe
      REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
      2⤵
      • System Location Discovery: System Language Discovery
      • Modifies registry key
      PID:1388
    • C:\Windows\SysWOW64\REG.exe
      REG DELETE HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
      2⤵
      • Modifies registry key
      PID:4572
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:452

    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 9.8MB
          • SHA256 c9521d69e1528a771fa9431772510f2cb13dfcdf2df4fd05942335f4b4b16d94
          • MD5 SHA1 SHA512 SSDEEP TLSH

          W_X_C.vbs

          • Path C:\Windows\W_X_C.vbs
          • Size 195B
          • SHA256 0dd7b4cc5e69a86346d9226c1c4a6fa09ce91210ca1b04bb28ca3a9fe045a1be
          • MD5 SHA1 SHA512 TLSH

          hosts.exe

          • Path C:\Windows\hosts.exe
          • Size 9.8MB
          • SHA256 27e05324fe4bd64f38dd047d180a42026419762305d8943310f699dde38f9c94
          • 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/1312-47-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/1428-41-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/2216-24-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/2580-40-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/3460-19-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4284-0-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4284-21-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4896-43-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4896-8-0x0000000000400000-0x000000000042E000-memory.dmp

          memory/4956-46-0x0000000000400000-0x000000000042E000-memory.dmp