Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    06/09/2024, 07:27

General

  • Target
    938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3.exe
  • Size 213KB
  • Sample240906-jag5katdnl
  • SHA256 938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • vanaheim.cn

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

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

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3.exe
    "C:\Users\Admin\AppData\Local\Temp\938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4956
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ccxkfxg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3640
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe" C:\Windows\SysWOW64\ccxkfxg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3136
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ccxkfxg binPath= "C:\Windows\SysWOW64\ccxkfxg\mygdjwca.exe /d\"C:\Users\Admin\AppData\Local\Temp\938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2156
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ccxkfxg "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4616
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ccxkfxg
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:824
    • C:\Windows\SysWOW64\netsh.exe
      "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
      2⤵
      • Modifies Windows Firewall
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:3572
  • C:\Windows\SysWOW64\ccxkfxg\mygdjwca.exe
    C:\Windows\SysWOW64\ccxkfxg\mygdjwca.exe /d"C:\Users\Admin\AppData\Local\Temp\938bdaad404914635b4acc4510fe1121b28c2131aeaa308783c3588e628347b3.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2684
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3968

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        mygdjwca.exe

        • Path C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe
        • Size 10.7MB
        • SHA256 7e760fdea4c7f58308c413acbed34df60185a17c45fe64a1284dc7a599c44e5a
        • MD5 SHA1 SHA512 SSDEEP

        memory/2684-14-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/3968-46-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-36-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-8-0x0000000000390000-0x00000000003A5000-memory.dmp

        memory/3968-24-0x00000000005F0000-0x00000000005F6000-memory.dmp

        memory/3968-27-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-30-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-20-0x0000000002200000-0x000000000240F000-memory.dmp

        memory/3968-23-0x0000000002200000-0x000000000240F000-memory.dmp

        memory/3968-15-0x0000000000390000-0x00000000003A5000-memory.dmp

        memory/3968-16-0x0000000000390000-0x00000000003A5000-memory.dmp

        memory/3968-39-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-51-0x0000000007240000-0x000000000764B000-memory.dmp

        memory/3968-55-0x00000000027D0000-0x00000000027D7000-memory.dmp

        memory/3968-54-0x0000000007240000-0x000000000764B000-memory.dmp

        memory/3968-50-0x00000000019F0000-0x00000000019F5000-memory.dmp

        memory/3968-47-0x00000000019F0000-0x00000000019F5000-memory.dmp

        memory/3968-45-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-31-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-33-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-43-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-42-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-41-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-40-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-38-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-37-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-32-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-35-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-34-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/3968-44-0x00000000019E0000-0x00000000019F0000-memory.dmp

        memory/4956-1-0x0000000000630000-0x0000000000730000-memory.dmp

        memory/4956-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/4956-2-0x0000000002290000-0x00000000022A3000-memory.dmp

        memory/4956-13-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/4956-11-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/4956-12-0x0000000002290000-0x00000000022A3000-memory.dmp

        memory/4956-10-0x0000000000630000-0x0000000000730000-memory.dmp