Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/09/2024, 01:42

General

  • Target
    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe
  • Size 423KB
  • Sample240905-b46e9asama
  • SHA256 2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2
  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 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\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe
    "C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:368
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wuxlmugk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pyepncu.exe" C:\Windows\SysWOW64\wuxlmugk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1004
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create wuxlmugk binPath= "C:\Windows\SysWOW64\wuxlmugk\pyepncu.exe /d\"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:636
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description wuxlmugk "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3084
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start wuxlmugk
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:220
    • 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:3932
  • C:\Windows\SysWOW64\wuxlmugk\pyepncu.exe
    C:\Windows\SysWOW64\wuxlmugk\pyepncu.exe /d"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4960
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3936

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        pyepncu.exe

        • Path C:\Users\Admin\AppData\Local\Temp\pyepncu.exe
        • Size 14.3MB
        • SHA256 0be1e96f5e5b732c588430dae05ab4236053120393d462594908bd4924d1ae9c
        • MD5 SHA1 SHA512 SSDEEP

        memory/368-1-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/368-2-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/368-4-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/368-8-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/3936-45-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-40-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-24-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

        memory/3936-13-0x0000000000C30000-0x0000000000C45000-memory.dmp

        memory/3936-16-0x0000000000C30000-0x0000000000C45000-memory.dmp

        memory/3936-27-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-18-0x0000000000C30000-0x0000000000C45000-memory.dmp

        memory/3936-54-0x0000000007800000-0x0000000007C0B000-memory.dmp

        memory/3936-55-0x0000000002DF0000-0x0000000002DF7000-memory.dmp

        memory/3936-51-0x0000000007800000-0x0000000007C0B000-memory.dmp

        memory/3936-50-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        memory/3936-47-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        memory/3936-46-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-30-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-44-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-43-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-42-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

        memory/3936-39-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-38-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-37-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-36-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-35-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-34-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-33-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-32-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-31-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/3936-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

        memory/3936-41-0x0000000002B10000-0x0000000002B20000-memory.dmp

        memory/4960-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4960-10-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4960-17-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4960-11-0x0000000000400000-0x00000000005FE000-memory.dmp