Resubmissions

13/09/2024, 08:50

240913-krlpravbkn10

12/09/2024, 22:11

240912-14fl9syckf10

Analysis

  • max time kernel
    148s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    13/09/2024, 08:50

General

  • Target
    0fcd127ebda0d435dda364e977a26120N.exe
  • Size 239KB
  • Sample240913-krlpravbkn
  • SHA256 63296be0fc8cedc36f814d05171e0cddf9186afa45ead6ec8632b7cbe4b06ccc
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe
    "C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2328
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mmuenbig\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:532
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zlbocbtx.exe" C:\Windows\SysWOW64\mmuenbig\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1464
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create mmuenbig binPath= "C:\Windows\SysWOW64\mmuenbig\zlbocbtx.exe /d\"C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:804
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description mmuenbig "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2200
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start mmuenbig
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2816
    • 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:2984
  • C:\Windows\SysWOW64\mmuenbig\zlbocbtx.exe
    C:\Windows\SysWOW64\mmuenbig\zlbocbtx.exe /d"C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2780
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:2864

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        zlbocbtx.exe

        • Path C:\Users\Admin\AppData\Local\Temp\zlbocbtx.exe
        • Size 14.2MB
        • SHA256 99c76236ea4152107a0955b6192cc280b8e86f44d4f4e4515ef050fbfd95126f
        • MD5 SHA1 SHA512 SSDEEP

        memory/2328-8-0x0000000000400000-0x0000000002B5C000-memory.dmp

        memory/2328-2-0x00000000002A0000-0x00000000002B3000-memory.dmp

        memory/2328-4-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2328-1-0x0000000002BD0000-0x0000000002CD0000-memory.dmp

        memory/2328-10-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2328-9-0x00000000002A0000-0x00000000002B3000-memory.dmp

        memory/2780-17-0x0000000000400000-0x0000000002B5C000-memory.dmp

        memory/2864-30-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-40-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2864-11-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2864-18-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2864-23-0x0000000001960000-0x0000000001B6F000-memory.dmp

        memory/2864-24-0x00000000000A0000-0x00000000000A6000-memory.dmp

        memory/2864-20-0x0000000001960000-0x0000000001B6F000-memory.dmp

        memory/2864-27-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-32-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-16-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2864-42-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-31-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-34-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-41-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-14-0x0000000000080000-0x0000000000095000-memory.dmp

        memory/2864-39-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-38-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-44-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-50-0x00000000000C0000-0x00000000000C5000-memory.dmp

        memory/2864-51-0x00000000055A0000-0x00000000059AB000-memory.dmp

        memory/2864-55-0x00000000001D0000-0x00000000001D7000-memory.dmp

        memory/2864-47-0x00000000000C0000-0x00000000000C5000-memory.dmp

        memory/2864-46-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-45-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-43-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-54-0x00000000055A0000-0x00000000059AB000-memory.dmp

        memory/2864-37-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-36-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-35-0x00000000000B0000-0x00000000000C0000-memory.dmp

        memory/2864-33-0x00000000000B0000-0x00000000000C0000-memory.dmp