Analysis

  • max time kernel
    114s
  • max time network
    117s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/08/2024, 14:58

General

  • Target
    f16fc2ac7e1e693ecf08ed05fe889bc0N.exe
  • Size 71KB
  • Sample240804-scc33ascrf
  • SHA256 625afc0a5a909014f9fab052f5eae642a6677d2e1f60b7593aaedabdf6864aec
  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe
    "C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3892
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lltlzoey\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pslwwfgg.exe" C:\Windows\SysWOW64\lltlzoey\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2776
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create lltlzoey binPath= "C:\Windows\SysWOW64\lltlzoey\pslwwfgg.exe /d\"C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4184
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description lltlzoey "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:312
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start lltlzoey
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3076
    • 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:2360
  • C:\Windows\SysWOW64\lltlzoey\pslwwfgg.exe
    C:\Windows\SysWOW64\lltlzoey\pslwwfgg.exe /d"C:\Users\Admin\AppData\Local\Temp\f16fc2ac7e1e693ecf08ed05fe889bc0N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1128
    • 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:3444

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        pslwwfgg.exe

        • Path C:\Users\Admin\AppData\Local\Temp\pslwwfgg.exe
        • Size 10.2MB
        • SHA256 a77dfda6fe7352ea59ba11fddea0ae6ab887d4dfc6e178f0d57519bf29e05bde
        • MD5 SHA1 SHA512 SSDEEP

        memory/3444-3-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        memory/3444-6-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        memory/3444-7-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        memory/3444-8-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        memory/3444-30-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-45-0x00000000025E0000-0x00000000025E7000-memory.dmp

        memory/3444-41-0x0000000007D80000-0x000000000818B000-memory.dmp

        memory/3444-40-0x00000000025D0000-0x00000000025D5000-memory.dmp

        memory/3444-37-0x00000000025D0000-0x00000000025D5000-memory.dmp

        memory/3444-36-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-35-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-34-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-33-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-32-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-31-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-29-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-44-0x0000000007D80000-0x000000000818B000-memory.dmp

        memory/3444-28-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-27-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-26-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-25-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-24-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-23-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-22-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-21-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-20-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-17-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/3444-14-0x0000000002530000-0x0000000002536000-memory.dmp

        memory/3444-13-0x0000000002E00000-0x000000000300F000-memory.dmp

        memory/3444-11-0x0000000002E00000-0x000000000300F000-memory.dmp

        memory/3444-49-0x0000000000F90000-0x0000000000FA5000-memory.dmp