Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    03/09/2024, 16:53

General

  • Target
    vekvtia.exe
  • Size 10.5MB
  • Sample240903-vefcbasfjb
  • SHA256 21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825
  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\vekvtia.exe
    "C:\Users\Admin\AppData\Local\Temp\vekvtia.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gigptuny\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2424
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qkkcfptf.exe" C:\Windows\SysWOW64\gigptuny\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3916
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gigptuny binPath= "C:\Windows\SysWOW64\gigptuny\qkkcfptf.exe /d\"C:\Users\Admin\AppData\Local\Temp\vekvtia.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4732
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gigptuny "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4560
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gigptuny
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3960
    • 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:1080
  • C:\Windows\SysWOW64\gigptuny\qkkcfptf.exe
    C:\Windows\SysWOW64\gigptuny\qkkcfptf.exe /d"C:\Users\Admin\AppData\Local\Temp\vekvtia.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3608
    • 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:2696

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        qkkcfptf.exe

        • Path C:\Users\Admin\AppData\Local\Temp\qkkcfptf.exe
        • Size 11.6MB
        • SHA256 b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf
        • MD5 SHA1 SHA512 SSDEEP

        memory/860-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

        memory/860-2-0x0000000000750000-0x0000000000763000-memory.dmp

        memory/860-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/860-8-0x0000000000750000-0x0000000000763000-memory.dmp

        memory/860-9-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/860-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/2696-35-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-40-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-53-0x0000000009150000-0x000000000955B000-memory.dmp

        memory/2696-17-0x0000000000E00000-0x0000000000E15000-memory.dmp

        memory/2696-20-0x0000000004B60000-0x0000000004D6F000-memory.dmp

        memory/2696-23-0x0000000000EA0000-0x0000000000EA6000-memory.dmp

        memory/2696-50-0x0000000009150000-0x000000000955B000-memory.dmp

        memory/2696-54-0x0000000000FF0000-0x0000000000FF7000-memory.dmp

        memory/2696-49-0x0000000000EC0000-0x0000000000EC5000-memory.dmp

        memory/2696-46-0x0000000000EC0000-0x0000000000EC5000-memory.dmp

        memory/2696-45-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-44-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-43-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-42-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-41-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-16-0x0000000000E00000-0x0000000000E15000-memory.dmp

        memory/2696-39-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-38-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-37-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-36-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-11-0x0000000000E00000-0x0000000000E15000-memory.dmp

        memory/2696-34-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-33-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-32-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-31-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-30-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-29-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-26-0x0000000000EB0000-0x0000000000EC0000-memory.dmp

        memory/2696-22-0x0000000004B60000-0x0000000004D6F000-memory.dmp

        memory/3608-12-0x0000000000400000-0x00000000005FE000-memory.dmp