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, 17:59

General

  • Target
    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe
  • Size 399KB
  • Sample240905-wk1e4swfkr
  • SHA256 36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1
  • 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\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe
    "C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2752
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xjcveatw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zltqwjpn.exe" C:\Windows\SysWOW64\xjcveatw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1484
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create xjcveatw binPath= "C:\Windows\SysWOW64\xjcveatw\zltqwjpn.exe /d\"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1760
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description xjcveatw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3980
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start xjcveatw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3596
    • 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:628
  • C:\Windows\SysWOW64\xjcveatw\zltqwjpn.exe
    C:\Windows\SysWOW64\xjcveatw\zltqwjpn.exe /d"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3532
    • 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:4232

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        zltqwjpn.exe

        • Path C:\Users\Admin\AppData\Local\Temp\zltqwjpn.exe
        • Size 14.7MB
        • SHA256 84ee083eb321a89d0d0796e823791c6424198912d22866637cfc758294af23fc
        • MD5 SHA1 SHA512 SSDEEP

        memory/2752-2-0x0000000002340000-0x0000000002353000-memory.dmp

        memory/2752-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2752-9-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2752-8-0x0000000002340000-0x0000000002353000-memory.dmp

        memory/2752-7-0x0000000000400000-0x00000000005F8000-memory.dmp

        memory/2752-1-0x0000000000710000-0x0000000000810000-memory.dmp

        memory/3532-12-0x0000000000400000-0x00000000005F8000-memory.dmp

        memory/3532-11-0x0000000000400000-0x00000000005F8000-memory.dmp

        memory/3532-13-0x0000000000400000-0x00000000005F8000-memory.dmp

        memory/3532-18-0x0000000000400000-0x00000000005F8000-memory.dmp

        memory/4232-46-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-39-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-19-0x00000000001B0000-0x00000000001C5000-memory.dmp

        memory/4232-48-0x00000000017D0000-0x00000000017D5000-memory.dmp

        memory/4232-52-0x0000000007000000-0x000000000740B000-memory.dmp

        memory/4232-55-0x0000000007000000-0x000000000740B000-memory.dmp

        memory/4232-56-0x00000000017E0000-0x00000000017E7000-memory.dmp

        memory/4232-51-0x00000000017D0000-0x00000000017D5000-memory.dmp

        memory/4232-47-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-14-0x00000000001B0000-0x00000000001C5000-memory.dmp

        memory/4232-45-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-44-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-42-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-41-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-40-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-17-0x00000000001B0000-0x00000000001C5000-memory.dmp

        memory/4232-38-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-37-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-36-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-35-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-34-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-33-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-32-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-31-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-28-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-25-0x0000000001770000-0x0000000001776000-memory.dmp

        memory/4232-24-0x0000000002000000-0x000000000220F000-memory.dmp

        memory/4232-43-0x0000000001780000-0x0000000001790000-memory.dmp

        memory/4232-21-0x0000000002000000-0x000000000220F000-memory.dmp