Analysis

  • max time kernel
    147s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/05/2024, 08:09

General

  • Target
    3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f.exe
  • Size 11.4MB
  • Sample240529-j2e5aagg92
  • SHA256 3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f
  • 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).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f.exe
    "C:\Users\Admin\AppData\Local\Temp\3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3356
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rfrbtjzl\
      2⤵
        PID:812
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tazmuucg.exe" C:\Windows\SysWOW64\rfrbtjzl\
        2⤵
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rfrbtjzl binPath= "C:\Windows\SysWOW64\rfrbtjzl\tazmuucg.exe /d\"C:\Users\Admin\AppData\Local\Temp\3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rfrbtjzl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rfrbtjzl
          2⤵
          • Launches sc.exe
          PID:2320
        • 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
          PID:3088
      • C:\Windows\SysWOW64\rfrbtjzl\tazmuucg.exe
        C:\Windows\SysWOW64\rfrbtjzl\tazmuucg.exe /d"C:\Users\Admin\AppData\Local\Temp\3f417ded6a57a6a15a5417c7c360ae0089130af33cc1cc0a8d135321860b034f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3280
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4504

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            tazmuucg.exe

            • Path C:\Users\Admin\AppData\Local\Temp\tazmuucg.exe
            • Size 11.7MB
            • SHA256 58e25fdf828442c819ebce10e1731530e81e8de28d891236e15441f9899c20c7
            • MD5 SHA1 SHA512 SSDEEP

            memory/3280-17-0x0000000000400000-0x00000000007B6000-memory.dmp

            memory/3280-12-0x0000000000400000-0x00000000007B6000-memory.dmp

            memory/3280-11-0x0000000000400000-0x00000000007B6000-memory.dmp

            memory/3356-2-0x0000000000800000-0x0000000000813000-memory.dmp

            memory/3356-4-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3356-9-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3356-8-0x0000000000800000-0x0000000000813000-memory.dmp

            memory/3356-7-0x0000000000400000-0x00000000007B6000-memory.dmp

            memory/3356-1-0x0000000000830000-0x0000000000930000-memory.dmp

            memory/4504-46-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-39-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-18-0x00000000008A0000-0x00000000008B5000-memory.dmp

            memory/4504-21-0x0000000002600000-0x000000000280F000-memory.dmp

            memory/4504-55-0x00000000029E0000-0x00000000029E7000-memory.dmp

            memory/4504-51-0x0000000007480000-0x000000000788B000-memory.dmp

            memory/4504-50-0x00000000029D0000-0x00000000029D5000-memory.dmp

            memory/4504-47-0x00000000029D0000-0x00000000029D5000-memory.dmp

            memory/4504-13-0x00000000008A0000-0x00000000008B5000-memory.dmp

            memory/4504-45-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-44-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-43-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-42-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-41-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-40-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-16-0x00000000008A0000-0x00000000008B5000-memory.dmp

            memory/4504-38-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-37-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-36-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-35-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-34-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-33-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-32-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-31-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-30-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-27-0x0000000001D70000-0x0000000001D80000-memory.dmp

            memory/4504-24-0x0000000001D60000-0x0000000001D66000-memory.dmp

            memory/4504-23-0x0000000002600000-0x000000000280F000-memory.dmp

            memory/4504-54-0x0000000007480000-0x000000000788B000-memory.dmp