Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/05/2024, 09:24

General

  • Target
    914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1.exe
  • Size 11.5MB
  • Sample240522-lc2yvsae47
  • SHA256 914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1
  • 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).

  • Program crash 3 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1.exe
    "C:\Users\Admin\AppData\Local\Temp\914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tmdimmsq\
      2⤵
        PID:1120
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fdnoqmpv.exe" C:\Windows\SysWOW64\tmdimmsq\
        2⤵
          PID:3252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tmdimmsq binPath= "C:\Windows\SysWOW64\tmdimmsq\fdnoqmpv.exe /d\"C:\Users\Admin\AppData\Local\Temp\914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2020
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tmdimmsq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tmdimmsq
          2⤵
          • Launches sc.exe
          PID:3816
        • 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:4068
      • C:\Windows\SysWOW64\tmdimmsq\fdnoqmpv.exe
        C:\Windows\SysWOW64\tmdimmsq\fdnoqmpv.exe /d"C:\Users\Admin\AppData\Local\Temp\914f74e19d0a6b1501f2942ddd8eb78ed51ffd25da203c779ee05591dbb9b0b1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2224
        • 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:1856
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2224 -s 660
          2⤵
          • Program crash
          PID:2868
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2224 -s 712
          2⤵
          • Program crash
          PID:2476
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2224 -s 720
          2⤵
          • Program crash
          PID:4936
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2224 -ip 2224
        1⤵
          PID:540
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2224 -ip 2224
          1⤵
            PID:2012
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 2224 -ip 2224
            1⤵
              PID:1692

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  fdnoqmpv.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\fdnoqmpv.exe
                  • Size 12.0MB
                  • SHA256 7490667402a3864b52bf399e609af8b640f42a82ee678789d405d06bd86640eb
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/860-1-0x0000000002760000-0x0000000002860000-memory.dmp

                  memory/860-2-0x00000000026F0000-0x0000000002703000-memory.dmp

                  memory/860-4-0x0000000000400000-0x0000000000415000-memory.dmp

                  memory/860-7-0x0000000000400000-0x000000000246F000-memory.dmp

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

                  memory/860-8-0x00000000026F0000-0x0000000002703000-memory.dmp

                  memory/1856-39-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-35-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-14-0x0000000001010000-0x0000000001025000-memory.dmp

                  memory/1856-21-0x00000000023C0000-0x00000000023C6000-memory.dmp

                  memory/1856-43-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-52-0x00000000023F0000-0x00000000023F7000-memory.dmp

                  memory/1856-48-0x0000000007C00000-0x000000000800B000-memory.dmp

                  memory/1856-47-0x00000000023E0000-0x00000000023E5000-memory.dmp

                  memory/1856-44-0x00000000023E0000-0x00000000023E5000-memory.dmp

                  memory/1856-42-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-40-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-11-0x0000000001010000-0x0000000001025000-memory.dmp

                  memory/1856-38-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-37-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-36-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-13-0x0000000001010000-0x0000000001025000-memory.dmp

                  memory/1856-34-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-33-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-32-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-31-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-30-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-29-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-28-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                  memory/1856-51-0x0000000007C00000-0x000000000800B000-memory.dmp

                  memory/1856-41-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-27-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/1856-18-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                  memory/1856-24-0x00000000023D0000-0x00000000023E0000-memory.dmp

                  memory/2224-15-0x0000000000400000-0x000000000246F000-memory.dmp