Analysis

  • max time kernel
    63s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/01/2024, 03:23

General

  • Target
    9f72ad79bba9d398a150be4b676c624b.exe
  • Size 233KB
  • Sample240115-dxwnkshde3
  • SHA256 c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981
  • 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) 1 TTPs
  • Modifies Windows Firewall 1 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 2 IoCs
  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9f72ad79bba9d398a150be4b676c624b.exe
    "C:\Users\Admin\AppData\Local\Temp\9f72ad79bba9d398a150be4b676c624b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3300
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jynkbspd\
      2⤵
        PID:668
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tadyxrrl.exe" C:\Windows\SysWOW64\jynkbspd\
        2⤵
          PID:4228
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jynkbspd binPath= "C:\Windows\SysWOW64\jynkbspd\tadyxrrl.exe /d\"C:\Users\Admin\AppData\Local\Temp\9f72ad79bba9d398a150be4b676c624b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jynkbspd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jynkbspd
          2⤵
          • Launches sc.exe
          PID:852
        • 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:4628
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3300 -s 684
          2⤵
          • Program crash
          PID:2508
      • C:\Windows\SysWOW64\jynkbspd\tadyxrrl.exe
        C:\Windows\SysWOW64\jynkbspd\tadyxrrl.exe /d"C:\Users\Admin\AppData\Local\Temp\9f72ad79bba9d398a150be4b676c624b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2356
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2356 -s 516
          2⤵
          • Program crash
          PID:4284
        • 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:4088
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3300 -ip 3300
        1⤵
          PID:1328
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 196 -p 2356 -ip 2356
          1⤵
            PID:4304

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                tadyxrrl.exe

                • Path C:\Users\Admin\AppData\Local\Temp\tadyxrrl.exe
                • Size 643KB
                • SHA256 7f91c7796f24f26c8fb7cb792c016fb99feeacf5bb2397aaba96ed48e8ce8fc4
                • MD5 SHA1 SHA512 SSDEEP

                tadyxrrl.exe

                • Path C:\Windows\SysWOW64\jynkbspd\tadyxrrl.exe
                • Size 570KB
                • SHA256 67bdc585149beea5e735d4e634218cf66e211e184228f00f2493642633500280
                • MD5 SHA1 SHA512 SSDEEP

                memory/2356-14-0x0000000000680000-0x0000000000780000-memory.dmp

                memory/2356-11-0x0000000000400000-0x000000000043F000-memory.dmp

                memory/3300-4-0x0000000000400000-0x000000000043F000-memory.dmp

                memory/3300-1-0x0000000000570000-0x0000000000670000-memory.dmp

                memory/3300-8-0x00000000004E0000-0x00000000004F3000-memory.dmp

                memory/3300-7-0x0000000000400000-0x000000000043F000-memory.dmp

                memory/3300-2-0x00000000004E0000-0x00000000004F3000-memory.dmp

                memory/4088-46-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-42-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-16-0x00000000006E0000-0x00000000006F5000-memory.dmp

                memory/4088-15-0x00000000006E0000-0x00000000006F5000-memory.dmp

                memory/4088-20-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/4088-27-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-51-0x0000000007940000-0x0000000007D4B000-memory.dmp

                memory/4088-54-0x0000000007940000-0x0000000007D4B000-memory.dmp

                memory/4088-55-0x0000000001BF0000-0x0000000001BF7000-memory.dmp

                memory/4088-50-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

                memory/4088-47-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

                memory/4088-10-0x00000000006E0000-0x00000000006F5000-memory.dmp

                memory/4088-45-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-44-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-43-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-17-0x00000000006E0000-0x00000000006F5000-memory.dmp

                memory/4088-41-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-40-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-39-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-38-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-37-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-36-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-35-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-34-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-33-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-32-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-31-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-30-0x0000000001BB0000-0x0000000001BC0000-memory.dmp

                memory/4088-24-0x0000000001BA0000-0x0000000001BA6000-memory.dmp

                memory/4088-23-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/4088-59-0x00000000006E0000-0x00000000006F5000-memory.dmp