Analysis

  • max time kernel
    145s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    14-12-2020 14:25

General

  • Target

    433b76b50aff2852f8e7a5071594df71.exe

  • Size

    14.7MB

  • MD5

    433b76b50aff2852f8e7a5071594df71

  • SHA1

    d721a6ffb0c601d9b7209ce0cf0334d9a70b4810

  • SHA256

    289638ff4cfd284afe4780faa40c63f0c484de2eaabe35f006cbfa7f538fe891

  • SHA512

    4b99fa41f4e937f109e9b3564146c12ed63bda8e354c2078a0c5d56af9afb611673a586995fb942efe3514c9c278c972c3610488e12410816e894127fcf08f7a

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
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\433b76b50aff2852f8e7a5071594df71.exe
    "C:\Users\Admin\AppData\Local\Temp\433b76b50aff2852f8e7a5071594df71.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1696
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rfbgoqrm\
      2⤵
        PID:1708
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\clfkcbws.exe" C:\Windows\SysWOW64\rfbgoqrm\
        2⤵
          PID:1108
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rfbgoqrm binPath= "C:\Windows\SysWOW64\rfbgoqrm\clfkcbws.exe /d\"C:\Users\Admin\AppData\Local\Temp\433b76b50aff2852f8e7a5071594df71.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:1356
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description rfbgoqrm "wifi internet conection"
            2⤵
              PID:1296
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start rfbgoqrm
              2⤵
                PID:268
              • 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:1016
              • C:\Windows\SysWOW64\rfbgoqrm\clfkcbws.exe
                C:\Windows\SysWOW64\rfbgoqrm\clfkcbws.exe /d"C:\Users\Admin\AppData\Local\Temp\433b76b50aff2852f8e7a5071594df71.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:1680
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  PID:964

              Network

              MITRE ATT&CK Matrix ATT&CK v6

              Persistence

              New Service

              1
              T1050

              Modify Existing Service

              1
              T1031

              Registry Run Keys / Startup Folder

              1
              T1060

              Privilege Escalation

              New Service

              1
              T1050

              Defense Evasion

              Disabling Security Tools

              1
              T1089

              Modify Registry

              2
              T1112

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • C:\Users\Admin\AppData\Local\Temp\clfkcbws.exe
                MD5

                1ee4bd25aa7ded44aa9ca57bc69d0c50

                SHA1

                ce93ea9461fecf270448ca8ed09b16dbd8cd4842

                SHA256

                8ceaabcc4c809286e3a4ec8d1832ec8876764f31a9362c943548a750e225dacd

                SHA512

                9c152f916585730fea89d3c529ad8910a99cf6c4d22b0db1b4de11d75482cf2cd18f1334c1337bd901bb786a4cc7f9e0c9565c67d2cc257d27045699e22bad15

              • C:\Windows\SysWOW64\rfbgoqrm\clfkcbws.exe
                MD5

                1ee4bd25aa7ded44aa9ca57bc69d0c50

                SHA1

                ce93ea9461fecf270448ca8ed09b16dbd8cd4842

                SHA256

                8ceaabcc4c809286e3a4ec8d1832ec8876764f31a9362c943548a750e225dacd

                SHA512

                9c152f916585730fea89d3c529ad8910a99cf6c4d22b0db1b4de11d75482cf2cd18f1334c1337bd901bb786a4cc7f9e0c9565c67d2cc257d27045699e22bad15

              • memory/268-9-0x0000000000000000-mapping.dmp
              • memory/964-16-0x00000000000C0000-0x00000000000D5000-memory.dmp
                Filesize

                84KB

              • memory/964-14-0x00000000000C0000-0x00000000000D5000-memory.dmp
                Filesize

                84KB

              • memory/964-15-0x00000000000C9A6B-mapping.dmp
              • memory/1016-11-0x0000000000000000-mapping.dmp
              • memory/1108-5-0x0000000000000000-mapping.dmp
              • memory/1296-8-0x0000000000000000-mapping.dmp
              • memory/1356-7-0x0000000000000000-mapping.dmp
              • memory/1680-12-0x0000000000E19000-0x0000000000E1A000-memory.dmp
                Filesize

                4KB

              • memory/1680-13-0x0000000001170000-0x0000000001181000-memory.dmp
                Filesize

                68KB

              • memory/1696-2-0x00000000002D7000-0x00000000002D8000-memory.dmp
                Filesize

                4KB

              • memory/1696-3-0x00000000025A0000-0x00000000025B1000-memory.dmp
                Filesize

                68KB

              • memory/1708-4-0x0000000000000000-mapping.dmp