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Analysis

  • max time kernel
    148s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/10/2023, 02:12

General

  • Target

    file.exe

  • Size

    298KB

  • MD5

    5182e126b6f798ddb20ac56c5ab4660d

  • SHA1

    467a4e7708679aac87c2a4e98b9c69eba12dc21b

  • SHA256

    d7b88f392653a4569f1f6a792d27ed75dcb22921915ff2cff23519d6eb8c673a

  • SHA512

    37b25dc5c340817881922fc7b9fa4a06e1954cae86afee74d174c905e7be366edfe9329888bbcd46d3c8bae1d295c7dd13e0b78bc408d341b5d5d42c7301d4b8

  • SSDEEP

    3072:w+uHkj3i/Gur0Z6sZgrKBRTM+4FvH9vxrFUkcVTcgpWvKV/Fy2L3:4Hci/GuoZ6pmBSJrJpUpV4gEY4

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

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

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mjcjdcvb\
      2⤵
        PID:4360
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ztywrurt.exe" C:\Windows\SysWOW64\mjcjdcvb\
        2⤵
          PID:460
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mjcjdcvb binPath= "C:\Windows\SysWOW64\mjcjdcvb\ztywrurt.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mjcjdcvb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2424
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mjcjdcvb
          2⤵
          • Launches sc.exe
          PID:436
        • 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⤵
          • Modifies Windows Firewall
          PID:408
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1684 -s 1208
          2⤵
          • Program crash
          PID:4176
      • C:\Windows\SysWOW64\mjcjdcvb\ztywrurt.exe
        C:\Windows\SysWOW64\mjcjdcvb\ztywrurt.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2920
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2920 -s 536
          2⤵
          • Program crash
          PID:3700
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 1684 -ip 1684
        1⤵
          PID:3424
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 2920 -ip 2920
          1⤵
            PID:1496

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\ztywrurt.exe

            Filesize

            10.2MB

            MD5

            a9b2e594e56680bcde8c5aef9d4415f7

            SHA1

            5dd58e3f6f125db51638052a545babcadf7e4ee0

            SHA256

            839b2201cd30630f51d63b82855c50b8bbf22c8a9b720c43b78609fac76c96fd

            SHA512

            5edccf2db91b23ebe837868dff1ecf588fd81cbc15226f70c82aeaf6c3958a2b5b2ae90b5d3d416440c4a4abc3e0ef39d96f840c80c42cf99629cdb96c390a77

          • C:\Windows\SysWOW64\mjcjdcvb\ztywrurt.exe

            Filesize

            10.2MB

            MD5

            a9b2e594e56680bcde8c5aef9d4415f7

            SHA1

            5dd58e3f6f125db51638052a545babcadf7e4ee0

            SHA256

            839b2201cd30630f51d63b82855c50b8bbf22c8a9b720c43b78609fac76c96fd

            SHA512

            5edccf2db91b23ebe837868dff1ecf588fd81cbc15226f70c82aeaf6c3958a2b5b2ae90b5d3d416440c4a4abc3e0ef39d96f840c80c42cf99629cdb96c390a77

          • memory/1316-43-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-34-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-56-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

            Filesize

            28KB

          • memory/1316-55-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1316-10-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

            Filesize

            84KB

          • memory/1316-52-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1316-51-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

            Filesize

            20KB

          • memory/1316-16-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

            Filesize

            84KB

          • memory/1316-48-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

            Filesize

            20KB

          • memory/1316-35-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-18-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

            Filesize

            84KB

          • memory/1316-20-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

            Filesize

            84KB

          • memory/1316-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1316-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1316-25-0x0000000001F50000-0x0000000001F56000-memory.dmp

            Filesize

            24KB

          • memory/1316-28-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-31-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-33-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-47-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-32-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-17-0x0000000000AA0000-0x0000000000AB5000-memory.dmp

            Filesize

            84KB

          • memory/1316-36-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-39-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-40-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-38-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-37-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-41-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-42-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-46-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-44-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1316-45-0x0000000001F60000-0x0000000001F70000-memory.dmp

            Filesize

            64KB

          • memory/1684-1-0x0000000002580000-0x0000000002680000-memory.dmp

            Filesize

            1024KB

          • memory/1684-4-0x0000000000400000-0x0000000002290000-memory.dmp

            Filesize

            30.6MB

          • memory/1684-14-0x0000000000400000-0x0000000002290000-memory.dmp

            Filesize

            30.6MB

          • memory/1684-2-0x0000000002540000-0x0000000002553000-memory.dmp

            Filesize

            76KB

          • memory/2920-15-0x0000000000400000-0x0000000002290000-memory.dmp

            Filesize

            30.6MB

          • memory/2920-9-0x0000000002B70000-0x0000000002B83000-memory.dmp

            Filesize

            76KB

          • memory/2920-8-0x00000000024D0000-0x00000000025D0000-memory.dmp

            Filesize

            1024KB