Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240704-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-07-2024 07:06

General

  • Target

    AvDJi40xp_9fyz7RPmKdbxb4.exe

  • Size

    229KB

  • MD5

    b40b6b9bd2f7d17a65c72469ee2e2cfa

  • SHA1

    859ffdfda568b34e1c3ded9f846dea6e8774f5b5

  • SHA256

    f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583

  • SHA512

    7a4b7171000f8dad0eed766e212ee6c9ebf6431175291442524383232f5455f6bc3e8b224c31dc8bf48ad0cba4ef7637edd4dcc8f32e48f93fb9ea7036adeae1

  • SSDEEP

    3072:DI/quXXuYu/IdYKV97eRuWYxYBouZdSzBS7sy4iIb:DYqKXzEIzSbYxYTAS7W

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) 2 TTPs
  • Modifies Windows Firewall 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AvDJi40xp_9fyz7RPmKdbxb4.exe
    "C:\Users\Admin\AppData\Local\Temp\AvDJi40xp_9fyz7RPmKdbxb4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3824
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vkvsmhit\
      2⤵
        PID:3372
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kzrydbgy.exe" C:\Windows\SysWOW64\vkvsmhit\
        2⤵
          PID:4408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vkvsmhit binPath= "C:\Windows\SysWOW64\vkvsmhit\kzrydbgy.exe /d\"C:\Users\Admin\AppData\Local\Temp\AvDJi40xp_9fyz7RPmKdbxb4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:912
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vkvsmhit "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vkvsmhit
          2⤵
          • Launches sc.exe
          PID:5112
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:3080
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4208,i,17211346206607097582,14783440229797954268,262144 --variations-seed-version --mojo-platform-channel-handle=4192 /prefetch:8
        1⤵
          PID:4420
        • C:\Windows\SysWOW64\vkvsmhit\kzrydbgy.exe
          C:\Windows\SysWOW64\vkvsmhit\kzrydbgy.exe /d"C:\Users\Admin\AppData\Local\Temp\AvDJi40xp_9fyz7RPmKdbxb4.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3436
          • 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:1392

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

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

          Filesize

          13.5MB

          MD5

          029a722f5fc12679da208894f5578579

          SHA1

          1ea5a2fdef8dcba5243f68e018a752c2942d17cb

          SHA256

          b098e5fd37bc758b51a0aeb501b301f7b35a44eac8c56deb7c6aef0e2f776b49

          SHA512

          2f055863d29f82320fdfc68e585ccdc4cdea91da2f77ea4e4ccd5ce96d1723e7302fd3db5ff60006080ea160016cb42aaf8239555c956ed9eedc8baa49dbe4f0

        • memory/1392-43-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-32-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-41-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-42-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-18-0x0000000002200000-0x000000000240F000-memory.dmp

          Filesize

          2.1MB

        • memory/1392-28-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-12-0x0000000000320000-0x0000000000335000-memory.dmp

          Filesize

          84KB

        • memory/1392-13-0x0000000000320000-0x0000000000335000-memory.dmp

          Filesize

          84KB

        • memory/1392-25-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-22-0x00000000009D0000-0x00000000009D6000-memory.dmp

          Filesize

          24KB

        • memory/1392-21-0x0000000002200000-0x000000000240F000-memory.dmp

          Filesize

          2.1MB

        • memory/1392-49-0x0000000007100000-0x000000000750B000-memory.dmp

          Filesize

          4.0MB

        • memory/1392-53-0x00000000025E0000-0x00000000025E7000-memory.dmp

          Filesize

          28KB

        • memory/1392-52-0x0000000007100000-0x000000000750B000-memory.dmp

          Filesize

          4.0MB

        • memory/1392-48-0x00000000025D0000-0x00000000025D5000-memory.dmp

          Filesize

          20KB

        • memory/1392-45-0x00000000025D0000-0x00000000025D5000-memory.dmp

          Filesize

          20KB

        • memory/1392-44-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-29-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-8-0x0000000000320000-0x0000000000335000-memory.dmp

          Filesize

          84KB

        • memory/1392-30-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-39-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-40-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-38-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-37-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-36-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-35-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-34-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-33-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/1392-31-0x00000000009F0000-0x0000000000A00000-memory.dmp

          Filesize

          64KB

        • memory/3436-11-0x0000000000400000-0x0000000002820000-memory.dmp

          Filesize

          36.1MB

        • memory/3824-3-0x0000000000400000-0x0000000000415000-memory.dmp

          Filesize

          84KB

        • memory/3824-61-0x00000000029C0000-0x00000000029D3000-memory.dmp

          Filesize

          76KB

        • memory/3824-2-0x00000000029C0000-0x00000000029D3000-memory.dmp

          Filesize

          76KB

        • memory/3824-10-0x0000000000400000-0x0000000002820000-memory.dmp

          Filesize

          36.1MB

        • memory/3824-60-0x0000000002A30000-0x0000000002B30000-memory.dmp

          Filesize

          1024KB

        • memory/3824-1-0x0000000002A30000-0x0000000002B30000-memory.dmp

          Filesize

          1024KB

        • memory/3824-62-0x0000000000400000-0x0000000000415000-memory.dmp

          Filesize

          84KB