Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-09-2024 15:15

General

  • Target

    H3nfKrgQbi.exe

  • Size

    415KB

  • MD5

    1c5083792acfccf5d90db80884569ace

  • SHA1

    6be243663a2d173dcd728146f2a3d1a5a974ff38

  • SHA256

    27ca44d4fca5a29c0018efeebbda04250739a546e4b7879bd5a547aaea1de80d

  • SHA512

    8af309adcaed0055ca8b2c879a1ff16e9d0d853ab3837c94719d09c03bf27b32125581f525ef99caa4488b184bfc5565b033333cd4af9e4240aa23963dd76a1b

  • SSDEEP

    6144:+nhYTBI6ONsWWqOaejSlD8viNV43Km3Wlz8+5FXCnFk:2aTy6OlO3GDyYnSC

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.

  • Deletes itself 1 IoCs
  • 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.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\H3nfKrgQbi.exe
    "C:\Users\Admin\AppData\Local\Temp\H3nfKrgQbi.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1540
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kvitixfb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1508
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\twtmdfzp.exe" C:\Windows\SysWOW64\kvitixfb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:936
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kvitixfb binPath= "C:\Windows\SysWOW64\kvitixfb\twtmdfzp.exe /d\"C:\Users\Admin\AppData\Local\Temp\H3nfKrgQbi.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3304
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kvitixfb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2076
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kvitixfb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5068
    • 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
      • System Location Discovery: System Language Discovery
      PID:3604
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1540 -s 1044
      2⤵
      • Program crash
      PID:4372
  • C:\Windows\SysWOW64\kvitixfb\twtmdfzp.exe
    C:\Windows\SysWOW64\kvitixfb\twtmdfzp.exe /d"C:\Users\Admin\AppData\Local\Temp\H3nfKrgQbi.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2684
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:4528
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2684 -s 536
      2⤵
      • Program crash
      PID:2368
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1540 -ip 1540
    1⤵
      PID:3748
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2684 -ip 2684
      1⤵
        PID:1908

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.6MB

        MD5

        11ba1a71640f2f604bd459d94678c9ae

        SHA1

        2f871af5a73e936b5825a6a74c2bb000fb98f985

        SHA256

        819caeaf5f5d08fa85b34d105c7bc27157849a947dd8b3ce164b07a5cc0fc212

        SHA512

        6495718a6e127f104d1c618200c0b1e566778cb7fea1d5dc4c3096ef6c5841c22d58a28c7753e76bf5c3983ef4db128c0c13b676b3912a4a8cf6742f5f42fdac

      • memory/1540-2-0x0000000002610000-0x0000000002623000-memory.dmp

        Filesize

        76KB

      • memory/1540-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1540-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1540-8-0x0000000002610000-0x0000000002623000-memory.dmp

        Filesize

        76KB

      • memory/1540-7-0x0000000000400000-0x000000000247F000-memory.dmp

        Filesize

        32.5MB

      • memory/1540-1-0x0000000002650000-0x0000000002750000-memory.dmp

        Filesize

        1024KB

      • memory/2684-15-0x0000000000400000-0x000000000247F000-memory.dmp

        Filesize

        32.5MB

      • memory/4528-41-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-35-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-13-0x0000000000450000-0x0000000000465000-memory.dmp

        Filesize

        84KB

      • memory/4528-36-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-52-0x0000000007550000-0x0000000007557000-memory.dmp

        Filesize

        28KB

      • memory/4528-48-0x0000000007000000-0x000000000740B000-memory.dmp

        Filesize

        4.0MB

      • memory/4528-47-0x00000000025F0000-0x00000000025F5000-memory.dmp

        Filesize

        20KB

      • memory/4528-44-0x00000000025F0000-0x00000000025F5000-memory.dmp

        Filesize

        20KB

      • memory/4528-43-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-42-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-11-0x0000000000450000-0x0000000000465000-memory.dmp

        Filesize

        84KB

      • memory/4528-40-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-39-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-38-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-37-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-14-0x0000000000450000-0x0000000000465000-memory.dmp

        Filesize

        84KB

      • memory/4528-34-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-33-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-32-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-31-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-30-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-29-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-27-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-24-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-51-0x0000000007000000-0x000000000740B000-memory.dmp

        Filesize

        4.0MB

      • memory/4528-21-0x0000000002310000-0x0000000002316000-memory.dmp

        Filesize

        24KB

      • memory/4528-20-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/4528-28-0x0000000002320000-0x0000000002330000-memory.dmp

        Filesize

        64KB

      • memory/4528-17-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB