Analysis

  • max time kernel
    119s
  • max time network
    121s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-10-2024 03:59

General

  • Target

    ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537N.exe

  • Size

    247KB

  • MD5

    fa16a1112580ef5e90e09191b5b7c7b0

  • SHA1

    b89e96ca675fd9046657523e8ed63e2559ae35f2

  • SHA256

    ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537

  • SHA512

    25ec5abdbcc7de061dc3b4c50d5285f0a75f52395f70c52e58397e0f4ed8952cbab22de04287ea2ea987d5fd5a610e453475ad05ea0f2240ad97aebc3aa5f422

  • SSDEEP

    3072:3uaLCc5NJCyZawVL1NbZyEC5ZXVYz3M5coy4ixZ2Hzaej:+aLCEjFZawVL1xuFYc5coIi

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537N.exe
    "C:\Users\Admin\AppData\Local\Temp\ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537N.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4136
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zwmwjqnm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:620
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe" C:\Windows\SysWOW64\zwmwjqnm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4328
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create zwmwjqnm binPath= "C:\Windows\SysWOW64\zwmwjqnm\foufdsk.exe /d\"C:\Users\Admin\AppData\Local\Temp\ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2064
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description zwmwjqnm "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4856
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start zwmwjqnm
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4144
    • 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:1452
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4136 -s 1036
      2⤵
      • Program crash
      PID:1496
  • C:\Windows\SysWOW64\zwmwjqnm\foufdsk.exe
    C:\Windows\SysWOW64\zwmwjqnm\foufdsk.exe /d"C:\Users\Admin\AppData\Local\Temp\ee0a8975ce97cb4e237571b3bde6deb777b1995766c46f89e722e2ee44392537N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2284
    • 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:3332
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2284 -s 516
      2⤵
      • Program crash
      PID:4036
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4136 -ip 4136
    1⤵
      PID:4040
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2284 -ip 2284
      1⤵
        PID:1624

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.0MB

        MD5

        f44697cae56124c7f2757839f3df0f58

        SHA1

        38ba8c0d25d65ab86784ab0d5a598b6dc7193a4b

        SHA256

        abd041004f352b7287a7d51a6d19ad7288a68c0af7481722bded5cf2cdf9dbee

        SHA512

        86f778ee0b14fbbc8513585c8ae8462e2d5e552224886ccc78df0d066bb19ad028dc70ee381d6544831248f25b879cfe648ebf39abd4b2c389a101a3d42e480c

      • memory/2284-11-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/2284-14-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/2284-12-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/3332-51-0x0000000007D80000-0x000000000818B000-memory.dmp

        Filesize

        4.0MB

      • memory/3332-46-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-54-0x0000000007D80000-0x000000000818B000-memory.dmp

        Filesize

        4.0MB

      • memory/3332-23-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/3332-27-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-13-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        Filesize

        84KB

      • memory/3332-30-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-16-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        Filesize

        84KB

      • memory/3332-17-0x0000000000F90000-0x0000000000FA5000-memory.dmp

        Filesize

        84KB

      • memory/3332-42-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-21-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/3332-32-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-24-0x0000000002540000-0x0000000002546000-memory.dmp

        Filesize

        24KB

      • memory/3332-55-0x00000000025F0000-0x00000000025F7000-memory.dmp

        Filesize

        28KB

      • memory/3332-31-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-50-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/3332-47-0x00000000025E0000-0x00000000025E5000-memory.dmp

        Filesize

        20KB

      • memory/3332-33-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-45-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-44-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-43-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-41-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-40-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-39-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-38-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-37-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-36-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-35-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/3332-34-0x0000000002550000-0x0000000002560000-memory.dmp

        Filesize

        64KB

      • memory/4136-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4136-1-0x00000000006D0000-0x00000000007D0000-memory.dmp

        Filesize

        1024KB

      • memory/4136-2-0x0000000002280000-0x0000000002293000-memory.dmp

        Filesize

        76KB

      • memory/4136-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4136-7-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/4136-8-0x0000000002280000-0x0000000002293000-memory.dmp

        Filesize

        76KB