Analysis

  • max time kernel
    74s
  • max time network
    77s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 07:19

General

  • Target

    aqsfwoz.exe

  • Size

    11.8MB

  • MD5

    07f1415abcdb3eb7169afb3d85d9dae5

  • SHA1

    b44b0e5a810ce27106fb31a4f955210210c53929

  • SHA256

    256663a3854aa83f75a6ead0fdf1668833e9abe83a863f09544b7a7e71764414

  • SHA512

    6bf34ded56adba5af36256039e69f0157c344b99dbb4689325b6e55c4f1172a70fda4c7adcb2c908e402f91145722207aa01551dde93121289ccb49d2c48f447

  • SSDEEP

    6144:Mw0VDy74AW/47pwSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS:Mw0VD7AW/49

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe
    "C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3408
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jftxaiax\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5084
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cwygcwcv.exe" C:\Windows\SysWOW64\jftxaiax\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2592
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create jftxaiax binPath= "C:\Windows\SysWOW64\jftxaiax\cwygcwcv.exe /d\"C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:340
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description jftxaiax "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3896
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start jftxaiax
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4976
    • 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:2468
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3408 -s 600
      2⤵
      • Program crash
      PID:5068
  • C:\Windows\SysWOW64\jftxaiax\cwygcwcv.exe
    C:\Windows\SysWOW64\jftxaiax\cwygcwcv.exe /d"C:\Users\Admin\AppData\Local\Temp\aqsfwoz.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1320
    • 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:4720
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1320 -s 516
      2⤵
      • Program crash
      PID:3480
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3408 -ip 3408
    1⤵
      PID:1780
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1320 -ip 1320
      1⤵
        PID:3368

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.8MB

        MD5

        47d85d8220d16187d798314d3fc96105

        SHA1

        cd955b6e53ff40690ee9e5fb526b617b18ad5d77

        SHA256

        5b928cfe2ce6919a078d56095de0e2175411c4e42673d5f3cc97e8aed5209124

        SHA512

        00a0bb75afcc12082d0600d1cd111fc8c4cad9effb743dd9225ab9d6c039ad9059fcb005d0be1d13dd232a61f18d556bfae2e9f8da5e8e2d203e586077b210ed

      • memory/1320-18-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/1320-8-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/1320-9-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/1320-10-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/3408-2-0x00000000006C0000-0x00000000006D3000-memory.dmp

        Filesize

        76KB

      • memory/3408-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3408-11-0x0000000000730000-0x0000000000830000-memory.dmp

        Filesize

        1024KB

      • memory/3408-1-0x0000000000730000-0x0000000000830000-memory.dmp

        Filesize

        1024KB

      • memory/3408-16-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3408-15-0x00000000006C0000-0x00000000006D3000-memory.dmp

        Filesize

        76KB

      • memory/3408-14-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/4720-49-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

        Filesize

        20KB

      • memory/4720-42-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-20-0x0000000000680000-0x0000000000695000-memory.dmp

        Filesize

        84KB

      • memory/4720-23-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/4720-29-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-57-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

        Filesize

        28KB

      • memory/4720-53-0x0000000007600000-0x0000000007A0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4720-52-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

        Filesize

        20KB

      • memory/4720-12-0x0000000000680000-0x0000000000695000-memory.dmp

        Filesize

        84KB

      • memory/4720-48-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-56-0x0000000007600000-0x0000000007A0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4720-47-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-46-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-45-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-44-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-19-0x0000000000680000-0x0000000000695000-memory.dmp

        Filesize

        84KB

      • memory/4720-41-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-40-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-39-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-38-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-37-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-36-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-35-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-34-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-33-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-32-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB

      • memory/4720-26-0x00000000007F0000-0x00000000007F6000-memory.dmp

        Filesize

        24KB

      • memory/4720-25-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/4720-43-0x0000000001D90000-0x0000000001DA0000-memory.dmp

        Filesize

        64KB