Analysis

  • max time kernel
    146s
  • max time network
    152s
  • 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 04:02

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
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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:3584
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cjdlqqfr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjivddlp.exe" C:\Windows\SysWOW64\cjdlqqfr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1100
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create cjdlqqfr binPath= "C:\Windows\SysWOW64\cjdlqqfr\cjivddlp.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:4152
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description cjdlqqfr "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3008
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start cjdlqqfr
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1524
    • 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:436
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3584 -s 1032
      2⤵
      • Program crash
      PID:2064
  • C:\Windows\SysWOW64\cjdlqqfr\cjivddlp.exe
    C:\Windows\SysWOW64\cjdlqqfr\cjivddlp.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:4968
    • 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:2908
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4968 -s 532
      2⤵
      • Program crash
      PID:3580
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3584 -ip 3584
    1⤵
      PID:2484
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4968 -ip 4968
      1⤵
        PID:1628

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.9MB

        MD5

        92b7aae67f0f69307fa98356be75abc5

        SHA1

        9c83c9be00e99483b75d1d374fd91a6e8d3f86c5

        SHA256

        77a3975728df39dd0dbb14038936f709d4b370d1b50f7a39a09e311c9c4f3caa

        SHA512

        13478a6da1ce69363e3d514c84f3a205f16aed8b7becf0fc79a0435ac922300acef9f98b517a816389ee74b5db7211f9eb57fff2d2106628942052c866555bd0

      • memory/2908-47-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

        Filesize

        20KB

      • memory/2908-24-0x0000000001D90000-0x0000000001D96000-memory.dmp

        Filesize

        24KB

      • memory/2908-21-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/2908-45-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-27-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-30-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-31-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-32-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-46-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-15-0x00000000008E0000-0x00000000008F5000-memory.dmp

        Filesize

        84KB

      • memory/2908-16-0x00000000008E0000-0x00000000008F5000-memory.dmp

        Filesize

        84KB

      • memory/2908-33-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-23-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/2908-55-0x00000000029D0000-0x00000000029D7000-memory.dmp

        Filesize

        28KB

      • memory/2908-54-0x0000000007500000-0x000000000790B000-memory.dmp

        Filesize

        4.0MB

      • memory/2908-51-0x0000000007500000-0x000000000790B000-memory.dmp

        Filesize

        4.0MB

      • memory/2908-50-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

        Filesize

        20KB

      • memory/2908-34-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-13-0x00000000008E0000-0x00000000008F5000-memory.dmp

        Filesize

        84KB

      • memory/2908-35-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-39-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-43-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-42-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-41-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-40-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-44-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-38-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-37-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/2908-36-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

        Filesize

        64KB

      • memory/3584-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3584-1-0x0000000000640000-0x0000000000740000-memory.dmp

        Filesize

        1024KB

      • memory/3584-8-0x0000000000620000-0x0000000000633000-memory.dmp

        Filesize

        76KB

      • memory/3584-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3584-7-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/3584-2-0x0000000000620000-0x0000000000633000-memory.dmp

        Filesize

        76KB

      • memory/4968-18-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/4968-12-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB

      • memory/4968-11-0x0000000000400000-0x0000000000539000-memory.dmp

        Filesize

        1.2MB