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Analysis

  • max time kernel
    144s
  • 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
    01/09/2024, 13:42

General

  • Target

    4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1.exe

  • Size

    12.5MB

  • MD5

    c4c9428ea6a30325f8ac6a3fecc199a1

  • SHA1

    e8c27d01e8e1b4f11f6183e8ba4b3065392349ce

  • SHA256

    4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1

  • SHA512

    b052061f5936ee2f30fc18e81daa9542451a1ad58235bd180e7d01fa49977813945492890a1a37a3cec59bb261a626cd175f12ac85bec9e000273159980e7a33

  • SSDEEP

    196608:TPRMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMP:T

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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
  • 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.

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1.exe
    "C:\Users\Admin\AppData\Local\Temp\4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5176
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ectccbpx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3028
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eqxrwcpx.exe" C:\Windows\SysWOW64\ectccbpx\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5996
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ectccbpx binPath= "C:\Windows\SysWOW64\ectccbpx\eqxrwcpx.exe /d\"C:\Users\Admin\AppData\Local\Temp\4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:6056
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ectccbpx "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5144
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ectccbpx
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5828
    • 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:3648
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5176 -s 592
      2⤵
      • Program crash
      PID:1700
  • C:\Windows\SysWOW64\ectccbpx\eqxrwcpx.exe
    C:\Windows\SysWOW64\ectccbpx\eqxrwcpx.exe /d"C:\Users\Admin\AppData\Local\Temp\4fb9ec0883d7b509a16d73e2181f5236d13042706cb8bbe82091f8a9db4575d1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2316
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:3168
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2316 -s 520
      2⤵
      • Program crash
      PID:5232
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 5176 -ip 5176
    1⤵
      PID:4556
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2316 -ip 2316
      1⤵
        PID:4956

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.1MB

        MD5

        1906894822a56674add4f746e5d1b137

        SHA1

        7f0037e9e27d00706fa3329bd973eea5259ac745

        SHA256

        5b7a38d91298826357ed0c2860c95238d05688e957f2728fc35bd145afd7d774

        SHA512

        c74dec7fcfaba030bca9fc4e14623078ef85bfe98a20ffd74282c3a9bb7b8cfcfb09725cd1d7cc99bf55f60bc6120ecfb143ed4a487d6aec5bf5052a89620850

      • memory/2316-12-0x0000000000400000-0x0000000000871000-memory.dmp

        Filesize

        4.4MB

      • memory/2316-15-0x0000000000400000-0x0000000000871000-memory.dmp

        Filesize

        4.4MB

      • memory/3168-11-0x0000000000170000-0x0000000000185000-memory.dmp

        Filesize

        84KB

      • memory/3168-14-0x0000000000170000-0x0000000000185000-memory.dmp

        Filesize

        84KB

      • memory/3168-16-0x0000000000170000-0x0000000000185000-memory.dmp

        Filesize

        84KB

      • memory/5176-1-0x00000000008B0000-0x00000000009B0000-memory.dmp

        Filesize

        1024KB

      • memory/5176-2-0x00000000001C0000-0x00000000001D3000-memory.dmp

        Filesize

        76KB

      • memory/5176-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5176-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5176-9-0x00000000001C0000-0x00000000001D3000-memory.dmp

        Filesize

        76KB

      • memory/5176-8-0x0000000000400000-0x0000000000871000-memory.dmp

        Filesize

        4.4MB