Analysis

  • max time kernel
    145s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-08-2024 09:13

General

  • Target

    bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe

  • Size

    13.1MB

  • MD5

    26dc30509b939d95f3e7ff81bd9c02cd

  • SHA1

    95503eafd7e3bbe829ba4f9cff6863c620e1ac27

  • SHA256

    bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9

  • SHA512

    24a7543199b06358b296e4c0bedb3365c3e29ac054aa3ba7c0a22e49079fa6d672e2dfc25ca8024a06526f16a4515bbc1e8798d715a3416ab4809f9f8a487fb4

  • SSDEEP

    3072:rBM7AAAPsPmgSn/HzaHWgwwQjHF0kKUyodrMpNLbdr05b7pNeoAhTGl9NZ9k222H:C7h1HSn/WHnQjphwNXdr0gU9z

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\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe
    "C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2280
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\juoaxesb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nzuryxxl.exe" C:\Windows\SysWOW64\juoaxesb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2068
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create juoaxesb binPath= "C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe /d\"C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1996
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description juoaxesb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3980
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start juoaxesb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2376
    • 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:1008
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2280 -s 1048
      2⤵
      • Program crash
      PID:3516
  • C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe
    C:\Windows\SysWOW64\juoaxesb\nzuryxxl.exe /d"C:\Users\Admin\AppData\Local\Temp\bc08635f68d183add0e1c746f47d07815a903aac07c3334131cfc808f85b8bd9.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4144
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2632
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4144 -s 516
      2⤵
      • Program crash
      PID:548
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2280 -ip 2280
    1⤵
      PID:1364
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4144 -ip 4144
      1⤵
        PID:4388

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.7MB

        MD5

        7a05f7a09f20acf9c1e87b6f6c49d2e3

        SHA1

        dc1c631126fc8f7c99db308c0a1b62bba3181f29

        SHA256

        db9549fcbb24e421f17f9e3ee3a303635712d95024d3a0a8848896aafa22509c

        SHA512

        eed8a832b08d8dedba7287208d1f43608bc517c9494daa68bda240de6a75efbcf193cb9d63d8266d648a05310f1bb710668984b4f3f9958f8f596c5cdb321f21

      • memory/2280-1-0x0000000000BC0000-0x0000000000CC0000-memory.dmp

        Filesize

        1024KB

      • memory/2280-2-0x00000000009A0000-0x00000000009B3000-memory.dmp

        Filesize

        76KB

      • memory/2280-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2280-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2280-8-0x0000000000400000-0x000000000086C000-memory.dmp

        Filesize

        4.4MB

      • memory/2280-9-0x00000000009A0000-0x00000000009B3000-memory.dmp

        Filesize

        76KB

      • memory/2632-12-0x0000000000890000-0x00000000008A5000-memory.dmp

        Filesize

        84KB

      • memory/2632-14-0x0000000000890000-0x00000000008A5000-memory.dmp

        Filesize

        84KB

      • memory/2632-15-0x0000000000890000-0x00000000008A5000-memory.dmp

        Filesize

        84KB

      • memory/4144-11-0x0000000000400000-0x000000000086C000-memory.dmp

        Filesize

        4.4MB

      • memory/4144-17-0x0000000000400000-0x000000000086C000-memory.dmp

        Filesize

        4.4MB