Analysis

  • max time kernel
    145s
  • max time network
    148s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    21-09-2024 21:31

General

  • Target

    2IFYYPRUgO.exe

  • Size

    447KB

  • MD5

    dd9983e56e44b300e97fbead17bbb8ec

  • SHA1

    bcfc4f542d1824b23b5beefe94e8eaa9d487e037

  • SHA256

    16c9a4debb518681ece83ec9f4eb3edfab08cc4231243db1949a64c80e017aa4

  • SHA512

    02663157f5a109a122897fb0ac32eda38a9ed5d289b70ef1541e3ca800e02a41d471879e04d1bd59eb2110e4a0f8cd7851e3bacba04147ffa488997e8a100457

  • SSDEEP

    6144:XZBpoyz+AlKudZ10mVtZ4ELIgjdo7d5UNo4MaGSlrLo5FXCnFk:Xruyz+PMZ10mVrLL/27gWxerCSC

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
  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe
    "C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5036
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yzmoehvl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dxcavyvx.exe" C:\Windows\SysWOW64\yzmoehvl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:484
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yzmoehvl binPath= "C:\Windows\SysWOW64\yzmoehvl\dxcavyvx.exe /d\"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4728
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yzmoehvl "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1200
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yzmoehvl
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1820
    • 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:1604
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5036 -s 612
      2⤵
      • Program crash
      PID:4920
  • C:\Windows\SysWOW64\yzmoehvl\dxcavyvx.exe
    C:\Windows\SysWOW64\yzmoehvl\dxcavyvx.exe /d"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3328
    • 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:1992
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3328 -s 560
      2⤵
      • Program crash
      PID:5092
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3328 -ip 3328
    1⤵
      PID:1524
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5036 -ip 5036
      1⤵
        PID:4736

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.0MB

        MD5

        47cd6688c09ea84030c2dbfd4eadc502

        SHA1

        61adcd0de2e16da1f31c6494a7dcb6a2a2ef9723

        SHA256

        46e3f91023d1f7a083f0baecc6d35a6675146388c1e578c038f64b83c7f3a3f3

        SHA512

        2d0090bed6f0b1528215ca3bcc9031b9f933b495e4c6095638fb0a4ec4776e7592f58412aa0867ba1ae33ffe931619b5b8cb2aa0995e976d7935ff16fcd00a46

      • memory/1992-42-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-8-0x0000000000AD0000-0x0000000000AE5000-memory.dmp

        Filesize

        84KB

      • memory/1992-43-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1992-21-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

        Filesize

        24KB

      • memory/1992-24-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-27-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-28-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-14-0x0000000000AD0000-0x0000000000AE5000-memory.dmp

        Filesize

        84KB

      • memory/1992-15-0x0000000000AD0000-0x0000000000AE5000-memory.dmp

        Filesize

        84KB

      • memory/1992-17-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1992-52-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

        Filesize

        28KB

      • memory/1992-51-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/1992-48-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/1992-47-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/1992-44-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/1992-29-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-41-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-30-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-40-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-39-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-38-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-37-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-36-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-35-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-34-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-33-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-32-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/1992-31-0x0000000001F60000-0x0000000001F70000-memory.dmp

        Filesize

        64KB

      • memory/3328-10-0x0000000000400000-0x0000000002488000-memory.dmp

        Filesize

        32.5MB

      • memory/5036-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5036-2-0x00000000042D0000-0x00000000042E3000-memory.dmp

        Filesize

        76KB

      • memory/5036-11-0x0000000000400000-0x0000000002488000-memory.dmp

        Filesize

        32.5MB

      • memory/5036-12-0x00000000042D0000-0x00000000042E3000-memory.dmp

        Filesize

        76KB

      • memory/5036-13-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/5036-1-0x0000000002670000-0x0000000002770000-memory.dmp

        Filesize

        1024KB