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Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/09/2023, 23:25

General

  • Target

    file.exe

  • Size

    214KB

  • MD5

    853a0ef89b1532e80c7e14d14cbf0073

  • SHA1

    8d83ff39485dab7df49d527cca9bfc53938597e8

  • SHA256

    a34e57fcf36648d26b35a8e3e43d4c523bd07216bda22c2a283c4a6a22e7d070

  • SHA512

    b1eb21f26a6c7857356b7b8578cfbc0bdb1bb9a3ae6d0c7b9d0968e9bce4c06544124f03f4cbcd7e975be6f8237cdd10f22c12fecaddfbd8854c687503839c9d

  • SSDEEP

    3072:+AXMadk9mLIqG7/IovYa4EVFW5hgWAErvf+XSLwVtxjpkwnwxLB5bSDT0K:TMaO9mL07/IrMF1WFVLwlZwdnSDT

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) 1 TTPs
  • Modifies Windows Firewall 1 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.

  • 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4660
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jcslrynd\
      2⤵
        PID:1224
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rybwvppj.exe" C:\Windows\SysWOW64\jcslrynd\
        2⤵
          PID:2376
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jcslrynd binPath= "C:\Windows\SysWOW64\jcslrynd\rybwvppj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1772
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jcslrynd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jcslrynd
          2⤵
          • Launches sc.exe
          PID:2264
        • 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
          PID:4900
      • C:\Windows\SysWOW64\jcslrynd\rybwvppj.exe
        C:\Windows\SysWOW64\jcslrynd\rybwvppj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2424
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4236

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.4MB

        MD5

        0bd5bb40bd5d97a350eb98539849628d

        SHA1

        bf1b672917ad960bdfbf8473a77cba7771355825

        SHA256

        89301647478fa87b72203032cb9439b31cb1f7d3237340fea85c519219deffd6

        SHA512

        2e88a8d0a66d551c503ff2ca7458a43ca1d33ddf5f6aac54e2a539159a3ddfc2e89fd347a86484962e0cc4f0c96bc1ae652cc82481d1203e92c00f7f850b9fbc

      • C:\Windows\SysWOW64\jcslrynd\rybwvppj.exe

        Filesize

        11.4MB

        MD5

        0bd5bb40bd5d97a350eb98539849628d

        SHA1

        bf1b672917ad960bdfbf8473a77cba7771355825

        SHA256

        89301647478fa87b72203032cb9439b31cb1f7d3237340fea85c519219deffd6

        SHA512

        2e88a8d0a66d551c503ff2ca7458a43ca1d33ddf5f6aac54e2a539159a3ddfc2e89fd347a86484962e0cc4f0c96bc1ae652cc82481d1203e92c00f7f850b9fbc

      • memory/2424-12-0x0000000000400000-0x0000000000486000-memory.dmp

        Filesize

        536KB

      • memory/2424-9-0x0000000000400000-0x0000000000486000-memory.dmp

        Filesize

        536KB

      • memory/4236-31-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-40-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-54-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

        Filesize

        28KB

      • memory/4236-53-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4236-50-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/4236-10-0x00000000009D0000-0x00000000009E5000-memory.dmp

        Filesize

        84KB

      • memory/4236-49-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/4236-15-0x00000000009D0000-0x00000000009E5000-memory.dmp

        Filesize

        84KB

      • memory/4236-16-0x00000000009D0000-0x00000000009E5000-memory.dmp

        Filesize

        84KB

      • memory/4236-18-0x00000000009D0000-0x00000000009E5000-memory.dmp

        Filesize

        84KB

      • memory/4236-19-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4236-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4236-23-0x0000000001F80000-0x0000000001F86000-memory.dmp

        Filesize

        24KB

      • memory/4236-26-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-29-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-30-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-32-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-44-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-43-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-34-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-36-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-35-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-37-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-38-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-39-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-46-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/4236-41-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-42-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-33-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4236-45-0x0000000001F90000-0x0000000001FA0000-memory.dmp

        Filesize

        64KB

      • memory/4660-0-0x00000000021D0000-0x00000000021E5000-memory.dmp

        Filesize

        84KB

      • memory/4660-6-0x0000000000400000-0x0000000000486000-memory.dmp

        Filesize

        536KB

      • memory/4660-1-0x00000000021F0000-0x0000000002203000-memory.dmp

        Filesize

        76KB

      • memory/4660-2-0x0000000000400000-0x0000000000486000-memory.dmp

        Filesize

        536KB

      • memory/4660-8-0x00000000021F0000-0x0000000002203000-memory.dmp

        Filesize

        76KB

      • memory/4660-7-0x00000000021D0000-0x00000000021E5000-memory.dmp

        Filesize

        84KB