.. /Netsh.exe

Star

Paths:

• C:\WINDOWS\System32\Netsh.exe
• C:\WINDOWS\SysWOW64\Netsh.exe

Resources:

• https://freddiebarrsmith.com/trix/trix.html
• https://htmlpreview.github.io/?https://github.com/MatthewDemaske/blogbackup/blob/master/netshell.html
• https://liberty-shell.com/sec/2018/07/28/netshlep/

Acknowledgements:

• Freddie Barr-Smith
• Riccardo Spolaor
• Mariano Graziano
• Xabier Ugarte-Pedrero

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_netsh_helper_dll_persistence.yml
• Splunk: https://github.com/splunk/security_content/blob/2b87b26bdc2a84b65b1355ffbd5174bdbdb1879c/detections/endpoint/processes_launching_netsh.yml
• Splunk: https://github.com/splunk/security_content/blob/08ed88bd88259c03c771c30170d2934ed0a8f878/detections/deprecated/processes_created_by_netsh.yml
• IOC: Netsh initiating a network connection

Execute

1. Use Netsh in order to execute a .dll file and also gain persistence, every time the netsh command is called

   netsh.exe add helper C:\Users\User\file.dll

   Use case

   Proxy execution of .dll

   Privileges required

   Admin

   Operating systems

   Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

   ATT&CK® technique

   T1546.007

   Tags

   Execute: DLL

   This LOLBAS executes Dynamic-Link Libraries (DLLs).