Invoke-SessionHunter – Retrieve And Display Information About Active User Sessions On Remote Computers (No Admin Privileges Required)

Retrieve and display information about active user sessions on remote computers. No admin privileges required.

The tool leverages the remote registry service to query the HKEY_USERS registry hive on the remote computers. It identifies and extracts Security Identifiers (SIDs) associated with active user sessions, and translates these into corresponding usernames, offering insights into who is currently logged in.

If the -CheckAdminAccess switch is provided, it will gather sessions by authenticating to targets where you have local admin access using Invoke-WMIRemoting (which most likely will retrieve more results)

It’s important to note that the remote registry service needs to be running on the remote computer for the tool to work effectively. In my tests, if the service is stopped but its Startup type is configured to “Automatic” or “Manual”, the service will start automatically on the target computer once queried (this is native behavior), and sessions information will be retrieved. If set to “Disabled” no session information can be retrieved from the target.

Usage:

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/Leo4j/Invoke-SessionHunter/main/Invoke-SessionHunter.ps1')

If run without parameters or switches it will retrieve active sessions for all computers in the current domain by querying the registry

Invoke-SessionHunter

Gather sessions by authenticating to targets where you have local admin access

Invoke-SessionHunter -CheckAsAdmin

You can optionally provide credentials in the following format

Invoke-SessionHunter -CheckAsAdmin -UserName "ferrari\Administrator" -Password "P@ssw0rd!"

You can also use the -FailSafe switch, which will direct the tool to proceed if the target remote registry becomes unresponsive.

This works in cobination with -Timeout | Default = 2, increase for slower networks.

Invoke-SessionHunter -FailSafe

Invoke-SessionHunter -FailSafe -Timeout 5

Use the -Match switch to show only targets where you have admin access and a privileged user is logged in

Invoke-SessionHunter -Match

All switches can be combined

Invoke-SessionHunter -CheckAsAdmin -UserName "ferrari\Administrator" -Password "P@ssw0rd!" -FailSafe -Timeout 5 -Match

Specify the target domain

Invoke-SessionHunter -Domain contoso.local

Specify a comma-separated list of targets or the full path to a file containing a list of targets – one per line

Invoke-SessionHunter -Targets "DC01,Workstation01.contoso.local"

Invoke-SessionHunter -Targets c:\Users\Public\Documents\targets.txt

Retrieve and display information about active user sessions on servers only

Invoke-SessionHunter -Servers

Retrieve and display information about active user sessions on workstations only

Invoke-SessionHunter -Workstations

Show active session for the specified user only

Invoke-SessionHunter -Hunt "Administrator"

Exclude localhost from the sessions retrieval

Invoke-SessionHunter -IncludeLocalHost

Return custom PSObjects instead of table-formatted results

Invoke-SessionHunter -RawResults

Do not run a port scan to enumerate for alive hosts before trying to retrieve sessions

Note: if a host is not reachable it will hang for a while

Invoke-SessionHunter -NoPortScan