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NewOpenPortMonitor.ps1
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NewOpenPortMonitor.ps1
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###########################################################################################
# #
# This shell is used to monitor for new open ports on a computer #
# Any TCP connections to a device are logged into a file. #
# #
# Author: Rob Osborne #
# Alias: tobor #
# https://roberthosborne.com #
# #
###########################################################################################
param()
Write-Verbose "Monitors for Bind Shells"
$PreviouslyOpenPorts = "78"
# I dont use the email alert for alerting me when new ports are opened however the option is available if you want it
$CurrentlyOpenPorts = Get-NetTCPConnection -State 'Listen' | Group-Object -Property 'LocalPort' -NoElement
If ($PreviouslyOpenPorts -ne $CurrentlyOpenPorts.Count)
{
# I found the emails to be annoying buy you are welcome to use them. It is easier just to keep an eye on the log files created.
# Just uncomment the below line and fill in your information to receive email alerts when a new port is opened on a device.
# Send-MailMessage -From '[email protected]' -To '[email protected]' -Body 'If you have received this email it is because a new port was opened. If this was due to a user configuration or new application you may disregard.' -Subject "ALERT: New Listening Port Opened on $env:COMPUTERNAME" -SmtpServer smtpserver.com -Priority Normal
} # End If
#----------------------------------------------------------------------------------------------
Write-Verbose "Monitors for Reverse Shells"
$EstablishedConnections = Get-NetTCPConnection -State 'Established' | Sort-Object -Property 'RemoteAddress' -Unique | Select-Object 'LocalPort', 'RemoteAddress', 'RemotePort', 'State', 'AppliedSetting', 'OwningProcess', 'CreationTime'
If (!(Test-Path -Path 'C:\Users\Public\Documents\ConnectionHistory.csv'))
{
$EstablishedConnections | Export-Csv -Path 'C:\Users\Public\Documents\ConnectionHistory.csv' -NoTypeInformation
ForEach ($Established in $EstablishedConnections.RemoteAddress)
{
Resolve-DnsName $Established -ErrorAction 'SilentlyContinue' | Select-Object 'Name', 'Type', 'NameHost' | Export-Csv -Path 'C:\Users\Public\Documents\ConnectionDNSHistory.csv'
} # End ForEach
}# End If
Else
{
$NewConnections = Compare-Object -ReferenceObject (Import-Csv -Path 'C:\Users\Public\Documents\ConnectionHistory.csv') -DifferenceObject $EstablishedConnections -Property 'RemoteAddress' | Where-Object -Process { $_.SideIndicator -like '=>'} | Select-Object -ExpandProperty 'RemoteAddress'
ForEach ($NewConnection in $NewConnections)
{
$EstablishedConnections | Where-Object -Property 'RemoteAddress' -like $NewConnection | Export-Csv -Path 'C:\Users\Public\Documents\ConnectionHistory.csv' -Append
Resolve-DnsName -Name $NewConnection -ErrorAction 'SilentlyContinue' | Select-Object 'Name', 'Type', 'NameHost' | Export-Csv -Path 'C:\Users\Public\Documents\ConnectionDNSHistory.csv' -Append
} # End ForEach
} # End Else
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