Merge pull request #117 from stufus/add_egress_busting
Add Egress Checking Traffic Generator Module1.6
HarmJ0y
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c6ff79d7b8
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<#
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This module aims to offer the ability to generate arbitrary traffic on the ports specified, using the protocol specified.
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Author: Stuart Morgan (@ukstufus)
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Web: https://github.com/stufus
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#>
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function Invoke-EgressCheck {
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<#
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.SYNOPSIS
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Generates arbitrary traffic on the ports specified, using the protocol specified.
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.DESCRIPTION
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This will attempt to asynchronously generate a connection on each port specified, using the
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protocol specified, to a target. This is most useful when attempting to identify breaches
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in a firewall from an egress perspective. Note that it is quite noisy, but it may be
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appropriate in some situations.
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A listener on the destination IP address will be required. The EgressChecker tool could
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be useful for this (accessible at https://github.com/stufus/egresscheck-framework) or any
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other method of identifying incoming connections will be fine.
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.PARAMETER ip
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The IP address of the target endpoint.
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Example: -ip "10.0.0.1"
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.PARAMETER portrange
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The ports to try. This accepts comma-separated individual port numbers, ranges
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or both.
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Example: -portrange "22-25,53,80,443,445,3306,3389"
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Default: "22-25,53,80,443,445,3306,3389"
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.PARAMETER protocol
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The IP protocol to use. This can be one of TCP, UDP or ALL.
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Example: -protocol "TCP"
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Default: TCP
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.PARAMETER verbose
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The verbosity of the console output.
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If this is unset, there is no intentional verbosity.
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If this is set, it will output:
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't/port' - Sending a TCP packet
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'u/port' - Sending a UDP packet
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'W/tcp' - Waiting (i.e. sleep/delay) after a TCP connection was attempted
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'W/udp' - Waiting (i.e. sleep/delay) after a UDP connection was attempted
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Example: -verbose
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Default: Not verbose
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.PARAMETER delay
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The delay between sending packets. This injects a delay in milliseconds between
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packets generated on a per-port per-protocol basis.
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Example: -delay 100
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Default: 100
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.EXAMPLE
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Invoke-EgressCheck -ip 1.2.3.4 -portrange "22-25,53,80,443,445,3306,3389" -protocol ALL -delay 100 -verbose
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.LINK
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https://github.com/stufus/egresscheck-framework
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#>
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[CmdletBinding()]
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param([string] $ip, [string] $portrange = "22-25,53,80,443,445,3306,3389", [string] $protocol = "TCP", [int] $delay=100)
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if ($ip -NotMatch '^([0-9]{1,3}\.){3}[0-9]{1,3}$') {
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Write-Error "IP not specified"
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return
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}
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Write-Output "EgressCheck started"
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$pr_split = $portrange -split ','
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foreach ($p in $pr_split) {
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if ($p -match '^[0-9]+-[0-9]+$') {
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$prange = $p -split '-'
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$s = [convert]::ToInt32($prange[0])
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$e = [convert]::ToInt32($prange[1])
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Write-Verbose "Now generating traffic on ports $s - $e"
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for ($c = $s;$c -le $e;$c++) {
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egress -ip $ip -port $c -delay $delay -protocol $protocol
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}
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} elseif ($p -match '^[0-9]+$') {
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$c = [convert]::ToInt32($p)
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Write-Verbose "Now generating traffic on port $c"
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egress -ip $ip -port $c -delay $delay -protocol $protocol
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} else {
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Write-Error "Bad port range"
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return
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}
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}
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Write-Output "EgressCheck completed"
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}
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function egress {
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[CmdletBinding()]
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param([string]$ip, [int]$port, [int]$delay, [string]$protocol)
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$protocol_case = $protocol.ToUpper()
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if ($protocol_case -eq "TCP" -Or $protocol_case -eq "ALL") {
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generate_tcp -ip $ip -port $port
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if ($delay -gt 0) {
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Start-Sleep -m ($delay)
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Write-Verbose "W/tcp"
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}
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}
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if ($protocol_case -eq "UDP" -Or $protocol_case -eq "ALL") {
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generate_udp -ip $ip -port $port
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if ($delay -gt 0) {
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Start-Sleep -m ($delay)
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Write-Verbose "W/udp"
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}
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}
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}
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# Send the TCP packet
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function generate_tcp {
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[CmdletBinding()]
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param([string]$ip, [int]$port)
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try {
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$t = New-Object System.Net.Sockets.TCPClient
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$t.BeginConnect($ip, $port, $null, $null) | Out-Null
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$t.Close()
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Write-Verbose "t/$port"
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}
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catch { }
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}
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# Send the UDP packet
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function generate_udp {
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[CmdletBinding()]
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param([string]$ip, [int]$port)
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$d = [system.Text.Encoding]::UTF8.GetBytes(".")
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try {
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$t = New-Object System.Net.Sockets.UDPClient
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$t.Send($d, $d.Length, $ip, $port) | Out-Null
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$t.Close()
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Write-Verbose "u/$port"
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}
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catch { }
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}
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@ -0,0 +1,118 @@
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from lib.common import helpers
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class Module:
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def __init__(self, mainMenu, params=[]):
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# metadata info about the module, not modified during runtime
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self.info = {
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# name for the module that will appear in module menus
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'Name': 'Invoke-EgressCheck',
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# list of one or more authors for the module
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'Author': ['Stuart Morgan <stuart.morgan@mwrinfosecurity.com>'],
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# more verbose multi-line description of the module
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'Description': ('This module will generate traffic on a provided range of ports '
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'and supports both TCP and UDP. Useful to identify direct egress channels.'),
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# True if the module needs to run in the background
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'Background' : False,
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# File extension to save the file as
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'OutputExtension' : None,
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# True if the module needs admin rights to run
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'NeedsAdmin' : False,
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# True if the method doesn't touch disk/is reasonably opsec safe
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# Disabled - this can be a relatively noisy module but sometimes useful
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'OpsecSafe' : False,
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# The minimum PowerShell version needed for the module to run
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'MinPSVersion' : '2',
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# list of any references/other comments
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'Comments': [
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'https://github.com/stufus/egresscheck-framework'
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]
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}
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# any options needed by the module, settable during runtime
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self.options = {
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# format:
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# value_name : {description, required, default_value}
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'Agent' : {
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# The 'Agent' option is the only one that MUST be in a module
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'Description' : 'Agent to generate the source traffic on',
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'Required' : True,
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'Value' : ''
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},
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'ip' : {
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'Description' : 'Target IP Address',
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'Required' : True,
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'Value' : ''
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},
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'protocol' : {
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'Description' : 'The protocol to use. This can be TCP or UDP',
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'Required' : True,
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'Value' : 'TCP'
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},
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'portrange' : {
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'Description' : 'The range of ports to connect on. This can be a comma separated list or dash-separated ranges.',
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'Required' : True,
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'Value' : '22-25,53,80,443,445,3306,3389'
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},
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'delay' : {
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'Description' : 'Delay, in milliseconds, between ports being tested',
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'Required' : True,
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'Value' : '50'
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}
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}
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# save off a copy of the mainMenu object to access external functionality
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# like listeners/agent handlers/etc.
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self.mainMenu = mainMenu
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# During instantiation, any settable option parameters
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# are passed as an object set to the module and the
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# options dictionary is automatically set. This is mostly
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# in case options are passed on the command line
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if params:
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for param in params:
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# parameter format is [Name, Value]
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option, value = param
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if option in self.options:
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self.options[option]['Value'] = value
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def generate(self):
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# if you're reading in a large, external script that might be updates,
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# use the pattern below
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# read in the common module source code
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moduleSource = self.mainMenu.installPath + "/data/module_source/exfil/Invoke-EgressCheck.ps1"
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try:
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f = open(moduleSource, 'r')
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except:
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print helpers.color("[!] Could not read module source path at: " + str(moduleSource))
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return ""
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moduleCode = f.read()
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f.close()
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script = moduleCode
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# Need to actually run the module that has been loaded
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script += 'Invoke-EgressCheck'
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# add any arguments to the end execution of the script
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for option,values in self.options.iteritems():
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if option.lower() != "agent":
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if values['Value'] and values['Value'] != '':
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if values['Value'].lower() == "true":
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# if we're just adding a switch
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script += " -" + str(option)
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else:
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script += " -" + str(option) + " \"" + str(values['Value']) + "\""
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return script
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