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134 lines
3.1 KiB
PowerShell
134 lines
3.1 KiB
PowerShell
<#
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Simulate-DNSTunnel.ps1
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Author: Mariusz Banach (@mgeeky)
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License: GPL
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Required Dependencies: None
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Optional Dependencies: None
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#>
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$MaxQueryLength = 253
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$MaxDnsLabelLength = 63
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# Although it can get even up to 127, keeping it lower value may seem more genuine
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$MaxNumberOfLevels = 5
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function Simulate-DNSTunnel
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{
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<#
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.SYNOPSIS
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Performs DNS Tunnelling simulation.
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.DESCRIPTION
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This function performs DNS tunelling simulation for purpose
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of triggering installed Network IPS and IDS systems. By issuing
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DNS queries over system's default resolver, will introduce peak
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in high-entropy anomalous queries to be picked up by blue teams.
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.PARAMETER Domain
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Domain to be queried against randomly generated anomalous-looking long subdomain.
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This domain should have a '*' type A record pointing to some IP address
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for every wildcard subdomain queried, to avoid subsequent DNS failures.
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Also, obviously the domain should be resolveable.
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.PARAMETER Interval
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This parameter introduces delay between subsequent queries (in seconds). When unset,
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every query will be triggered sequentially one after another. Otherwise,
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a sleep will be introduced between queries, simulating thus DNS beaconing.
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.PARAMETER QueriesNumber
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Number of DNS queries to perform. If unset, script will perform inifinite number
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of DNS queries. In such case, it can be terminated by CTRL+C.
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.EXAMPLE
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Simulate-DNSTunnel -Domain google.com
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#>
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[CmdletBinding()] Param(
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[String]
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$Domain,
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[Double]
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$Interval = 0.0,
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[Int]
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$QueriesNumber = 0
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)
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$Num = 0
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While ( ($Num -lt $QueriesNumber) -or ($QueriesNumber -eq 0))
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{
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$Num += 1
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$Query = Generate-AnomalousQuery -Domain $Domain
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If ($Interval -ne 0.0 )
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{
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Start-Sleep -m ($Interval * 1000)
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}
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Try
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{
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Write-Host "[+] $Num. Querying: $Query"
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[System.Net.Dns]::GetHostByName($Query).Hostname
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}
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Catch
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{
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}
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}
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}
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function Get-RandomString
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{
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[CmdletBinding()] Param(
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[int]
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$Count
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)
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return -join ((65..90) + (97..122) | Get-Random -Count $Count | %{[char]$_})
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}
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function Generate-AnomalousQuery
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{
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Param(
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[String]
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$Domain
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)
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$QueryToGenerateLen = (Get-Random) % ($MaxQueryLength - $Domain.Length - 1)
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$PartLen = [math]::Min($MaxDnsLabelLength, $QueryToGenerateLen)
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$NumberOfParts = (Get-Random) % $MaxNumberOfLevels
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$Query = ""
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For ($i = 0; $i -lt $NumberOfParts; $i++ )
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{
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$Query += Get-RandomString -Count ($PartLen / $NumberOfParts)
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$Query += "."
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}
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While ($Query.Length -lt $QueryToGenerateLen )
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{
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$Query += Get-RandomString -Count 1
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}
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If (($Query.Length + $Domain.Length) -ge ($MaxQueryLength + 1) )
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{
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$Query = $Query.Substring(0, $MaxQueryLength - $Domain.Length - 1)
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}
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$Query = $Query -replace "\.\.", "."
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$Query += ".$Domain"
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return $Query
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} |