Good Pranks

ChangeLastUser_1.0_2020_01_29.ps1

Read-Host "Last logged on user" | Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI" -Name "LastLoggedOnDisplayName" -Value $_

ChangeLastUser_1.1_2020_01_29.ps1

$scriptName = $MyInvocation.MyCommand.Name

#[TEST FOR LOGS DIR]#
$dir = "C:\Temp\Logs"
$dirTest = Test-Path -Path $dir
if (!($dirTest)) {
    New-Item -Path $dir -ItemType Directory
}

#[TEST FOR LOG FILE]#
$file = "C:\Temp\Logs\DisplayNameSet.txt"
$fileTest = Test-Path -Path $file
if (!($fileTest)) {
    New-Item -Force -Path $file -ItemType File
}
else {
    Clear-Content -Path $file
}

#[SET REGISTRY VALUE]#
function SetValue {
    param ($name)
    Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI" -Name "LastLoggedOnDisplayName" -Value $name
    Write-Host "Registry value set."
}

function IfYes ($open) {
    if ($open -eq "Yes") {
        notepad "C:\Temp\Logs\DisplayNameSet.txt"
    }
}

#[MAIN SCRIPT]#
& {
    #[TEST SCRIPT LOCATION]#
    $open = "No"
    $scriptProgFile = Test-Path "C:\Program Files\$scriptName"
    if (!($scriptProgFile)) {
        Write-Host "This script needs to be moved to C:\Program Files\"
        $open = "Yes"
    }

    #[TEST FOR SCHEDULED TASK]#
    #[CREATE IF NOT FOUND]#
    if (!(Get-ScheduledTask | Where-Object { $_.TaskName -eq "Prank"})) {
        $action = New-ScheduledTaskAction -Execute 'C:\Program Files\ChangeLastUser_1.1_2020_01_29.ps1'
        $trigger = New-ScheduledTaskTrigger -AtLogoff
        $STPrin = New-ScheduledTaskPrincipal -UserId "LOCALSERVICE" -LogonType ServiceAccount
        Register-ScheduledTask -Action $action -Trigger $trigger -TaskName "Prank" -Description "Sholtor4096 was here." -Principal $STPrin
        Write-Host "Scheduled Task Created"
        SetValue("boris@kremlin.gov.ru")
        IfYes($open)
    }
    
    #[IF FOUND SET VALUE]#
    else {
        Write-Host "Scheduled Task Exists"
        SetValue("boris@kremlin.gov.ru")
        IfYes($open)
    }
} *>> "C:\Temp\Logs\DisplayNameSet.txt"