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Get-NewlyInstalledService.ps1
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Get-NewlyInstalledService.ps1
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<#
.SYNOPSIS
Get-NewlyInstalledService is for identifying a when an unusual service is being run possibly indicating credentials were compromised.
.DESCRIPTION
This is best used as a task that runs in response to event ID 7009 and 7045. The 2 newest events will be sent to the admins as an alert.
.NOTES
Author: Rob Osborne
Alias: tobor
Contact: [email protected]
.LINK
https://osbornepro.com
https://writeups.osbornepro.com
https://github.com/tobor88
https://gitlab.com/tobor88
https://www.powershellgallery.com/profiles/tobor
https://www.linkedin.com/in/roberthosborne/
https://www.credly.com/users/roberthosborne/badges
https://www.hackthebox.eu/profile/52286
.EXAMPLE
Get-NewlyInstalledService -SmtpServer mail.smtp2go.com -To [email protected] -From [email protected] -Verbose
This examples sends the alert to [email protected] from the smtp2go server.
#>
Function Get-NewlyInstalledService {
[CmdletBinding()]
param(
[Parameter(Mandatory=$True,
Position=0,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True,
HelpMessage="Enter an SMTP Server to use. Example: mail.smtp2go.com")]
[string]$SmtpServer,
[Parameter(Mandatory=$True,
Position=1,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True,
HelpMessage="Enter an email address to send the alert to. Example: [email protected]")]
[string]$To,
[Parameter(Mandatory=$True,
Position=2,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True,
HelpMessage="Enter an email address to send the alert from. Example: [email protected]")]
[string]$From
)# End param
BEGIN
{
Write-Verbose "Pulling events in question"
$EventInfo = Get-WinEvent -FilterHashtable @{Logname="System"; ID = 7009,7045} -MaxEvents 2
} # End BEGIN
PROCESS
{
Write-Verbose "Converting event into HTML viewable format"
Write-Verbose "If Event is not relating to Windows Defender Updates then this will continue"
If (!($EventInfo | Where-Object {$_.Message -like "*Service File Name: C:\ProgramData\Microsoft\Windows Defender\Definition Updates\*"}))
{
$Css = @"
<style>
table {
font-family: verdana,arial,sans-serif;
font-size:11px;
color:#333333;
border-width: 1px;
border-color: #666666;
border-collapse: collapse;
}
th {
border-width: 1px;
padding: 8px;
border-style: solid;
border-color: #666666;
background-color: #dedede;
}
td {
border-width: 1px;
padding: 8px;
border-style: solid;
border-color: #666666;
background-color: #ffffff;
}
</style>
"@
Write-Verbose "Building email's mail body..."
$TableInfo = $EventInfo | Select-Object -Property TimeCreated, ProcessId, UserId, MachineName, Message
$PreContent = "<Title>MITM Monitoring Alert: Watches for Newly Installed Services</Title>"
$NoteLine = "$(Get-Date -format 'MM/dd/yyyy HH:mm:ss')"
$PostContent = "<br><p><font size='2'><i>$NoteLine</i></font>"
$MailBody = $TableInfo | ConvertTo-Html -Head $Css -PostContent $PostContent -PreContent $PreContent -Body "If you see BTOBTO, Base64 encoded service names, or random characters for a services name the attacker has SYSTEM PRIVILEDGE. This also means ADMIN CREDENTIALS HAVE most likely BEEN COMPROMISED." | Out-String
Write-Verbose "Creating email body and placing info into a neat looking table"
Send-MailMessage -From $From -To $To -Subject "$env:COMPUTERNAME Had New Service Installed" -BodyAsHtml -Body $MailBody -SmtpServer $SmtpServer
} # End If
} # End PROCESS
} # End Function Get-NewlyInstalledService
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# SIG # End signature block