docs: Add better documentation for powershell remoting exploiter

docs/content/reference/exploiters/powershell.md

@@ -4,7 +4,54 @@ date: 2021-08-24T12:19:21+03:00
 draft: false
 tags: ["exploit", "windows"]
 ---
+
 ### Description
 
-PowerShell Remoting exploit brute forces machines via WinRM service using credentials provided by the user
-(see ["configuration"]({{< ref "/usage/configuration" >}}) for instructions) .
+PowerShell Remoting is a brute-force exploit that uses PowerShell Remoting Protocol (PSRP) and
+Windows Remote Management(WinRM) services to propagate to a victim.
+
+### PowerShell Remoting Protocol
+
+PowerShell Remoting Protocol uses Windows Remote Management service, which is Microsoft implementation of Web Services
+for Management (WS-Management) protocol, to allow users to run PowerShell commands on remote computers.
+
+PowerShell Remoting and WinRM listens on the following ports:
+1. HTTP: 5895
+2. HTTPS: 5896
+
+By default, PowerShell Remoting only allows connections from members of the Administrators group. Sessions are launched
+under the user's context, so all operating system access controls applied to individual users and groups continue to apply
+to them while connected over PowerShell Remoting.
+
+On private networks, the default Windows Firewall rule for PowerShell Remoting accepts all connections. On public networks,
+the default Windows Firewall rule allows PowerShell Remoting connections only from within the same subnet. You have to
+explicitly change that rule to open PowerShell Remoting to all connections on a public network.
+
+More on [PowerShell Remoting Protocol]("https://docs.microsoft.com/en-us/powershell/scripting/learn/remoting/winrmsecurity?view=powershell-7.1").
+
+### Windows Remote Management
+
+Windows Remote Management (WinRM) is the Microsoft implementation of WS-Management Protocol, a standard Simple Object
+Access Protocol (SOAP)-based, firewall-friendly protocol that allows hardware and operating systems, from different
+vendors, to interoperate.
+
+More on [Windows Remote Management]("https://docs.microsoft.com/en-us/windows/win32/winrm/portal").
+
+### Implementation
+
+The exploit brute forces the credentials of PSRP with every possible combination of username and password that
+the user provides (see ["configuration"]({{< ref "/usage/configuration" >}})).
+
+#### Credentials list
+
+The PowerShell Remoting Client has ability to use the cached username or/and password from the system we are currently
+log in. That means that the exploiter uses the following combination of credentials to propagate to the victim in the order written:
+
+1. Username = None and Password = None; which means that the client we use is going to take the stored credentials
+from the system we are using to connect. In order for the user to connect without entering username and password
+the victim must have enabled basic authentication, http and no encryption on the victim machine.
+
+2. Username list of usernames and Password = None; brute-force with different usernames and None as
+password which means that we use the cached one from the system.
+
+3. List of usernames and passwords as plain-text entered by the user.