nxc-mssql: add page

pages/common/nxc-mssql.md

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+# nxc mssql
+
+> Pentest and exploit Microsoft SQL servers.
+> More information: <https://www.netexec.wiki/mssql-protocol>.
+
+- Search for valid credentials by trying out every combination in the specified lists of [u]sernames and [p]asswords:
+
+`nxc mssql {{192.168.178.2}} -u {{path/to/usernames.txt}} -p {{path/to/passwords.txt}}`
+
+- Execute the specified SQL [q]uery on the target server:
+
+`nxc mssql {{192.168.178.2}} -u {{username}} -p {{password}} --query '{{SELECT * FROM sys.databases;}}'`
+
+- Execute the specified shell command on the target server through MSSQL:
+
+`nxc mssql {{192.168.178.2}} -u {{username}} -p {{password}} -x {{whoami}}`
+
+- Execute the specified PowerShell command on the target server through MSSQL without retrieving output:
+
+`nxc mssql {{192.168.178.2}} -u {{username}} -p {{password}} -X {{whoami}} --no-output`
+
+- Download a remote file from the target server and store it in the specified location:
+
+`nxc mssql {{192.168.178.2}} -u {{username}} -p {{password}} --get-file {{C:\path\to\remote_file}} {{path/to/local_file}}`
+
+- Upload a local file to the specified location on the target server:
+
+`nxc mssql {{192.168.178.2}} -u {{username}} -p {{password}} --put-file {{path/to/local_file}} {{C:\path\to\remote_file}}`