net use

In Microsoft operating-systems like DOS and Windows, the net use command (a sub-command of the net command) has several network-related functions allowing configuration from the command-line.

Drive mapping

net use can control drive mapping: mounting ("mapping" in Microsoft terminology) drive shares in a network environment. This command makes use of the SMB (server message block) and the Netbios protocol on port 139 or 445. The basic Windows XP configuration enables this functionality by default. Thus users can connect to and disconnect from shared resources such as computers, printers and drives.

net use can display a list of network-connection information on shared resources.

Null session connections

net use also connects to the IPC$ (interprocess communication share). This is the so-called null session connection, which allows unauthenticated users. The basic syntax for connecting anonymously is:

net use \\IP address\IPC$ "" /u:""

For example, typing at the command prompt:

net use \\192.168.1.101\IPC$ "" /u:""

attempts to connect to the share IPC$ of the network 192.168.1.101 as an anonymous user with blank password. If successfully connected to the target machine, a lot of information can be gathered such as shares, users, groups, registry keys and more. This would provide a hacker with a lot of information about a remote user.

References

For more information about net use for connecting and disconnecting from network shares, refer to:

Windows command-line programs and shell builtins

COMMAND.COM Command Prompt Windows PowerShell Recovery Console

File system navigation	cd (chdir) dir popd pushd tree

File management	attrib cacls cipher compact copy del (erase) deltree expand icacls makecab md (mkdir) move rd (rmdir) recover ren (rename) replace rmdir robocopy xcopy

Disk management	chkdsk convert defrag diskcomp diskcopy diskpart fdisk format label subst scandisk sys vol vssadmin

Processes	exit kill powercfg runas sc shutdown start taskkill tasklist

Registry	assoc ftype reg regini regsvr32

User environment	date mode path set setx time title ver whoami

File contents	comp edit edlin fc find findstr print type

Scripting	choice clip cscript doskey echo for goto if more pause prompt rem

Networking	arp getmac hostname ipconfig net use netsh netstat nslookup PathPing ping route tracert

Maintenance and care	driverquery msiexec ntbackup sfc systeminfo w32tm WBAdmin winsat wmic

Boot management	bcdedit bootcfg fixboot fixmbr

Software development	debug exe2bin QBasic

Miscellaneous	cls help

List of DOS commands Environment variables

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