This module checks a range of hosts for the MS12-020 vulnerability. This does not cause a DoS on the target.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/rdp/ms12_020_check
msf auxiliary(ms12_020_check) > show actions
...actions...
msf auxiliary(ms12_020_check) > set ACTION < action-name >
msf auxiliary(ms12_020_check) > show options
...show and set options...
msf auxiliary(ms12_020_check) > run
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