Brute force on admin account - Windows Domain

Question

Hello,
I have seen a rise of attempts to brute force our Administrator account on a awindows domain. I have in place, a Cisco ASA5505 w/ IPS sensor. I'd like to use the IPS sensor to automatically block IP's that brute force after x failed login attempts.
Question is, is there a signature present (we auto update and are current) which will detect this and, what do we need to do to enable / configure this to kill the connection and deny further attempts.
THIS is what I need to stop: We are getting a few hundred a day.
Logon Failure:
       Reason:            Unknown user name or bad password
       User Name:      administrator
       Domain:            xxx
       Logon Type:      10
       Logon Process:      User32 
       Authentication Package:      Negotiate
       Workstation Name:      xxx
       Caller User Name:      xxx
       Caller Domain:      xxx
       Caller Logon ID:      (0x0,0x3E7)
       Caller Process ID:      8728
       Transited Services:      -
       Source Network Address:      213.171.220.184
       Source Port:      9674

Answer 1

Hello
To my knowledge there is no such signature,you need to create a custom signature to achive this.
If you have Cisco MARS; you can pull these events directly in MARS and create a regex rule for the same. Add email notification to this rule as usual to ensure alerting as desired.  Windows events can either be pulled  by MARS or can be pushed using the Snare agent.
Please see this link for more details:
http://www.cisco.com/en/US/docs/security/security_management/cs-mars/6.0/device/configuration/guide/cfgHost.html#wp718623
Regards
Farrukh