This will help to track down failed logins. This could be due to someone changing their password and still are logged in to a server with the old account information. The other side is that someone could be trying to brute force an account.
Type=”Failure Audit” sourcetype=”WinEventLog:Security” | chart count by User_Name | sort – count
So I am a full convert and profit of Splunk now. I have been using it at work for around 4 months now. I have rolled it out to our domain controllers and have started rolling it to all our Windows and *nix servers. The ability to find out who did what has made my job so much easier. There was an incident where an OU was deleted in our AD. I was able to see exactly who and when did it. Normally this type of searching wasn’t possible or at least hard to get due to the size of our infrastructure. Our Event Logs roll over around once an hour. The OU was deleted 8 hours before we were contacted.
Here is a few of the reports I have scheduled to get every morning to take a look at what has happened in my environment.
User Accounts deleted:
EventCode=”630″ | fields Caller_User_Name, Target_Domain, Target_Account_Name, host | collect | rename Caller_User_Name as Who_Did_It | rename Target_Account_Name as Deleted_Account | rename host as DomainController | rename Target_Domain as Users_Domain
User Accounts created:
EventCode=”624″ | fields Caller_User_Name, New_Domain, New_Account_Name, host | collect | rename Caller_User_Name as Who_Did_It | rename Target_Account_Name as Modified_Account | rename host as DomainController | rename New_Domain as New_Account_Domain
Computer Accounts deleted:
EventCode=”647″ | fields Caller_User_Name, Target_Domain, Target_Account_Name, host | collect | rename Caller_User_Name as Who_Did_It | rename Target_Account_Name as Deleted_Computer | rename host as DomainController | rename Target_Domain as Removed_Domain
Computer Accounts created:
EventCode=”645″ | fields Caller_User_Name, New_Domain, New_Account_Name, host | collect | rename Caller_User_Name as Who_Did_It | rename New_Account_Name as New_Computer | rename host as DomainController | rename New_Domain as Joined_Domain