external account unsuccessful attempts to authenticate to multiple hosts

[jshael]

Any help figuring out how to design a query for this would be helpful.

[woodcock]

something like this:

index="YouShouldAlwaysSpecifyAnIndex" AND sourcetype="AndSourcetypeToo" AND other stuff here
| streamstats time_window=?? count dc(dest) AS dc BY host
| where count>?? AND dc>??

[richgalloway]

Install the Splunk Security Essentials app and check out the Brute Force Access Attempt Detected use cases.