The following Splunk search query will return results for failed login attempts in a Linux environment for a specified time range. The regular expressions are defined within the search string, however if you already extracted the necessary fields you can ignore the regex section. sourcetype=linux_secure | eval Date=strftime(_time, “%Y/%m/%d”) | rex “.*:\d{2}\s(?<hostname>\S+)” | rex […]
Failed Logins Windows
Splunk query for all failed logon attempts within a windows environment. sourcetype=”WinEventLog:Security” (“EventCode=4625”) OR (“EventCode=529” OR “EventCode=530” OR “EventCode=531” OR “EventCode=532” OR “EventCode=533” OR “EventCode=534” OR “EventCode=535” OR “EventCode=536” OR “EventCode=537” OR “EventCode=539”)
