2 Replies Latest reply on Nov 2, 2015 7:00 PM by minsktractorworks

    Using Regex or Wildcards in Watchlists

    minsktractorworks

      I'm trying to get a match on the "Object" field from our reverse proxy servers when any of the following show up:

       

      wp-login.php

      wp-login.php?registration=disabled

      wp-login.php?action=register

       

      I want to use a watchlist within a correlation rule but they seem to only match exact strings, I'd like to be able to simply add wp-login.php to match any string containing it rather than having to add every variation to the watchlist. Is there anyway to use wildcards/contains()/regex within a watchlist?

        • 1. Re: Using Regex or Wildcards in Watchlists
          rorik.koster

          I haven't had much success tackling that issue with watchlists as you have described.

           

          If you're not paranoid about missing matches (on new events) you could try populating a dynamic watchlist type of "ESM Strings" that updates every couple of minutes.  Your search string would simply be "wp-login".  When you select "Run Now" to populate the initial watchlist you will likely retrieve all of the values to match against since it's pulling strings from events that ESM has in memory.

           

          An alternate approach is to modify the parser to match the URI before the ? and then match the URI after the ? and store those in two different fields (custom fields of type string named 'base' and 'uri').  For example:

           

          Event 1

          object: /wp-login.php

          base: wp-login.php

          uri: -


          Event 2

          object: /wp-login.php?registration=disabled

          base: wp-login.php

          uri:registration=disabled


          Event 3

          object: /wp-login.php?action=register

          base: wp-login.php

          uri: action=register

           

          When the data is parsed like this your watchlist of 'wp-login.php' should work as you expect it to within your correlation rule.

           

          Hope this is helpful!

           

          Thanks,

          Rorik

          • 2. Re: Using Regex or Wildcards in Watchlists
            minsktractorworks

            Hey Rorik,

             

            Great idea on the additional parsing option, will try that out this week.

             

            I've played around with the dynamic watchlist but doesn't work for all fields, it works in this example, but not for subject lines within email events.

             

            It would be great if you could use a watchlist combined with a contain within a correlation rule.

             

            Cheers