Brute Force
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About the rule
Rule Type
Advanced
Rule Description
Detects many authentication failures from one source to one destination which is may indicate Brute Force activity
Severity
Critical
Rule Requirement
Criteria
Action1:
actionname = "Failed logon"
| timewindow 2m
| groupby HOSTTYPE
| groupby HOSTNAME having COUNT >= 10
Action2:
actionname = "Successful logon" AND HOSTTYPE = Action1.HOSTTYPE AND HOSTNAME = Action1.HOSTNAME
sequence:Action1 followedby Action2 within 1m
select Action1.timewindow.MESSAGE,Action1.timewindow.HOSTTYPE,Action1.timewindow.HOSTNAME,Action1.timewindow.REMOTEHOST,Action1.timewindow.USERNAME,Action2.MESSAGE,Action2.HOSTTYPE,Action2.HOSTNAME,Action2.REMOTEHOST,Action2.USERNAME
Detection
Execution Mode
realtime
Log Sources
Miscellaneous
Author
Aleksandr Akhremchik, oscd.community
