Excessive Windows File Modification
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About the rule
Rule Type
Anomaly
Rule Description
Monitors high volume file edits indicating ransomware or data exfiltration activity.
Severity
Critical
Rule Requirement
Criteria
Action1:
actionname = "File Created or Modified"
| isanomalous(User at an unusual Time)
| isanomalous(User with abnormal Count)
| isanomalous(Log source at an unusual Time)
| isanomalous(Log source with abnormal Count)
| isanomalous(Log source with unusual Username)
select Action1.HOSTNAME,Action1.MESSAGE,Action1.USERNAME,Action1.DOMAIN,Action1.OBJECTNAME,Action1.FILENAME,Action1.PROCESSNAME,Action1.FILETYPE
Detection
Execution Mode
Intelligent
Log Sources
Windows
