Unusually Bulk Emails Sent to a Single Recipient
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About the rule
Rule Type
Anomaly
Rule Description
Detects mass emailing to a single address, possibly indicating misuse or spam.
Severity
Attention
Rule Requirement
Criteria
Action1: actionname = "DETECTION_ACTION_M365_MAIL_SUCCESSFULLY_DELIVERED" AND (username = "Administrator") | isanomalous(User at an unusual Time) | isanomalous(User with abnormal Count) select Action1.CALLER,Action1.TARGET,Action1.SOURCE_IPV6,Action1.DESTINATION_IPV6,Action1.HITS,Action1.RESULT
Detection
Execution Mode
Intelligent
Log Sources
Microsoft 365
