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Anomaly detection systems monitor stream of messages or network packets, looking for any deviation from "normal" or "baseline" behavior that may indicate a security threat or a misconfiguration.
The anomaly detection classifies syslog messages into two mail classes:
Reporting can be in the form of an email for each anomalous log, or an email for all the logs sent within a pre-defined time window. Anomaly based syslog analyzer can also execute commands, or simply write all anomalies to a file for periodical review.
Currently there are several free anomaly based log analyzers implementations written in Perl:
There are several ways to "normalize" syslog messages to make anomaly detection more efficient.
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Last modified: March 12, 2019