Logcheck parses system logs and generates email reports based on anomalies. Anomalies can be defined by users with ‘violations’ files. It differentiates between ‘Active System Attacks’, ‘Security Violations’, and ‘Unusual Activity’, and is smart enough to remember where in the log it stopped processing to improve efficiency. It can also warn when log files shrink, and does not report errors when they are rotated.
You can download it from the following link: https://packetstormsecurity.com/files/download/37853/logcheck_1.2.40.tar.gz
Source: https://packetstormsecurity.com/files/37853/logcheck_1.2.40.tar.gz.html