Provided by: chkrootkit_0.49-4.1ubuntu1_amd64
chkwtmp - check wtmp-file for deleted entries
Chkwtmp examines the file /var/log/wtmp for entries with no information (containing only null-bytes). If such entries are found the program prints the time window for the original entry. This is done by displaying the timestamps of the wtmp-entry before and after the deleted entry. To run chkwtmp you need read permission on the file /var/log/wtmp. Normally this file is world-readable and no special privileges are required to run the checker.
/var/log/wtmp login data base
An entry is recognized as overwritten if the time-information has been overwritten with null-bytes. This program was designed to run on SunOS 4.x systems only. On other systems the output is undefined...