From OSSEC Wiki
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Log Samples from xferlog (by default at /var/log/xferlog)
The xferlog file contains logging information from the FTP server daemon, ftpd. This file usually is found at /var/log/xferlog, but can be anywhere else.
Each server entry is composed of a single line
of the following form, with all fields being separated by
spaces.
current-time transfer-time remote-host file-size filename transfer-type special-action-flag direction access-mode username serĀvice-name authentication-method authenticated-user-id completion-status
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Samples
Thu Sep 2 09:52:00 2004 50 192.168.20.10 896242 /home/test/file1.tgz b _ o r suporte ftp 0 * c
Thu Sep 2 09:57:16 2004 289 192.168.20.10 8045867 /home/test2.tgz b _ o r suporte ftp 0 * c