This is for January 1999.

      10
             34%
                 Probes
       9
             31%
                 Other successful attack
       8
             27%
                 Break-in
       7
             24%
                 Unknown
       7
             24%
                 Root compromise
       6
             20%
                 Known unsuccessful attack
       5
             17%
                 Information request
       3
             10%
                 Compromised account
       3
             10%
                 Trojan Horse
       3
             10%
                 Denial of service
       2
              6%
                 Virus
       2
              6%
                 Web abuse
       2
              6%
                 Password Cracking
       2
              6%
                 Vulnerability exploited
       1
              3%
                 Port Scan
       1
              3%
                 Mail Spoofing
       1
              3%
                 Break-in Attempt
       1
              3%
                 Social Engineering
       1
              3%
                 Anonymous FTP abuse
       1
              3%
                 Sniffer
       1
              3%
                 Login Attempts
       1
              3%
                 Configuration Error
       1
              3%
                 Widespread Scan
       1
              3%
                 Mail Spamming