Ataque brute force


/var/log/auth.log:

Mar 29 23:43:03 melix sshd[4969]: Illegal user a from ::ffff:65.111.176.210
Mar 29 23:43:03 melix sshd[4967]: error: Could not get shadow information for NOUSER
Mar 29 23:43:03 melix sshd[4967]: Failed password for illegal user a from ::ffff:65.111.176.210 port 38836 ssh2
Mar 29 23:43:04 melix sshd[4969]: Illegal user b from ::ffff:65.111.176.210
Mar 29 23:43:04 melix sshd[4969]: error: Could not get shadow information for NOUSER
Mar 29 23:43:04 melix sshd[4969]: Failed password for illegal user b from ::ffff:65.111.176.210 port 39101 ssh2

Mar 30 01:28:43 melix sshd[5545]: Failed password for root from ::ffff:61.133.95.228 port 52366 ssh2
Mar 30 01:28:48 melix sshd[5547]: Illegal user admin from ::ffff:61.133.95.228
Mar 30 01:28:48 melix sshd[5547]: error: Could not get shadow information for NOUSER
Mar 30 01:28:48 melix sshd[5547]: Failed password for illegal user admin from ::ffff:61.133.95.228 port 52928 ssh2

Mar 30 01:45:07 melix sshd[5657]: Illegal user staff from ::ffff:200.11.75.91
Mar 30 01:45:07 melix sshd[5657]: error: Could not get shadow information for NOUSER
Mar 30 01:45:07 melix sshd[5657]: Failed password for illegal user staff from ::ffff:200.11.75.91 port 49664 ssh2
Mar 30 01:45:10 melix sshd[5659]: Illegal user sales from ::ffff:200.11.75.91
Mar 30 01:45:10 melix sshd[5659]: error: Could not get shadow information for NOUSER
Mar 30 01:45:10 melix sshd[5659]: Failed password for illegal user sales from ::ffff:200.11.75.91 port 49751