/etc/fail2ban/filter.d/sshd-ddos.conf is in fail2ban 0.8.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | # Fail2Ban ssh filter for at attempted exploit
#
# The regex here also relates to a exploit:
#
# http://www.securityfocus.com/bid/17958/exploit
# The example code here shows the pushing of the exploit straight after
# reading the server version. This is where the client version string normally
# pushed. As such the server will read this unparsible information as
# "Did not receive identification string".
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf
[Definition]
_daemon = sshd
failregex = ^%(__prefix_line)sDid not receive identification string from <HOST>\s*$
ignoreregex =
# Author: Yaroslav Halchenko
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