File: ftpd.rules

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sagan-rules 1:20170725-1
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# Sagan ftpd.rules
# Copyright (c) 2009-2017, Quadrant Information Security <www.quadrantsec.com>
# All rights reserved.
#
# Please submit any custom rules or ideas to sagan-submit@quadrantsec.com or the sagan-sigs mailing list
#
#*************************************************************
#  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
#  following conditions are met:
#
#  * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
#    disclaimer.
#  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
#    following disclaimer in the documentation and/or other materials provided with the distribution.
#  * Neither the name of the nor the names of its contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES,
#  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
#  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#*************************************************************

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] FTP Login refused"; content: "FTP LOGIN REFUSED"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: unsuccessful-user; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000182; sid:5000182; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] File created"; content: " created "; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000183; sid:5000183; rev:6;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] File deleted"; content: " deleted "; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000184; sid:5000184; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] User uploaded a file to server"; content: "IMPORT file"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000185; sid:5000185; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] User downloaded a file to server"; content: "EXPORT file"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000186; sid:5000186; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Remote host connected to FTP server"; pcre: "/FTP LOGIN FROM|connection from|connect from/"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: successful-user; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000187; sid:5000187; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Connection blocked by TCP Wrappers"; content: "refused connect from"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: tcp-connection; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000188; sid:5000188; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Reverse lookup failure"; pcre: "/can't verify hostname|gethostbyaddr/"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000189; sid:5000189; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Multiple failed login attempts"; content: "repeated login failures"; xbits: set,brute_force,21600; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: misc-attack; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000190; sid:5000190; rev:6;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] User disconnected due to time out"; content: "timed out after"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: not-suspicious; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000191; sid:5000191; rev:5;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Attempted access to a disabled account"; content: "Account is disabled"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: unsuccessful-user; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5000192; sid:5000192; rev:5;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Failed authentication"; content: "failed authentication from"; nocase; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: unsuccessful-user; program: ftpd|ftp|FTP|FTPD; reference: url,wiki.quadrantsec.com/bin/view/Main/5001522; sid:5001522; rev:5;)
drop any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Failed authentication - Brute force [5/5]"; content: "failed authentication from"; nocase; xbits: set,brute_force,21600; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: unsuccessful-user; program: ftpd|ftp|FTP|FTPD; after: track by_src, count 5, seconds 300; threshold: type limit, track by_src, count 1, seconds 300; fwsam: src, 1 day; reference: url,wiki.quadrantsec.com/bin/view/Main/5000193; sid:5000193; rev:9;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[FTPD] User logged into an disabled account"; content: "FTP LOGIN FROM"; pcre: "/ apachei | mysql | www | nobody | nogroup | portmap | named | rpc | mail | ftp | shutdown | halt | daemon | bin | postfix | shell | info | guest | psql | user | users | console | uucp | lp | sync | sshd | cdrom | ossec | sagan /"; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: successful-user; xbits: set,brute_force,21600; reference: url,wiki.quadrantsec.com/bin/view/Main/5000412; program: ftpd|ftp|FTP|FTPD; sid: 5000412; rev:7;)

# Rule by W. E Restrepo (werestrepo@quadrantsec.com) - 08/30/2016

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[FTPD] FTPCHK3 file accessed by user"; content: "ftpchk3"; pcre: "/CHMOD|DELE|STOR/i"; parse_src_ip: 2; parse_dst_ip: 1; parse_port; program: ftp|ftpd|FTP|FTPD; default_prot: tcp; default_dst_port: $FTP_PORT: classtype: suspicious-traffic; reference: url,wiki.quadrantsec.com/bin/view/Main/5002950; reference: url,blog.ftptoday.com/ftp-password-stealing-malware; sid:5002950; rev: 3;)