File: pure-ftpd.rules

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# Sagan pure-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:"[PUREFTPD] New FTP connection"; content: "[INFO] New connection from"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: not-suspicious; program: pure-ftpd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000216; sid: 5000216; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[PUREFTPD] Authentication failed"; content: "[WARNING] Authentication failed for user"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: unsuccessful-user; program: pure-ftpd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000217; sid: 5000217; rev:3;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[PUREFTPD] FTP user logout or timeout"; pcre: "/[INFO] Logout|[INFO] Timeout/"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: not-suspicious; program: pure-ftpd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000219; sid: 5000219; rev:3;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[PUREFTPD] FTP notice message"; content: "[NOTICE]"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: program-error; program: pure-ftpd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000220; sid: 5000220; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[PUREFTPD] Attempting to access invalid directory"; content: "[INFO] Can't change directory to"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: suspicious-filename-detect; program: pure-ftpd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000221; sid: 5000221; rev:3;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[PUREFTPD] FTP Authentication successful"; pcre: "/[INFO] \S+ is now logged in/"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: successful-user; program: pure-ftpd; reference : url,wiki.quadrantsec.com/bin/view/Main/5000222; sid: 5000222; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[PUREFTPD] User logged into an disabled account"; pcre: "/[INFO] \S+ is now logged in/";; pcre: "/^apache$|^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_proto: tcp; default_dst_port: $FTP_PORT; classtype: successful-user; reference: url,wiki.quadrantsec.com/bin/view/Main/5000414; program: sshd; sid: 5000414; rev:3;)

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

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[PUREFTPD] FTPCHK3 file accessed by user"; content: "ftpchk3"; pcre: "/CHMOD|DELE|STOR/i"; program: pure-ftpd; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: suspicious-traffic; reference: url,blog.ftptoday.com/ftp-password-stealing-malware; reference: url,wiki.quadrantsec.com/bin/view/Main/5002952; sid:5002952; rev:3;)