# ---------------------------------------------------------------
# Core ModSecurity Rule Set
# Copyright (C) 2006 Breach Security Inc. All rights reserved.
#
# The ModSecuirty Core Rule Set is distributed under GPL version 2
# Please see the enclosed LICENCE file for full details.
# ---------------------------------------------------------------


# The trojan access detection rules detects access to known Trojans already 
# installed on a server. Uploading of Trojans is part of the Anti-Virus rules 
# and uses external Anti Virus program when uploading files.
#
# Detection of Trojans access is especially important in a hosting environment
# where the actual Trojan upload may be done through valid methods and not
# through hacking.
# --
# 
# NOTE Trojans detection is based on checking elements controlled by the client. 
#      A determined attacked can bypass those checks. We are working on 
#      enchaining the checks so it would require a major change in the Trojan
#      to overcome.
#      
# NOTE We found out that Trojan horses are not detected easily by Anti-Virus 
#      software when uploading as the signature set of AV software is not tuned
#      for this purpose. We are working on adding signature tuned to detect
#      Trojans upload to file uploading inspection. 
# 

SecDefaultAction "log,pass,phase:2,t:lowercase,status:404"

SecRule REQUEST_HEADERS_NAMES "x_(?:key|file)\b" "ctl:auditLogParts=+E,deny,log,auditlog,status:404,msg:'Backdoor access',id:'950110',severity:'2'"
SecRule REQUEST_FILENAME "root\.exe" \
        "t:urlDecodeUni,t:htmlEntityDecode,ctl:auditLogParts=+E,deny,log,auditlog,status:404,msg:'Backdoor access',id:'950921',severity:'2'"
SecRule RESPONSE_BODY "(?:<title>[^<]*?(?:\b(?:(?:c(?:ehennemden|gi-telnet)|gamma web shell)\b|imhabirligi phpftp)|(?:r(?:emote explorer|57shell)|aventis klasvayv|zehir)\b|\.::(?:news remote php shell injection::\.| rhtools\b)|ph(?:p(?:(?: commander|-terminal)\b|remoteview)|vayv)|myshell)|\b(?:(?:(?:microsoft windows\b.{,10}\bversion\b.{,20}(c) copyright 1985-.{,10}\bmicrosoft corp|ntdaddy v1\.9 - obzerve \| fux0r inc)\.|(?:www\.sanalteror\.org - indexer and read|haxplor)er|php(?:konsole| shell)|c99shell)\b|aventgrup\.<br>|drwxr))" \
        "phase:4,ctl:auditLogParts=+E,deny,log,auditlog,status:404,msg:'Backdoor access',id:'950922',severity:'2'"
