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CVE-2013-0074.lua
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CVE-2013-0074.lua
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--[[
#*************************************************************
# Copyright (c) 2003-2013, Emerging Threats
# All rights reserved.
#
# 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.
#
#*************************************************************
Detection for suspicious Silverlight files requires lua zip module.
sudo apt-get install liblua5.1-zip-dev
This lua script can be run standalone and verbosely on a Silverlight file with
echo "run()" | lua -i <script name> <Silverlight Package>
Chris Wakelin
Will Metcalf
--]]
require("zip")
-- {strings to match, number of matching strings needed, simple strings, description}
susp_class = {
{"WriteableBitmap","get_PixelWidth","get_PixelHeight","SetSource","\137\080\078\071\013\010\026\010\000\000\000\013\073\072\068\082\000\000\000\008\000\000\000\004\008\003\000\000\000\132\019\142\194",5,true,"CVE-2013-0074 VariousEK's",0},
{"F:\\EXP\\",".pdb",2,true,"CVE-2013-0074 Nuclear",0},
{"d%z?r%z?o%z?p%z?B%z?o%z?m%z?b","W%z?S%z?c%z?r%z?i%z?p%z?t%z?%.%z?S%z?h%z?e%z?l%z?l",1,false,"CVE-2013-0074 Unknown 18cbe962a6d290543d47a51a0837d7bb",0},
{"XPerTu x64 productions 2009","Object","System.Windows.Browser","AesManaged",4,true,"CVE-2013-0074 AnglerEK",0},
{"\009\032\069\071\071\033\158",1,true,"Magnitude EK",0},
{"GetChars","GetDecoder","GetCharCount","ExecPayload","Shell32","Shell64","Assembly","System.Text",8,true,"CVE-2016-0034",0}
}
obfus_strings = {
}
function init (args)
local needs = {}
needs["http.response_body"] = tostring(true)
return needs
end
function match_strings(a,match_set,verbose)
local rtn = 0
local n,m
local num_strings = #match_set - 4
local match_num = match_set[num_strings+1]
local plain = match_set[num_strings+2]
local desc = match_set[num_strings+3]
local fnd
for n = 1, num_strings, 1 do
m = match_set[n]
if m ~= 0 then
fnd = string.find(a,m,1,plain)
if fnd then
match_set[num_strings+4] = match_set[num_strings+4] + 1
if verbose == 1 then print("Found String " .. m .. " " .. match_set[num_strings+4] .. " of " .. match_num) end
--match_set[num_strings+4] is our counter
if match_set[num_strings+4] == match_num then
if verbose == 1 then print("Found " .. desc) end
match_set[n] = 0
rtn = 1
break
else
--Found lets zero it out so we don't check again
match_set[n] = 0
end
end
end
end
return rtn
end
function common(t,verbose)
rtn = 0
-- tmpfs setup should be faster
-- mkdir -p /home/suricata/scratch && sudo mount -t tmpfs -o size=1G,mode=0700 tmpfs /home/suricata/scratch && sudo chown suricata:suricata /home/suricata/scratch/
-- tmpname = "/home/suricata/scratch/eviljars." .. tostring(os.time()) .. "." .. tostring(math.random(2000000,9000000))
tmpname = os.tmpname()
tmp = io.open(tmpname,'w')
tmp:write(t)
tmp:close()
z = zip.open(tmpname)
if z then
for w in z:files() do
f = z:open(w.filename);
u = f:read("*all")
f:close()
if (verbose==1) then print("Checking " .. w.filename) end
if (string.sub(u,1,2) == "MZ") then
for l,s in pairs(susp_class) do
if (verbose==1) then print("Looking for " .. s[#s-1] .. " in ".. w.filename) end
if match_strings(u,s,verbose) == 1 then
rtn = 1
if (verbose == 0) then
break
end
end
end
end
end
z:close()
end
os.remove(tmpname)
return rtn
end
-- return match via table
function match(args)
local t = tostring(args["http.response_body"])
return common(t,0)
end
function run()
local f = io.open(arg[1])
local t = f:read("*all")
f:close()
if common(t,1) == 1 then print("Found Suspicious String in " .. arg[1]) end
end