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jsunpackn.py
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#!/usr/bin/python
'''
Jsunpackn - A generic JavaScript Unpacker Network Edition
Copyright (C) 2010 Blake Hartstein
http://jsunpack.jeek.org/
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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
'''
#See included INSTALL file for installation instructions
#See included CHANGELOG file for features
from hashlib import sha1
from optparse import OptionParser
from os import makedirs
from os.path import isdir, abspath, dirname
from urlattr import *
import ConfigParser
import StringIO
import detection
import gzip
import html
import pdf
import random
import signal
import socket
import struct
import subprocess
import swf
import sys
import time
import urllib2
try:
import magic #optional
ms = magic.open(magic.MAGIC_NONE)
ms.load()
ENABLE_MAGIC = True
except:
ENABLE_MAGIC = False
try:
import nids #optional
end_states = (nids.NIDS_CLOSE, nids.NIDS_TIMEOUT, nids.NIDS_RESET)
ENABLE_NIDS = True
except ImportError:
ENABLE_NIDS = False
class jsunpack:
version = "0.3.2c (beta)"
defaultReferer = 'www.google.com/trends/hottrends' #used by active fetching only
ips = []
def __init__(self, _start, todecode, options, prevRooturl={}) :
'''
INPUT: These are the main input modes:
1) options.urlfetch: URL to fetch and decode (if options.active, then follow up)
OR
2) todecode: local contents or static string as:
todecode[0]=url_or_name(optional)
todecode[1]=data(mandatory)
todecode[2]=filename
OUTPUT: check the <jsunpack Object>.rooturl structure. To decode multiple files and not create separate trees,
passing rooturl between different decodings is necessary (as prevRooturl).
parameters:
@_start = url of root node
@options = configuration and user settings; includes rules as strings (not filenames)
@prevRooturl = continuity of tree between decodings, after decoding pass in <jsunpack Object>.rooturl
'''
global ENABLE_NIDS
self.start = canonicalize(_start) #start is the root node in the tree, do not destroy it
self.rooturl = prevRooturl #this dict contains all information about decodings, continuity between decodings
[myurl, mydata, myfile] = todecode
self.url = myurl
self.forceStreams = False #keep data in streams{} in case we don't end in one of the end_states
self.streams = {}
self.seen = {} #dictionary to avoid repeating information (addressed by unique url)
#detection:
#self.exploits = [] #legacy
self.SIGS = detection.rules(options.rules)
self.SIGSalt = detection.rules(options.rulesAscii)
#options and attributes:
self.OPTIONS = options #configuration and user options
self.lastModified = '' #http_header lastModified
self.binExists = False
if self.OPTIONS.veryverbose:
self.OPTIONS.verbose = True
if self.OPTIONS.verbose:
urlattr.verbose = True
self.OPTIONS.outdir = self.replaceCurrentDate(self.OPTIONS.outdir)
self.OPTIONS.tmpdir = self.replaceCurrentDate(self.OPTIONS.tmpdir)
if not hasattr(self.OPTIONS, 'log_ips'):
self.OPTIONS.log_ips = ''
self.OPTIONS.log_ips = self.replaceCurrentDate(self.OPTIONS.log_ips)
if not hasattr(self.OPTIONS, 'decoded'):
self.OPTIONS.decoded = ''
self.OPTIONS.decoded = self.replaceCurrentDate(self.OPTIONS.decoded)
self.hparser = html.Parser(self.OPTIONS.htmlparseconfig)
if not isdir(abspath(self.OPTIONS.tmpdir)):
try:
makedirs(abspath(self.OPTIONS.tmpdir))
except Exception, e:
print(e)
exit(1)
if not isdir(abspath(self.OPTIONS.outdir)):
try:
makedirs(abspath(self.OPTIONS.outdir))
except Exception, e:
print(e)
exit(1)
if not isdir(abspath(dirname(self.OPTIONS.log_ips))):
try:
makedirs(abspath(dirname(self.OPTIONS.log_ips)))
except Exception, e:
print(e)
exit(1)
if not isdir(abspath(dirname(self.OPTIONS.decoded))):
try:
makedirs(abspath(dirname(self.OPTIONS.decoded)))
except Exception, e:
print(e)
exit(1)
#done setup, now initialize the decoding
self.startTime = time.time()
self.NIDS_INIALIZED = False #don't initialize nids twice!
if self.OPTIONS.interface:
nids.param('device', self.OPTIONS.interface)
self.run_nids()
elif self.OPTIONS.urlfetch:
if not self.OPTIONS.quiet:
print 'URL fetch %s' % (self.OPTIONS.urlfetch)
status, fname = self.fetch(options.urlfetch)
if not self.OPTIONS.quiet:
print status
else: #local file decode
if not self.url:
if myfile:
self.url = myfile #use filename as the root
if self.url and (not self.url in self.rooturl):
self.rooturl[self.url] = urlattr(self.rooturl, self.start)
if mydata:
self.rooturl[self.url].setMalicious(urlattr.ANALYZED)
if mydata.startswith('\xD4\xC3\xB2\xA1'): #pcap
if ENABLE_NIDS:
self.run_nids(myfile)
else:
print '[warning] %s not scanned because pynids ("import nids") failed' % (file)
else:
self.main_decoder(mydata, myfile)
if self.OPTIONS.active:
todo = []
firstTime = True
while todo or firstTime:
firstTime = False
if (not self.OPTIONS.quiet) and len(todo) > 0:
print 'Active Mode, fetching %d new URLs' % (len(todo))
while todo:
url = todo.pop()
status, fname = self.fetch(url)
self.rooturl[url].setMalicious(urlattr.ANALYZED)
if not self.OPTIONS.quiet:
type = ''
if self.rooturl[url].type:
type = '(%s) ' % (self.rooturl[url].type)
if not self.OPTIONS.quiet:
print '\tfetching URL %s%s' % (type, url) + status
for url in self.rooturl:
if self.rooturl[url].malicious == urlattr.NOT_ANALYZED:
if not (self.rooturl[url].type == 'img' or self.rooturl[url].type == 'input' or self.rooturl[url].type == 'link'):
todo.append(url)
def replaceCurrentDate(self, variable):
curdate = variable.find('$CURDATE')
if curdate > -1:
yr, mo, day = time.gmtime()[0:3]
before = ''
if curdate > 0:
before = variable[0:curdate]
after = variable[curdate + len('$CURDATE'):]
variable = '%s%04d%02d%02d%s' % (before, yr, mo, day, after)
return variable
def decodeVersions(self, to_write, isPDF):
decodings = [] #there may be multiple decodings if we get different results for version strings
duration = 0 #total elapsed time
runningTime = 0 #previous evaluation time
if isPDF:
pdfversions = ['', '9.1']
if not self.OPTIONS.fasteval:
pdfversions.append('8.0')
pdfversions.append('7.0')
for pdfversion in pdfversions: #if the runningTime is short, try these alternative versions
if duration < self.OPTIONS.timeout and runningTime <= self.OPTIONS.redoevaltime:
env_vars = 'app.viewerVersion = Number(%s);\n' % (pdfversion)
decoded, currentRunningTime = self.decodeJShelper('%s%s' % (env_vars, to_write))
runningTime = currentRunningTime
duration += currentRunningTime
decodings.append(['app.viewerVersion=' + pdfversion, decoded])
else:
need_to_write = 'var location = new my_location("%s","%s"); \n%s\n' % (self.url, self.url, to_write)
if not self.OPTIONS.fasteval: #don't evaluate HTML en/zh-cn in favor of performance
for lang in ['en', 'zh-cn']:
if duration < self.OPTIONS.timeout and runningTime <= self.OPTIONS.redoevaltime:
env_vars = 'navigator.systemLanguage=String("%s"); ' % lang
env_vars += 'navigator.browserLanguage=String("%s"); ' % lang
env_vars += 'document.lastModified=String("%s");\n' % re.sub('"', '', self.lastModified)
decoded, currentRunningTime = self.decodeJShelper('%s%s' % (env_vars, need_to_write))
runningTime = currentRunningTime
duration += currentRunningTime
decodings.append(['navigator.systemLanguage=' + lang, decoded])
browsers = [ ['IE7/XP', 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)'] ]
if not self.OPTIONS.fasteval:
browsers.append(['IE8/Vista', 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)'])
browsers.append(['Opera', 'Opera/9.64 (Windows NT 6.1; U; de) Presto/2.1.1'])
browsers.append(['Firefox', 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)'])
for name, browser in browsers:
if duration < self.OPTIONS.timeout and runningTime <= self.OPTIONS.redoevaltime:
midpoint = browser.find('/')
appCodeName = browser[:midpoint]
appVersion = browser[midpoint + 1:]
decoded, currentRunningTime = self.decodeJShelper('navigator.appCodeName = String("%s"); navigator.appVersion = String("%s"); navigator.userAgent = String("%s"); document.lastModified = String("%s");\n%s' % (appCodeName, appVersion, browser, self.lastModified, need_to_write))
runningTime = currentRunningTime
duration += currentRunningTime
decodings.append(['browser=' + name, decoded])
return decodings
def decodeJS(self, content, isPDF):
#return values are:
#(decoded scripts)
try:
to_write_headers, to_write = self.hparser.htmlparse(content)
except Exception, e:
to_write_headers, to_write = '', '' #print 'Error in htmlparsing', str(e)
if len(to_write) > 0: #html parse succeeded
to_write = to_write_headers + to_write
decodings = self.decodeVersions(to_write, isPDF)
#redo decoding if we didn't decode anything
if not self.OPTIONS.fasteval: #in performance optimized version, we should not evaluate this option
redo = 1
for version, decoding in decodings:
if len(decoding) > 0:
redo = 0
if redo:
#its possible that HTML parsing failed, then we should process the original content
more_decode = self.decodeVersions(content, isPDF)
for decode in more_decode:
decodings.append(decode)
else: #html parse failed (or was empty), treat original 'content' as JavaScript
decodings = self.decodeVersions(content, isPDF)
winner = ''
lengths = {}
for version, decoding in decodings:
thislen = len(decoding)
if len(decodings) > 1:
key = '%d' % (thislen)
if key in lengths:
lengths[key].append(version)
else:
lengths[key] = [version]
if thislen > len(winner):
winner = decoding
if len(lengths) > 1:
for a in lengths:
self.rooturl[self.url].log(self.OPTIONS.veryverbose, 0, 'Decoding option %s, \t%s bytes' % (' and '.join(lengths[a]), a))
return winner
def decodeJShelper(self, to_write, fixErrors=3):
if fixErrors > 1 and self.OPTIONS.fasteval:
fixErrors = 1
current_filename = '%s/tmpsha1_%s' % (self.OPTIONS.tmpdir, sha1(to_write).hexdigest())
fout = open(current_filename + '.js', 'wb')
if fout:
to_write = re.sub('\0', '', to_write)
fout.write(to_write)
fout.close()
else:
print 'Error: writing to tmpfile %s' % current_filename
return '', 0
decoded = errors = ''
begin = time.time()
try:
js_stdout = open(current_filename + '.stdout', 'wb')
js_stderr = open(current_filename + '.stderr', 'wb')
if self.OPTIONS.debug:
self.rooturl[self.url].dbgobj.add_timer()
if not (os.path.exists(self.OPTIONS.pre) and os.path.exists(self.OPTIONS.post)):
exit("Fatal: Failed to find pre.js and post.js")
po = subprocess.Popen(['js', '-f', self.OPTIONS.pre, '-f', current_filename + '.js', '-f', self.OPTIONS.post], shell=False, stdout=js_stdout, stderr=js_stderr)
timeLimitExceededReason = ''
while not timeLimitExceededReason and po.poll() == None:
curTime = time.time()
# Checking various timeouts -- if a timeout is hit, we'll break out of this while loop of polling doom.
if self.OPTIONS.timeout > 0 and (curTime - begin) >= self.OPTIONS.timeout:
timeLimitExceededReason = 'script analysis exceeded %d seconds (incomplete)' % (self.OPTIONS.timeout)
fixErrors = 0 #don't recurse into this function
elif self.OPTIONS.maxruntime > 0 and (curTime - self.startTime) >= self.OPTIONS.maxruntime:
timeLimitExceededReason = 'maxruntime exceeded %d seconds (incomplete)' % self.OPTIONS.maxruntime
self.OPTIONS.nojs = True #don't decode anything else
fixErrors = 0 #don't recurse into this function
else:
time.sleep(0.05)
if po.poll() == None:
#process didn't finish
os.kill(po.pid, signal.SIGKILL)
if self.OPTIONS.veryverbose:
self.rooturl[self.url].create_sha1file(self.OPTIONS.outdir, to_write, 'timeout')
#process finished/killed now
js_stdout.close()
js_stdout = open(current_filename + '.stdout', 'rb')
decoded = js_stdout.read()
js_stdout.close()
js_stderr.close()
js_stderr = open(current_filename + '.stderr', 'rb')
errors = js_stderr.read()
js_stderr.close()
if timeLimitExceededReason:
self.rooturl[self.url].log(True, 2, '%s %d bytes' % (timeLimitExceededReason, len(decoded)))
self.rooturl[self.url].setMalicious(2)
if self.OPTIONS.debug:
self.rooturl[self.url].dbgobj.add_launch(current_filename)
else:
os.remove(current_filename + '.js')
os.remove(current_filename + '.stdout')
os.remove(current_filename + '.stderr')
if errors:
errors = re.sub('\n\s*$', '', errors) #trailing newlines go away
errors = re.sub('tmpsha1_[0-9a-f]+\.js:', 'line:', errors) #temp filenames go away
res = re.search('(Type|Reference)Error: (.*) is (not |un)defined', errors)
ses = re.search('SyntaxError: illegal character:', errors)
tes = re.search('TypeError: (.*) is not a function', errors)
if ses:
#if self.OPTIONS.debug:
# print 'illegal chars fixing (%d)' % fixErrors
if fixErrors > 0:
stripped = cleanChars(to_write) #re.sub('[\x00-\x19\x7f-\xff]','',to_write)
newdecoded, runTime = self.decodeJShelper(stripped, fixErrors - 1)
if len(newdecoded) >= len(decoded):
decoded = newdecoded
elif res:
if fixErrors > 0:
if res.group(2).startswith('\\'): #a binary sequence shouldn't occur as a variable name
stripped = cleanChars(to_write) #re.sub('[\x00-\x19\x7f-\xff]','',to_write)
newdecoded, runTime = self.decodeJShelper(stripped, fixErrors - 1)
if len(newdecoded) >= len(decoded):
decoded = newdecoded
else:
self.rooturl[self.url].log(self.OPTIONS.veryverbose, -1, 'undefined variable %s' % (res.group(2)))
to_write = 'var %s = 1;\n%s' % (res.group(2), to_write)
newdecoded, runTime = self.decodeJShelper(to_write, fixErrors - 1)
if len(newdecoded) >= len(decoded):
decoded = newdecoded
elif tes:
if fixErrors > 0:
#we could try to reconstruct the function by looking in decodings
#(same thing with variables)
self.rooturl[self.url].log(self.OPTIONS.veryverbose, -1, 'undefined function %s' % (tes.group(1)))
to_write = '%s = function (a){}\n%s' % (tes.group(1), to_write)
newdecoded, runTime = self.decodeJShelper(to_write, fixErrors - 1)
if len(newdecoded) >= len(decoded):
decoded = newdecoded
else:
if re.search('SyntaxError: ((illegal|invalid|unexpected end of) XML|syntax error)', errors):
pass #self.rooturl[self.url].log(self.OPTIONS.veryverbose,-1,'expecting JavaScript, got HTML')
else:
self.rooturl[self.url].log(self.OPTIONS.veryverbose, -1, '%s' % re.sub('\n', '\n\terror: ', errors))
except Exception, e:
self.rooturl[self.url].log(self.OPTIONS.veryverbose, -1, 'Error: Fatal error in decodeJS: %s (probably you are missing "js" in your path)' % e)
return '', (time.time() - begin)
return decoded, (time.time() - begin)
def build_url_from_path(self, path):
''' Build a full URL from possible components/pieces
urlin is the URL from the HTML
if the path startswith http, return
if the path starts with /, return server + path
if the path is relative, return serverpath+path
'''
if path.find('\\/') > -1:
#fix escaped slashes
path = re.sub('\\\/', '/', path)
if path.startswith('http') or path.startswith('//'):
return re.sub('^[https]*:?//', '', path)
if path.startswith('hcp:'):
return path
if path.startswith('/'):
if self.url.startswith('/'):
server = '127.0.0.1'
else:
server = re.sub('([^/])/.*$', '\\1', self.url)
return server + path
#relative, preserve directory (unless its a file)
serverpath = re.sub('/[^\/]*$', '/', self.url)
if self.url.startswith('/'): #its a file
serverpath = '127.0.0.1/'
result = serverpath + path
spaces = result.find(' ')
if spaces > -1:
lessthan = result.find('<')
if -1 < lessthan < spaces:
result = result[:lessthan]
else:
result = result[:spaces]
return result
def find_urls(self, data, tcpaddr=[]):
'''returns JavaScript (if it exists)'''
jsdata = ''
if data.find('http:') > -1:
varurl = re.findall('var[^=]*=[\\\'" ]+(http:[^\'"\n]+)[\\\'"]', data, re.IGNORECASE)
for i in varurl:
if i.find('\\/') != -1:
i = re.sub('\\\/', '/', i)
i = re.sub('^[https]+://', '', i)
self.rooturl[self.url].setChild(i, 'jsvar')
self.rooturl[self.url].log(self.OPTIONS.verbose, 0, '[javascript variable] URL=%s' % i)
metarefresh = re.findall('content\s*=\s*[\\\'"]?\d+\s*;\s*url\s*=\s*([^ \r\\\'"]+)', data, re.IGNORECASE)
for i in metarefresh:
i = self.build_url_from_path(i)
self.rooturl[self.url].setChild(i, 'metarefresh')
self.rooturl[self.url].log(self.OPTIONS.verbose, 0, '[meta refresh] URL=%s' % i)
if data.find('//jsunpack.url') > -1:
fetch = re.findall('//jsunpack.url (.*?) = (.*?)\n', data)
#//jsunpack.url setAttribute src = URL
for desc, i in fetch:
i = self.build_url_from_path(i)
self.rooturl[self.url].setChild(i, desc)
self.rooturl[self.url].log(self.OPTIONS.verbose, 0, '[%s] URL=%s' % (desc, i))
if data.find(' src=') > -1:
iframe = re.findall('<(i?frame|embed|script|img|input)[^>]*?[ ]+src=\\\\?[\\\'"]?(.*?)\\\\?[\\\'"> ]', data, re.IGNORECASE)
for type, i in iframe:
type = type.lower()
i = self.build_url_from_path(i)
if i.startswith('hcp:'):
lt = i.find('%3c')
LT = i.find('%3C')
if lt == -1 and LT > -1:
lt = LT
if lt > -1:
jsdata += re.sub('%([a-fA-F0-9]{2})', lambda mo: convert(mo.group(1)), i[lt:])
self.rooturl[self.url].setChild(i, type)
self.rooturl[self.url].log(self.OPTIONS.verbose, 0, '[%s] %s' % (type, i))
if data.find('<link ') > -1:
links = re.findall('<(link)[^>]*?[ ]+href=\\\\?[\\\'"]?(.*?)\\\\?[\\\'"> ]', data, re.IGNORECASE)
for type, i in links:
type = type.lower()
i = self.build_url_from_path(i)
self.rooturl[self.url].setChild(i, type)
if data.find(' archive=') > -1:
#Ex. <applet mayscript='true' code='bpac.a.class' archive='bnktjvdpxuko4.jar
jars = re.findall('<(applet|object)([^>]*)[ ]+archive=\\\\?[\\\'"]?(.*?)\\\\?[\\\'"> ]', data, re.IGNORECASE)
for type, other_text, i in jars:
i = self.build_url_from_path(i)
self.rooturl[self.url].setChild(i, type)
return jsdata
def strings(self, data):
out = []
readable = re.compile('[\w\s\.\-_=:\$\(\)\\/\'\"\?\&]{4,}')
matches = readable.findall(data, re.IGNORECASE)
if matches:
for match in matches:
match = match.strip()
if match is not None:
#if re.search(filter,match,re.IGNORECASE) != None:
out.append(match)
return out
def signature(self, data, level, tcpaddr=[], isPDF=True):
if self.OPTIONS.debug:
self.rooturl[self.url].dbgobj.add_timer()
hits = self.SIGS.process(data, level, isPDF)
maxImpact = 0
for id, ref, detect, impact, rulemsg in hits:
if impact > maxImpact:
maxImpact = impact
if maxImpact <= 5:
hitsAlt = self.SIGSalt.process(re.sub('[^a-zA-Z]', '', data), level, isPDF)
for h in hitsAlt:
if not h in hits:
hits.append(h)
for id, ref, detect, impact, rulemsg in hits:
self.rooturl[self.url].setMalicious(impact)
alerttxt = []
for msg in detect:
if msg.startswith('//shellcode '):
self.handle_shellcode(msg, tcpaddr, isPDF)
else:
alerttxt.append(msg)
if alerttxt:
detected = []
for a in alerttxt:
a = re.sub('[\x00-\x1f\x7f-\xff]', '.', a)
if not a in detected:
detected.append(a)
tmptxt = rulemsg
if id > 0:
tmptxt += '(id %d) ' % id
if ref:
tmptxt += ' ' + ' '.join(ref)
tmptxt += ' detected %s' % (' '.join(detected))
self.rooturl[self.url].log(True, impact, tmptxt)
if impact > 5: #only log malicious
self.log_ips()
if self.OPTIONS.debug:
self.rooturl[self.url].dbgobj.add_detect(data)
def log_ips(self):
if self.OPTIONS.log_ips:
ip = self.rooturl[self.url].getIP()
if (not ip in self.ips) and ip != '0.0.0.0':
if not self.internal_addr(ip):
iplog = open(self.OPTIONS.log_ips, 'a')
iplog.write('IP\t%s\t%d\n' % (ip, time.mktime(time.localtime())))
iplog.close()
self.ips.append(ip)
hostname, dstport = self.hostname_from_url(self.url)
if hostname and (not hostname in self.ips):
iplog = open(self.OPTIONS.log_ips, 'a')
iplog.write('DM\t%s\t%d\n' % (hostname, time.mktime(time.localtime())))
iplog.close()
self.ips.append(hostname)
def handle_shellcode(self, detect, tcpaddr, isPDF=False):
#hex = re.match('//shellcode .*? = (.*)$', detect)
hex = re.match('//shellcode (pdf|len) (\d+) .*? = (.*)$', detect)
#//shellcode len 767 (including any NOPs) payload = %u0A0A%u0A0A%u0A0A%uE1D9%u34D9%u5824%u5858
if hex:
source = hex.group(1) #source (pdf|len) currently unused
sclen = hex.group(2)
value = hex.group(3)
value_new = re.sub('%([a-fA-F0-9]{2})', lambda mo: convert(mo.group(1)), value)
value_new = re.sub('%u([a-fA-F0-9]{2})([a-fA-F0-9]{2})', lambda mo: convert(mo.group(2)) + convert(mo.group(1)), value_new)
if len(value_new) > 50:
#only flag shellcode > 50 length
self.rooturl[self.url].create_sha1file(self.OPTIONS.outdir, value_new, 'shellcode')
impact = 5
if isPDF:
#greater impact because shellcode in PDF files is less likely to have false positives
impact = 7
self.log_ips()
self.rooturl[self.url].log(True, impact, 'shellcode of length %d/%s' % (len(value_new), sclen))
self.rooturl[self.url].setMalicious(impact)
for t in self.strings(value_new):
if t.count('.com') + t.count('http'):
t = re.sub('^.*?[http]+://', '', t)
self.log_ips()
self.rooturl[self.url].setChild(t, 'shellcode')
self.rooturl[self.url].setMalicious(8)
self.rooturl[self.url].log(True, 8, 'shellcode URL=%s' % (t))
if len(value_new) > 100000:
pass #out += '\t[info] shellcode overly large, not handling XOR'
elif not self.OPTIONS.fasteval: # don't perform XOR operation in favor of performance
for key in range(1, 255):
tmp = ''
for x in range(0, len(value_new)):
tmp += chr(ord(value_new[x]) ^ int(key))
results = tmp.count('.com') + tmp.count('http')
if results:
self.rooturl[self.url].log(True, 10, 'XOR key [shellcode]: %d' % (key))
self.log_ips()
for t in self.strings(tmp):
if t.count('.com') + t.count('http'):
t = re.sub('^.*?[http]+://', '', t)
self.rooturl[self.url].setChild(t, 'shellcode')
self.rooturl[self.url].setMalicious(10)
self.rooturl[self.url].log(True, 10, 'shellcode [xor] URL=%s' % (t))
def dechunk(self, input):
try:
data = input
decoded = ''
chunk_pos = data.find('\n') + 1
chunked = int('0x' + data[:chunk_pos], 0)
while(chunked > 0):
#decode it!
decoded += data[chunk_pos:chunked + chunk_pos]
data = data[chunk_pos + chunked + 2:] #+2 skips \r\n
chunk_pos = data.find('\n') + 1
chunked = int('0x' + data[:chunk_pos], 0)
return decoded
except:
return input
def degzip(self, gzip_data):
try:
out = gzip_data #default in case of failure
datafile = StringIO.StringIO(gzip_data)
gzfile = gzip.GzipFile(fileobj=datafile)
out = gzfile.read()
gzfile.close()
datafile.close()
except:
pass
return out
def handleTcpStream(self, tcp):
((src, sport), (dst, dport)) = tcp.addr
if tcp.nids_state == nids.NIDS_JUST_EST:
#if dport in (80, 8000, 8080):
tcp.client.collect = 1
tcp.server.collect = 1
if self.forceStreams:
self.streams[tcp.addr] = tcp
elif tcp.nids_state == nids.NIDS_DATA:
if self.forceStreams:
self.streams[tcp.addr] = tcp
tcp.discard(0)
elif tcp.nids_state in end_states:
if self.forceStreams:
del self.streams[tcp.addr]
self.handleTcpHelper(tcp)
def handleTcpHelper(self, tcp):
((src, sport), (dst, dport)) = tcp.addr
toserver = tcp.server.data[:tcp.server.count]
toclient = tcp.client.data[:tcp.client.count]
#uris = re.findall("(GET|POST|HEAD)\s+(\S+)", toserver)
#dom = re.findall("\nHost:\s*(\S+)", toserver)
#ONLY handle HTTP/1.1, which assumes Host: header is always available
lines = toserver.split('\n')
method = uri = host = referer = ''
http_request = []
for line in lines:
http = re.search('^(GET|POST|HEAD)\s+(\S+)\s+HTTP/\d\.\d', line)
if http:
method, uri = http.group(1), http.group(2)
#header = re.search('^(.*?):\s*(\S+)\s*$',line)
header = re.search('^(.*?):\s*(.+)\s*$', line)
if header:
type, value = header.group(1).lower(), header.group(2)
value = re.sub('\r', '', value)
if type == 'host':
host = value
if type == 'referer':
referer = canonicalize(value)
if re.search('^\r?$', line):
if method:
if not host:
host = dst
fulluri = uri.find(host)
if -1 < fulluri <= 8:
#replace uri to remove host
uri = uri[fulluri + len(host):]
get_url = host + uri
#Everything has start as its parent (if its a pcap/interface)
if not self.start in self.rooturl:
self.rooturl[self.start] = urlattr(self.rooturl, self.start)
self.rooturl[self.start].setTcpMethod(get_url, tcp.addr, method)
http_request.append([method, host, uri, referer])
method = uri = host = ''
#if there is no trailing newline, handle the last request
if method:
if not host:
host = dst
http_request.append([method, host, uri, referer])
method = uri = host = ''
lines = toclient.split('\n')
code = ''
http_response = []
collect = 0
length = 0
collected_data = ''
is_gzipped = is_chunked = 0
is_redir = ''
tObj = time.strptime('Tue, 03 Feb 2004 05:06:07 GMT', '%a, %d %b %Y %H:%M:%S %Z')
lastModified = time.strftime('%m/%d/%Y %H:%M:%S', tObj)
for line in lines:
http = re.search('^(.*)HTTP/\d\.\d\s+(\d+)', line)
#http = re.search('^HTTP/\d\.\d\s+(\d+)', line)
if http:
previouscode = code
previousdata, code = http.group(1), http.group(2)
if len(previousdata) > 0:
collected_data += previousdata
if collect:
if length > 0 and length != len(collected_data):
if self.OPTIONS.veryverbose:
print '[warning] http response header len = %d, actual len = %d' % (length, len(collected_data))
http_response.append([previouscode, collected_data, is_gzipped, is_chunked, is_redir, lastModified])
collected_data = ''
collect = 0
length = 0
elif previouscode:
print '[warning] server response ignored ', tcp.addr
is_gzipped = is_chunked = 0
is_redir = ''
header = re.search('^([^:]*):\s*(.*)\s*$', line)
if header:
_value_with_case = header.group(2)
_value_with_case = re.sub('\r', '', _value_with_case)
type, value = header.group(1).lower(), _value_with_case.lower()
if type == 'transfer-encoding':
if value.find('chunked') >= 0:
is_chunked = 1
if type == 'content-encoding':
if value.find('gzip') >= 0:
is_gzipped = 1
if type == 'content-length':
h_len = re.search('^(\d+)', value)
length = int(h_len.group(1))
if type == 'last-modified':
#Last-Modified: Fri, 12 Dec 2008 17:11:16 GMT
#this is only case where we want the original value, not lowercase
try:
tObj = time.strptime(_value_with_case, '%a, %d %b %Y %H:%M:%S %Z')
lastModified = time.strftime('%m/%d/%Y %H:%M:%S', tObj)
except:
pass #ignore malformed lastModified values
if type == 'location':
is_redir = value
if type == 'refresh':
#Refresh: 2; URL=http://example
vals = value.split('=')
if len(vals) == 2:
is_redir = vals[1]
if collect:
collected_data += line + '\n'
if re.search('^\r?$', line):
if code:
collect = 1
#if there is no trailing newline, handle the last response
if collect and code:
http_response.append([code, collected_data, is_gzipped, is_chunked, is_redir, lastModified])
for i in range(0, len(http_response)):
url = ''
if i < len(http_request):
method, host, uri, referer = http_request[i]
url = canonicalize(host + uri)
else:
method = host = uri = referer = ''
print '[warning] http_request information not available for ', tcp.addr
continue
code, data, gzip, chunk, redir, lastModified = http_response[i]
if chunk:
data = self.dechunk(data)
if gzip or data[0:2] == '\x1f\x8b':
data = self.degzip(data)
if redir:
if not redir.startswith('http'):
redir = host + redir
redir = re.sub('^https?://', '', redir)
redir = canonicalize(redir)
self.rooturl[url].setChild(redir, 'server_redirect')
if referer:
if referer in self.rooturl:
self.rooturl[referer].setChild(url, 'refer')
self.main_decoder(data, url, tcp.addr, lastModified)
def internal_addr(self, ipin):
'''returns True if 127.*, or other internal addr'''
ip = struct.unpack('=L', socket.inet_aton(ipin))[0]
blocks = [
['127.0.0.0', 8],
['10.0.0.0', 8],
['192.168.0.0', 16],
['172.16.0.0', 12] ]
for block, n in blocks:
ipnet = struct.unpack('=L', socket.inet_aton(block))[0] & (2L << n - 1) - 1
if ipnet | ip == ipnet:
return True
return False
def hostname_from_url(self, url):
'''returns [hostname,port]'''
hostname = '0.0.0.0'
dstport = 80
slashIndex = url.find('/')
if slashIndex > -1:
hostname = url[:slashIndex] #everything before the first /
else:
hostname = url #everything
if hostname:
colonIndex = hostname.find(':')
if colonIndex > -1:
try:
dstport = int(hostname[colonIndex + 1:])
except:
pass #ignore errors in port
hostname = hostname[:colonIndex]
return hostname, dstport
def fetch(self, url):
if url.startswith('hcp:'):
return 'Not fetching (hcp url)', ''
self.url = canonicalize(url)
#self.rooturl must already have an entry for url
if not self.url in self.rooturl:
self.rooturl[self.url] = urlattr(self.rooturl, self.url)
if self.url.startswith('127.0.0.1'):
self.rooturl[self.url].malicious = urlattr.DONT_ANALYZE
return 'Not fetching (local file)', ''
refer = ''
for parenturl in self.rooturl:
for type, child in self.rooturl[parenturl].children:
if url == child:
refer = parenturl
if (not refer) or refer.startswith(self.OPTIONS.outdir):
refer = self.defaultReferer
self.rooturl[self.url].status = '\t(referer=%s)\n' % (refer)
fname = ''
try:
hostname, dstport = self.hostname_from_url(url)
if self.OPTIONS.proxy and (not self.OPTIONS.currentproxy):
proxies = self.OPTIONS.proxy.split(',')
self.OPTIONS.currentproxy = proxies[random.randint(0, len(proxies) - 1)]
if not self.OPTIONS.quiet:
print '[fetch config] random proxy %s' % (self.OPTIONS.currentproxy)
request = urllib2.Request('http://' + url)
request.add_header('Referer', 'http://' + refer)
request.add_header('User-Agent', 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)')
if self.OPTIONS.currentproxy:
if not self.OPTIONS.quiet:
print '[fetch config] currentproxy %s' % (self.OPTIONS.currentproxy)
proxyHandler = urllib2.ProxyHandler({'http': 'http://%s' % (self.OPTIONS.currentproxy) })
opener = urllib2.build_opener(proxyHandler)
else:
opener = urllib2.build_opener()
try:
remote = opener.open(request).read()
except urllib2.HTTPError, error:
remote = error.read()
if len(remote) > 0:
if len(remote) > 31457280:
return 'Not fetching (large file)', ''
try:
fname = self.rooturl[self.url].create_sha1file(self.OPTIONS.outdir, remote, 'fetch')
self.rooturl[self.url].status += '\tsaved %d bytes %s\n' % (len(remote), fname)
resolved = socket.gethostbyname(hostname)
self.rooturl[self.url].tcpaddr = [['0.0.0.0', 0], [resolved, dstport]]
except:
pass #fail to lookupagain? odd hmm
self.main_decoder(remote, url)
else:
self.rooturl[self.url].malicious = urlattr.ANALYZED
except Exception, e:
self.rooturl[self.url].status += '\tfailure: ' + str(e) + '\n'
self.rooturl[self.url].malicious = urlattr.DONT_ANALYZE
return self.rooturl[self.url].status, fname
def main_decoder(self, data, url, tcpaddr=[], lastModified=''):
url = canonicalize(url)
self.url = url
self.lastModified = lastModified
if not self.url in self.rooturl:
self.rooturl[self.url] = urlattr(self.rooturl, self.url, tcpaddr) #initialization
self.rooturl[self.url].setMalicious(urlattr.ANALYZED)
predecoded = data
level = 0
if self.OPTIONS.debug:
import debug
if not hasattr(self.rooturl[self.url], 'dbgobj'):
self.rooturl[self.url].dbgobj = debug.DebugStats(self.url, self.OPTIONS.tmpdir)
self.rooturl[self.url].dbgobj.start_main()
#Save all file streams
if self.OPTIONS.saveallfiles:
self.rooturl[self.url].create_sha1file(self.OPTIONS.outdir, data, 'stream')