Firefox en console c’est mieux que lynx !

C’est quoi le plan;

Aujourd’hui, comment instrumenter un browser pour lui faire cracher un rendu de page web sur une debian le tout en console.

On va utiliser un truc nommé selenium qui est vieux comme le monde mais dont personne n’avait pensé à m’en parler avant. Et ce truc permettra de piloter un firefox. Pour se passer d’installation de debian graphique et pouvoir tout de meme le piloter on va utiliser xvfb qui est un serveur X “frame buffer”.. Bref un faux serveur X qui fait le rendu en ram sans l’afficher.

C’est partis

Primo on va installer quelque paquets nécessaires, et aussi firefox depuis un repository de linuxmint (ces psychorigides de debianistes n’aiment pas le licencing de Ffox ).

Première étape, installer la clef du repo  (ayez confiiiiannnce, nooon ne le faite pas !).

sudo gpg --keyserver pgp.mit.edu --recv-keys 3EE67F3D0FF405B2
sudo gpg --export 3EE67F3D0FF405B2 > 3EE67F3D0FF405B2.gpg
sudo apt-key add ./3EE67F3D0FF405B2.gpg
sudo rm ./3EE67F3D0FF405B2.gpg

Ensuite on va ajouter ce repo dans notre liste de source de paquets (/etc/apt/source.list)

deb http://packages.linuxmint.com debian import

Et on est pret pour installer tout ce qu’il nous faut.

sudo apt-get update
sudo apt-get install firefox xvfb libasound2 libdbus-glib-1-2 libgtk2.0-0

Et bien sur selenium qui va bien depuis PIP (on est sous debian hein…)

pip install -U selenium

Voila tout est pret.

Formidable selenium

C’est partis, on va piloter notre browser via python (Selenium supporte d’autre languages mais sérieux quoi, python ca me va) Voici le petit script qui va permettre de capturer un site web, il est dispo dans mon git à broll httpgrab.py.

#!/usr/bin/env python
# coding=utf-8   
import  sys,os
from selenium import webdriver

# Functions
def getparam(count):
  if len(sys.argv) != count+1:
    print 'My command'
    print 'To Use: '+ sys.argv[0]+  ' my params'
    sys.exit(1)
  else:
    return sys.argv[1],sys.argv[2]

# Main Code #####
def main():
  page, name = getparam(2)
  print ("get %s to %s" % (page,name))
  print ("Start FFox")
  seleniumobj = webdriver.Firefox()
  print ("Get Page")
  seleniumobj.get(page)
  print ("Save Page")
  seleniumobj.save_screenshot(name)
  seleniumobj.quit()


if __name__ == '__main__':
  main()

On le voit, c’est 3 lignes de code (firefox(), get(), save_screenshot()). Et quand on le lance c’est via xvfb-run qui va démarre le faux X pour notre firefox.

$ xvfb-run ./get_pageimg.py http://www.perdu.com perdu.png
get http://www.perdu.com to perdu.png
Start FFox
Get Page
Save Page

Et Bingo !

perdu

 

Posted in Coding | Tagged | 1 Comment

Extraction de String / Episode A

Bon… des fois, la fonction d’obfuscation de string d’un malware est chiante et illisible (bref comme il faudrait que ce soit) Et en plus décousue, je veux dire par là que le malware va la picorer et ne deobfusque pas toutes les strings d’un coup. Bref dans ce cas la… on va lancer cette petite fonction avec toutes les strings offusquée pour tout clarifier.

Donc j’ai pondu un dégeulasse petit prog qui remappe l’exe en mémoire et appelle la dite fonction pour arracher les strings. Il prend ses commandes depuis un fichier texte.

Petit exemple, On ferme les yeux, devant vous un superbe malware qui obfusque ses strings, (voir https://github.com/Th4nat0s/Chall_Tools/blob/master/C/usefonc/hello.cpp)

#include <windows.h>
#include <stdio.h>

char obf[] = "HAL";
int key = 1;

int unobf(int incr, char  mystring[]) {
  char i=0;
  do {
      mystring[i] =  mystring[i] + incr;
      i++; 
    } while (mystring[i] != 0);
}

int main(){
  printf( "Obfuscation Function at %p\n", int(unobf));
  printf( "Obfuscated string at  %p\n", int(&obf));
  printf( "Obfuscated Key at  %p\n", int(&key));
  unobf( key, obf);
  printf( "The computer brand is %s\n", obf);
  return(0);
}

Bref un petit prog typique d’obfuscation de string a deux balles. Normalement il faut prendre IDA pour savoir ce qu’il appelle et comment, là il est sympas il file les offsets :) . Ensuite on remplis le fichier texte.

; offset , obfstr, key
0402008,0040200C,004013A0
0402008,0040200C,004013A0
; nop

Le premier paramètre c’est l’offset de la fonction de décryptage, le second c’est la string obfusquée et le 3eme c’est la clef d’encryption (Si il y a besoin).

A coté de cela, parce que défois, les appel de fonctions ne sont pas standard C (merci Delphi), pour remapper le call comme on veut rapidement,  j’ai fait un petit bout en asm intermédiaire. C’est plus simple. (voir https://github.com/Th4nat0s/Chall_Tools/blob/master/C/usefonc/usefonc.asm)

   push  ebp
   mov   ebp,esp
   pusha
   mov   [myesp],esp

   mov   ebx,[ebp+0x08]  ; Second Parameter = Obf String
   mov   ecx,[ebp+0x0c]  ; Third Parameter = Key
   add   esp,256 ; keep space on stack

;---------------------------
   ; Remap function call as expected..
   push  ebx ;  Push Ascii String offset ( type pointer)
   mov   ecx,[ecx]
   push  ecx ;  push value of Key (type integer)
   call  [ebp+0x10] ; Call the fuction to decode

   ; on the hello example the result in in EBX
   ; considerer ici que tous les registres sont détruit..
   mov   [sauvegarde],EBX
;-------------------------
   mov esp,[myesp]  ; Get back the stack on the good place
   popa
   pop   ebp
   mov   eax, [sauvegarde] ; Get back the string offset•
   ret

Et pof on lance…

C:\Users\Administrator\Documents\code>usefonc.exe hello.exe query.txt
Loading hello.exe in memory
load file ok
PE32 Detected
IMAGEBASE: 0x00400000
SIZEOFIMG: 0x0000f000 - 61440 Bytes
Memory allocatedCurrent Process: 0x00400000
Loading command query.txt file
Read 6 command lines
line 2 - 0402008,0040200C,004013A0
line 3 - 0402008,0040200C,004013A0
0x00402008:IBM
0x00402008:JCN

Bingo…

Et si c’était a refaire, je ferais plus comme cela, je partirais sur un start suspended et je loaderai une DLL qui hookerai le process et qui ferait tout le taf, et en plus les lib seraient tous loadées.

Là j’ai des soucis, défois le Malloc de l’espace 0x40000 est pas forcément possible et il faut relancer deux trois fois le bignou.

Next step, le python qui pond automatiquement le fichier de commande sous IDA. En attendant, si cela sert a quelqu’un, le source est là :

https://github.com/Th4nat0s/Chall_Tools/tree/master/C/usefonc

a+

Posted in Asm, Reverse | Tagged , , | Leave a comment

Quand ca merde, il faut aussi le dire…

Aujourd’hui M. Le MacBook Air a décidé de me peiner, j’ai eu droit a écran noir, et au power off forcé / power on le traditionnel “tadaaaa” mais toujours écran noir. Pas moyen de s’en sortir..

Heureusement la KB m’a sauvé, RESET de la NVRAM, encore un combo de touche inédit

https://support.apple.com/en-us/HT204063

 

Posted in BlaBla | Tagged | Leave a comment

Merde le jouet a spam a tout laché…

Des programmes qui foirent c’est défois drôle, voici un «Spam» trouvé sur mon WordPress qui laisse entrevoir la difficulté de filtrer un spam sur une simple phrase.

Screen Shot 2015-04-13 at 23.09.11

{
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owners|website owners|web owners} and bloggers made good content as you did, the
{internet|net|web} will be {much more|a lot more} useful than ever before.|
I {couldn’t|could not} {resist|refrain from} commenting.
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{bookmarked|book marked|book-marked|saved as a favorite} it.

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{give it a look|look it over|take a look|check it out}.

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{I love|I really like|I enjoy|I like|Everyone loves} what
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{This sort of|This type of|Such|This kind of} clever work and
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{internet browsers|web browsers|browsers} and I must say this
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{Thanks a lot|Kudos|Cheers|Thank you|Many thanks|Thanks}, I appreciate it!|
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in fact was a amusement account it. Look advanced to {far|more} added
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something to do with {web browser|internet browser|browser}
compatibility but I {thought|figured} I’d post to let you know.

The {style and design|design and style|layout|design} look great though!
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This is a topic {that is|that’s|which is} {close to|near to} my heart…

{Cheers|Many thanks|Best wishes|Take care|Thank you}!
{Where|Exactly where} are your contact details though?|
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to {books|textbooks}, as I found this {article|post|piece of writing|paragraph} at this {website|web site|site|web
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{a long time|a while|some time} now and finally got the {bravery|courage} to go ahead and give you a shout out from
{New Caney|Kingwood|Huffman|Porter|Houston|Dallas|Austin|Lubbock|Humble|Atascocita} {Tx|Texas}!
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If so how do you {prevent|reduce|stop|protect against} it, any plugin or anything you can {advise|suggest|recommend}?

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{It is the|It’s the} little changes {that make|which will make|that
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your {great|wonderful|fantastic|magnificent|excellent} writing {due to|because of}
this problem.|
{I’m|I am} not sure where {you are|you’re} getting your {info|information},
but {good|great} topic. I needs to spend some time learning {more|much more}
or understanding more. Thanks for {great|wonderful|fantastic|magnificent|excellent} {information|info} I was looking for this {information|info} for my mission.|
{Hi|Hello}, i think that i saw you visited my {blog|weblog|website|web site|site} {so|thus} i came to “return the favor”.{I am|I’m} {trying to|attempting to}
find things to {improve|enhance} my {website|site|web site}!I
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Posted in BlaBla | Leave a comment

DecrottePE compatible chinese style.

Bon tant que j’y était, histoire de plus perdre de temps avec certains packer à deux balles ou des dumps encrypté à la chinoise (Xor de base ou Xor shifté).

Voici une version de «decrottePE.py» qui bruteforce; C’est pas joli, mais ce qu’il y a trouver est pas non plus joli-joli !

Exemple , j’encrypte à la chinoise un PE avec un xor shifté et la clef 0x42 (évidemment la fameuse solution universelle).

$ xor.py monPE.exe 0x42 inc
data, key, inc, base, result
(77, 66, 1, 0, 15)
(90, 67, 1, 0, 25)
(144, 68, 1, 0, 212)
(0, 69, 1, 0, 69)
(3, 70, 1, 0, 69)
(0, 71, 1, 0, 71)
(0, 72, 1, 0, 72)
(0, 73, 1, 0, 73)
(4, 74, 1, 0, 78)
... 
writing output to monPE.exe.xor

Je cache mon PE xoré au millieu d’un champ de random.

$ dd if=/dev/urandom of=random bs=1 count=768
768+0 records in
768+0 records out
768 bytes (768 B) copied, 0.00350417 s, 219 kB/s
$ cat random monPE.exe.xor random > data

Bon… c’est le plus chiant qu’il soit possible d’extraire avec ce truc, lançons le décrotteur et allons lire un livre.

$ decrottePE.py data -xor
[i] Ok I Will Brutalizing the XorCipher
[i] Scanning toto
[!] No PE found, will try the chinese style; SIMPLE XOR 
[!] No PE found, will try the chinese style; XOR Shifted  
[!] No PE found, will try the chinese style; XOR Shifted looking every offsets
>Seeking / 8Bits Xor Inc key 62 offset  4                                 
[*] Found PE_768.exe 144896 bytes saved
[i] I was victorious...

Bingo… et le fichier est en état.

$ diff PE_768.exe monPE.exe -s
Files PE_768.exe and monPE.exe are identical

Amis du XOR, merci de passer a RC4…

 

Posted in Crypto, Malware, Reverse | Tagged , , | 1 Comment

La formidable librairie PEFILE

Petit focus sur la librairie python pefile (Dispo ICI ) créée par Ero Carrera. Cette librairie permet de parser un executable windows sans se fatiguer que celui-ci soit 64 ou 32 bits.

J’ai pondu deux minis scripts python avec cette librairie, le premier est un update d’un script déja vu ici, qui montre les sections et leur entropie nommé «peentro.py». Un peu à la virus total, mais chez soi et qui couine sur les trucs «chelous».

Le script est ici

$ ./peentro.py PE_538115.exe 
Section         Entropy         Size    MD5                                     Remark
                6.3727153341    102400  98defc674456ba21609a0312dc407638        No section name,Unusal Segment
                6.11305980197   20992   27252d4d114a91a0d7884cdb44fe4e49        No section name,Unusal Segment
                4.08996922927   4096    d325d560d6d4575bdbb5d948fd9bce3e        No section name,Unusal Segment
                4.98423902683   5120    5fdce4f429a0cc4460f2638823420bc6        No section name,Unusal Segment
                1.9077687349    1024    ebaa0f9b6cd4133424cbb39591a06ab9        No section name,Unusal Segment
$ ./peentro.py PE_262147.exe 
Section         Entropy         Size    MD5                                     Remark
.text           7.16030509804   143872  07d0e487f99c29f92e8861609f2daa27        High Entropy
.data           1.81463545985   512     2fc3edaab56833f2f092181a9ca16f65

Le second est un script de feignants nommé «decrottePE.py». Il extrait les executables PE depuis un dump. C’est toujours utile pour carver un executable depuis un dump mémoire volé dans un droppeur sans avoir a se fatiguer. L’executable est sauve à sa taille “normale” les overlay potentiels au cul de l’exe sont shootés.

le script est ici

$ ./decrottePE.py dump 
Candidate Found at offset 22080 False positive
Candidate Found at offset 131072 False positive
Candidate Found at offset 153155 False positive
Candidate Found at offset 262147 PE_262147.exe 144896 bytes saved
Candidate Found at offset 405670 False positive
Candidate Found at offset 429123 False positive
Candidate Found at offset 538115 PE_538115.exe 134656 bytes saved
Candidate Found at offset 565917 False positive
Candidate Found at offset 566040 False positive
Candidate Found at offset 568820 False positive
Candidate Found at offset 694851 False positive

Cette lib est décidément un bel objet.

 

Posted in Reverse | Tagged , , | 1 Comment

1er jour des soldes, -25% sur Charlie Hebdo

Non… Moi je trouve décidément ca très drôle leur petit dessins.

 

Mahomet

 

http://www.charliehebdo.fr/20150107171028368.pdf

Il ne fait décidément pas bon d’être copain avec Dorothée ces temps ci..

Posted in BlaBla | Leave a comment

Quick Tip… un clean desktop sur OSX

Marre de votre osx avec 58953 documents sur le bureau du mac… ?

defaults write com.apple.finder CreateDesktop false; killall Finder

C’était le conseil psycho-rigide de noel.

Posted in BlaBla | Tagged | 2 Comments

Le cap a été franchis…

Ca y est le premier exploit avec du bypass de EMET a été débusqué

http://researchcenter.paloaltonetworks.com/2014/11/addressing-cve-2014-6332-swf-exploit/

Ca reste du emet 4.1, ca bypass pas toutes les protections… Mais c’est partis ! :)

Posted in Malware, Reverse | Tagged , , | Leave a comment

CISCO goes ASLR !!

Whow… Cisco sur certain routeur tournerai “déja” de l’asrl !! Well done.

http://www.cisco.com/web/about/security/intelligence/integrity-assurance.html#_Toc385320754

Posted in Asm, Network | Tagged , | Leave a comment