Backdoor.Win32.Zombam.gen Code Execution

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

MD5 | bc125cb6e509f9cc9002fd74b5a4119c

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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

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 Response: executed

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