Backdoor.Win32.Zombam.l / Unauthenticated URL Command Injection

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Backdoor.Win32.Zombam.l / Unauthenticated URL Command Injection

From: malvuln <malvuln13 () gmail com>
Date: Sat, 3 Jul 2021 17:42:24 -0400

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: malvuln13 () gmail com

Threat: Backdoor.Win32.Zombam.l
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".

welcome 2 HTTP_RAT infected computer }]
menu [running processes] [browse] [computer info] [stop httprat] [have
suggestions?] [homepage]

Type: PE32
MD5: 9729e9fc004ea49d3c2ddee28736dae3
Vuln ID: MVID-2021-0277
Disclosure: 07/03/2021

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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