Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/ff6516c881dee555b0cd253408b64404.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Zombam.gen
Vulnerability: Cross Site Scripting (XSS)
Description: Zombam malware listens on TCP port 80 and deploys a HTML Web UI for basic remote administration capability. One feature lists running processes on the infected host using a GET request for /proc URL. 

E.g.

{ welcome 2 HTTP_RAT infected computer }

menu [running processes] [browse] [computer info] [stop httprat] [have suggestions?] [homepage]

running processez

[System Process]
System [kill]
smss.exe [kill]
csrss.exe [kill]
wininit.exe [kill]
csrss.exe [kill]
winlogon.exe [kill]

The malware fails to sanitize the URL and echoes back user controlled input for the running processes webpages /proc menu link. Third-party attackers can craft malicious HTML links to execute client side code in the security context of the current user if they visit a malicious server or click the infected link. 

Type: PE32
MD5: ff6516c881dee555b0cd253408b64404
Vuln ID: MVID-2021-0243
Disclosure: 06/10/2021

Exploit/PoC:
http://x.x.x.x/%3Cscript%3Ealert(%22HYP3RLINX%22)%3C/script%3E&jusched.exe&


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