full-disclosure - [FD] Backdoor.Win32.Guptachar.20 / Insecure Credential Storage

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Message-ID: <CAAHK0WT98P1HuGkRu4YkD3UjkSoJy9E=5_VT7WwydRbnycSpAw@mail.gmail.com>
Date: Mon, 8 Aug 2022 20:58:54 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Guptachar.20 / Insecure Credential Storage

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/857999d2306f257b80d1b8f6a51ae8b0.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Guptachar.20
Vulnerability: Insecure Credential Storage
Description: The malware runs a web server on TCP port 2015 (default) and
uses BASIC authentication. The credentials "hacker01:imchampgr8" get stored
in a .NFO information file named "GPTCR.NFO" under Windows dir base64
encoded and hidden among many junk NULL bytes.
Family: Guptachar
Type: PE32
MD5: 857999d2306f257b80d1b8f6a51ae8b0
Vuln ID: MVID-2022-0631
Dropped files: GPTCR2.exe
Disclosure: 08/08/2022

Exploit/PoC:
import base64
base64.b64decode("aGFja2VyMDE6aW1jaGFtcGdyOA==")
b'hacker01:imchampgr8'

Web URLs available on the infected host.

http://192.168.18.125:2015/execute.html
http://192.168.18.125:2015/browse.html
http://192.168.18.125:2015/upload.html
http://192.168.18.125:2015/screenshot.html
http://192.168.18.125:2015/keylog.html
http://192.168.18.125:2015/display.html
http://192.168.18.125:2015/shutdown.html
http://192.168.18.125:2015/servopts.html

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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