full-disclosure - [FD] Trojan.Win32.Agent.xdtv / Insecure Permissions

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Date: Tue, 4 May 2021 22:12:50 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Agent.xdtv / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ffa9b76f9549a2c46415c855a0911e8a.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Agent.xdtv
Vulnerability: Insecure Permissions
Description: The malware creates an insecure installation dir under
"C:\Program Files (x86)" and grants full (F) permissions to the Everyone
user group. Standard users can rename the executables dropped by the
malware to disable it or replace it with their own executable. Then wait
for a privileged user to logon to the infected machine to potentially
escalate privileges.
Type: PE32
MD5: ffa9b76f9549a2c46415c855a0911e8a
Vuln ID: MVID-2021-0198
Disclosure: 05/04/2021

Exploit/PoC:
C:\>cacls "C:\Program Files (x86)\Cannonnt"
C:\Program Files (x86)\Cannonnt Everyone:(OI)(CI)F

C:\>cd "\Program Files (x86)\Cannonnt"

C:\Program Files (x86)\Cannonnt>dir
 Volume in drive C has no label.

 Directory of C:\Program Files (x86)\Cannonnt

05/10/2012  05:04 PM            53,248 messenger.exe
05/10/2012  05:04 PM           122,880 rdbms.exe
05/10/2012  05:04 PM           196,608 RDS.exe
05/10/2012  05:04 PM           233,472 windns.exe
               4 File(s)        606,208 bytes

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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