full-disclosure - [FD] Trojan-Spy.Win32.Stealer.osh / Insecure Permissions

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Message-ID: <CAAHK0WRLAa6Qhbd4Xxy4km9quaj=nNxkZwKN+6+Pg08qYnY2=w@mail.gmail.com>
Date: Mon, 1 Mar 2021 10:22:22 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Spy.Win32.Stealer.osh / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/d58b1c2f540268bd9dd920455568d45f.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.Stealer.osh
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "DESKTOP-2C3IQHO"
under c:\ drive and grants change (C) permissions to the authenticated user
group. Standard users can rename the malware and reboot to disable it or
replace with their own executable to escalate privileges when a privileged
user logs on to the infected machine.
Type: PE32
MD5: d58b1c2f540268bd9dd920455568d45f
Vuln ID: MVID-2021-0117
Dropped files: ApiSetHost.AppExecutionAlias.exe
Disclosure: 03/1/2021

Exploit/PoC:
C:\>cacls \DESKTOP-2C3IQHO\scp
C:\DESKTOP-2C3IQHO\scp BUILTIN\Administrators:(OI)(CI)(ID)F
                       NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
                       BUILTIN\Users:(OI)(CI)(ID)R
                       NT AUTHORITY\Authenticated Users:(ID)C
                       NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

C:\>dir \DESKTOP-2C3IQHO\scp
 Volume in drive C has no label.

 Directory of C:\DESKTOP-2C3IQHO\scp

02/23/2021  07:41 PM         1,238,020 ApiSetHost.AppExecutionAlias.exe
               1 File(s)      1,238,020 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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