full-disclosure - [FD] Backdoor.Win32.Shark.btu / Insecure Permissions

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Message-ID: <CAAHK0WQTBRtWodAp2DkMn-XHGqgUk7XDZtRW51PM9Sav+yvbMw@mail.gmail.com>
Date: Thu, 23 Jun 2022 22:30:24 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Shark.btu / Insecure Permissions

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/5a83f8b8c8a8b7a85b3ff632aa60e793.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Shark.btu
Vulnerability: Insecure Permissions
Description:  The malware writes multiple PE files to c drive granting
change (C) permissions to the authenticated user group. Standard users can
rename the executable 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.
Family: Shark
Type: PE32
MD5: 5a83f8b8c8a8b7a85b3ff632aa60e793
Vuln ID: MVID-2022-0615
Disclosure: 06/23/2022

Exploit/PoC:
C:\Fraps 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 Fraps
 Volume in drive C has no label.

 Directory of C:\Fraps

01/14/2008  08:12 AM            12,988 changes.txt
01/14/2008  08:51 AM           172,032 fraps.dll
01/14/2008  08:53 AM           913,064 fraps.exe
01/14/2008  08:51 AM         1,683,968 fraps64.dat
01/14/2008  08:51 AM           111,616 fraps64.dll
01/14/2008  08:51 AM           135,168 frapslcd.dll
05/12/2022  02:02 AM    DIR           HELP
01/14/2008  08:07 AM             1,841 README.HTM
05/12/2022  02:02 AM            34,552 uninstall.exe
               8 File(s)      3,065,229 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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