Backdoor.Win32.Shark.btu MVID-2022-0615 Insecure Permissions

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/5a83f8b8c8a8b7a85b3ff632aa60e793.txt  
Contact: [email protected]  
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  
  
  
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