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


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