Backdoor.Win32.Shark.btu malware suffers from an insecure permissions vulnerability.
c655d4e022fcaf26fe0ab1bc5057626705455cfc787337ad8df95d9c1fca1f2fDiscovery / 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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