Backdoor.Win32.Shark.btu / Insecure Permissions

2022.06.26
us malvuln (US) us
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

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 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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