HEUR.Trojan.Win32.Generic malware suffers from an insecure permissions vulnerability.
7e44423a21645ab3d356add5d8025772Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/a6916fb9b824e3d2edfe46be69ca2501.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: HEUR.Trojan.Win32.Generic
Vulnerability: Insecure Permissions
Description: The malware creates an dir with insecure permissions under c:\ drive and grants 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.
Type: PE32
MD5: a6916fb9b824e3d2edfe46be69ca2501
Vuln ID: MVID-2021-0338
Dropped files: B6232F3A578.exe, 44160A754B496CC
Disclosure: 09/09/2021
Exploit/PoC:
C:\>cacls Recycle.Bin
C:\Recycle.Bin 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:\>cd Recycle.Bin
C:\Recycle.Bin>dir
Volume in drive C has no label.
Directory of C:\Recycle.Bin
09/01/2021 02:05 AM 9,004 44160A754B496CC
02/10/2018 01:21 AM 204,800 B6232F3A578.exe
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