HEUR.Trojan.Win32.Generic malware suffers from an insecure permissions vulnerability.
2a482d4c4d4e0b3ced5112d43e250ba3Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1a98a0a769e7351ba16e1b91e9f26692.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: HEUR.Trojan.Win32.Generic
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "RECYCLER" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables 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: 1a98a0a769e7351ba16e1b91e9f26692
Vuln ID: MVID-2021-0179
Dropped files: svchost2.exe
Disclosure: 04/21/2021
Exploit/PoC:
C:\>cacls RECYCLER
C:\RECYCLER 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 RECYCLER
Volume in drive C has no label.
Directory of C:\RECYCLER
06/16/2012 02:32 AM 49,152 svchost2.exe
1 File(s) 49,152 bytes
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