WORM.WIN32.DELF.HU / Insecure Permissions

CVE Category Price Severity
N/A CWE-266 Not specified High
Author Risk Exploitation Type Date
Unknown High Remote 2021-04-30
CVSS:4.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C/CDP:H/TD:H/CR:H/IR:H/AR:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

WORM.WIN32.DELF.HU / Insecure Permissions
Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Vulnerability: Insecure Permissions
Description: The malware creates a hidden 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: 46e27d7bfdbda7a71dfa12a79026a88b
Vuln ID: MVID-2021-0192
Dropped ok.exe,
Disclosure: 04/29/2021

C:\>dir /a RECYCLER
 Volume in drive C has no label.

 Directory of C:\RECYCLER

06/16/2012  12:21 AM           449,024 ok.exe
06/16/2012  09:55 AM            61,952
               2 File(s)        510,976 bytes
               2 Dir(s)  23,871,930,368 bytes free

C:\>cacls RECYCLER
C:\RECYCLER BUILTIN\Administrators:(OI)(CI)(ID)F
            NT AUTHORITY\Authenticated Users:(ID)C
            NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C

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