Trojan-Downloader.Win32.Delf.oxz Insecure Permissions

Trojan-Downloader.Win32.Delf.oxz malware suffers from an insecure permissions vulnerability.

MD5 | 89e753f5a34059569862bdffb0f2eb02

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Trojan-Downloader.Win32.Delf.oxz
Vulnerability: Insecure Permissions
Description: Win32.Delf.oxz 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: 373b1d95ccdbbc6531dff43bbbe43534
Vuln ID: MVID-2021-0156
Dropped files: winrao.exe
Disclosure: 04/01/2021

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

Volume in drive C has no label.

Directory of C:\RECYCLER

0 File(s) 0 bytes

C:\>attrib -s -h \RECYCLER\*

Volume in drive C has no label.

Directory of C:\RECYCLER

12/30/2019 02:34 AM 242,176 winrao.exe
1 File(s) 242,176 bytes

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