Tuesday, January 25, 2022

CosaNostra Builder Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/61285c988de52b7c067fb2e703f2ab83.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: CosaNostra Builder
Vulnerability: Insecure Permissions
Description: The malware creates PE files with insecure permissions when writing 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.
Type: PE32
MD5: 61285c988de52b7c067fb2e703f2ab83
Vuln ID: MVID-2022-0471
Disclosure: 01/24/2022

C:\>cacls hate.exe
C:\hate.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\Authenticated Users:(ID)C

C:\>dir hate.exe
Volume in drive C has no label.

Directory of C:\

01/23/2022 11:37 PM 112,140 hate.exe
1 File(s) 112,140 bytes
0 Dir(s) 27,572,977,664 bytes free

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore