Tuesday, January 18, 2022

Chaos Ransomware Builder 4 Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/8b855e56e41a6e10d28522a20c1e0341.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Chaos Ransomeware Builder v4
Vulnerability: Insecure Permissions
Description: The malware writes an .EXE with insecure permissions under 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: 8b855e56e41a6e10d28522a20c1e0341
Vuln ID: MVID-2022-0456
Disclosure: 01/16/2022

Exploit/PoC:
C:\>cacls hate.exe
C:\hate.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C

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

Directory of C:\

01/11/2022 10:08 PM 23,040 hate.exe
1 File(s) 23,040 bytes

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