full-disclosure - [FD] BuilderOrcus (Orcus.Administration-cracked.exe) / Insecure Permissions

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Message-ID: <CAAHK0WRQvifmKkfrP0e02DRAEbdjsJixypC+M5rvVtMirjbVBw@mail.gmail.com>
Date: Thu, 17 Mar 2022 13:00:01 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] BuilderOrcus (Orcus.Administration-cracked.exe) / Insecure
	Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/cc3670f1b3e60e00b43c86d787563a44.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: BuilderOrcus (Orcus.Administration-cracked.exe)
Vulnerability: Insecure Permissions
Description: When building backdoor servers, the malware writes PE files
with insecure permissions 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.
Family: BuilderOrcus
Type: PE32
MD5: cc3670f1b3e60e00b43c86d787563a44
Vuln ID: MVID-2022-0515
Disclosure: 03/17/2022

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

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

 Directory of C:\

03/15/2022  11:40 PM         3,366,040 Orcus.Server.exe
               1 File(s)      3,366,040 bytes

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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