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BuilderOrcus Insecure Permissions

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022030069

Below is a copy:

BuilderOrcus Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/cc3670f1b3e60e00b43c86d787563a44.txt
Contact: [email protected]
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


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