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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