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Edit Report

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022040104

Below is a copy:

Trojan-Downloader.Win32.Agent / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/fb3ac3c9d808de7f4b5ede68715f658f.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Downloader.Win32.Agent
Vulnerability: Insecure Permissions
Description: The malware writes a PE file to the "Windows\System" directory 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: Agent
Type: PE32
MD5: fb3ac3c9d808de7f4b5ede68715f658f
Vuln ID: MVID-2022-0570
Dropped files: alg.exe
Disclosure: 04/26/2022 

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

C:\>dir \Windows\System\alg.exe
 Volume in drive C has no label.

 Directory of C:\Windows\System

04/10/2022  01:18 AM           882,688 alg.exe
               1 File(s)        882,688 bytes


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