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Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021070113

Below is a copy:

HEUR.Backdoor.Win32.Winnti.gen / Insecure Permissions
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/eb272fe923ccf3e66fde1bf309cbc464.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: HEUR.Backdoor.Win32.Winnti.gen
Vulnerability: Insecure Permissions
Description: The malware creates a dir with insecure permissions under c:\ drive and grants 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: eb272fe923ccf3e66fde1bf309cbc464
Vuln ID: MVID-2021-0296
Disclosure: 07/18/2021


Exploit/PoC:
C:\>cacls tmp
C:\tmp BUILTIN\Administrators:(OI)(CI)(ID)F
       NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
       BUILTIN\Users:(OI)(CI)(ID)R
       NT AUTHORITY\Authenticated Users:(ID)C
       NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C


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

 Directory of C:\tmp

07/13/2021  02:09 AM            77,224 DaumCleans.exe
               1 File(s)         77,224 bytes


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