Email-Worm.Win32.Trance.a Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/ca18a07560efa0308827dc972351301f.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Email-Worm.Win32.Trance.a  
Vulnerability: Insecure Permissions  
Description: The malware creates a dir named "DCA" and VBS file "log.vbs" 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: ca18a07560efa0308827dc972351301f  
Vuln ID: MVID-2021-0261  
Dropped files: log.vbs, zip.exe  
Disclosure: 06/25/2021  
  
  
Exploit/PoC:  
C:\>cacls log.vbs  
C:\log.vbs BUILTIN\Administrators:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Users:(ID)R  
NT AUTHORITY\Authenticated Users:(ID)C  
  
  
C:\>cacls DCA  
C:\DCA 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 DCA  
Volume in drive C has no label.  
  
Directory of C:\DCA  
  
06/16/2021 01:45 AM 67,072 zip.exe  
1 File(s) 67,072 bytes  
  
  
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