Email-Worm.Win32.Trance.a Insecure Permissions

Email-Worm.Win32.Trance.a malware suffers from an insecure permissions vulnerability.

MD5 | fb45ce08d60cf295aac4ffd68c5e2a8b

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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

C:\>cacls log.vbs
C:\log.vbs BUILTIN\Administrators:(ID)F
NT AUTHORITY\Authenticated Users:(ID)C

C:\>cacls DCA
C:\DCA BUILTIN\Administrators:(OI)(CI)(ID)F
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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