Full Disclosure: Trojan.Win32.VB.bcng / Insecure Permissions

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Trojan.Win32.VB.bcng / Insecure Permissions

From: malvuln <malvuln13 () gmail com>
Date: Sat, 3 Jul 2021 17:35:55 -0400

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Trojan.Win32.VB.bcng
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: 10550ca42c32c22bdd0515020cff38dd
Vuln ID: MVID-2021-0272
Dropped files: logs.exe,
Disclosure: 07/03/2021

C:>cacls .exe
C:.exe BUILTINAdministrators:(ID)F
        NT AUTHORITYAuthenticated Users:(ID)C

C:>cacls Intel
C:Intel BUILTINAdministrators:(OI)(CI)(ID)F
         NT AUTHORITYAuthenticated Users:(ID)C
         NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

C:>dir Intellogs
 Volume in drive C has no label.

 Directory of C:Intellogs

07/13/2012  02:52 AM           274,432 logs.exe
               1 File(s)        274,432 bytes
               3 Dir(s)   7,953,518,592 bytes free

C:>dir IntellogsChip
 Volume in drive C has no label.

 Directory of C:IntellogsChip

06/28/2021  03:29 AM               988
06/28/2021  03:29 AM               310
               2 File(s)          1,298 bytes

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provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
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the author. The author is not responsible for any misuse of the information
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use or misuse of this information. The author prohibits any malicious use
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not attempt to download Malware samples. The author of this website takes
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handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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