Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/2992b86d03c3922ed45fa09ef105f018.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Agent.bjtzcp
Vulnerability: Insecure Permissions
Description: Agent.bjtzcp creates an insecure dir named "Isrimss2018" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executables 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: 2992b86d03c3922ed45fa09ef105f018
Vuln ID: MVID-2021-0174
Disclosure: 04/17/2021

Exploit/PoC:
C:\>cacls Isrimss2018
C:\Isrimss2018 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 Isrimss2018
 Volume in drive C has no label.

 Directory of C:\Isrimss2018

12/30/2017  02:13 PM           108,544 Copia.mdb
12/12/2017  07:45 PM           112,640 DatosP.mdb
12/30/2017  02:13 PM           102,400 DatosPatron.mdb
01/20/2015  11:58 PM            37,888 Doc1F.doc
01/20/2015  11:59 PM            37,376 Doc1M.doc
01/20/2015  11:44 PM            37,888 Doc2F.doc
01/20/2015  11:45 PM            36,864 Doc2M.doc
01/21/2015  12:06 AM            37,376 Doc3F.doc
01/21/2015  12:06 AM            36,352 Doc3M.doc
01/21/2015  12:03 AM            37,376 Doc4F.doc
01/21/2015  12:04 AM            36,864 Doc4M.doc
01/25/2015  11:19 PM            46,080 Doc5F.doc
01/20/2015  11:53 PM            38,400 Doc5M.doc
01/20/2015  11:36 PM            45,056 Doc6F.doc
01/24/2015  01:23 AM            38,400 Doc6M.doc
01/20/2015  11:40 PM            37,376 Doc7F.doc
01/20/2015  11:39 PM            38,400 Doc7M.doc
01/20/2015  11:47 PM            36,864 Doc8F.doc
01/20/2015  11:48 PM            36,352 Doc8M.doc
01/20/2015  11:50 PM            37,888 Doc9F.doc
01/20/2015  11:51 PM            36,864 Doc9M.doc
03/30/2005  11:03 PM               766 impuicon.ico
01/26/2018  07:33 PM         7,551,939 ISRIMSS2018_2.CAB
02/07/2018  10:08 PM         3,821,568 ISRIMSS2018_2.exe
12/26/2015  02:18 PM            71,168 MANUALITO.doc
03/26/1999  12:00 AM           141,824 setup.exe
01/27/2018  11:44 AM             7,446 SETUP.LST
              27 File(s)     12,607,959 bytes


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