full-disclosure - [FD] Trojan-Spy.Win32.Ardamax.ocx / Insecure Permissions

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Date: Fri, 15 Oct 2021 13:35:56 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Spy.Win32.Ardamax.ocx / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/78a39875a0adb110cf3c7de3a0d1384c.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Spy.Win32.Ardamax.ocx
Vulnerability: Insecure Permissions
Description: The malware creates an dir named "MUWOCI" or "28463" with
insecure permissions under Windows\SysWOW64 granting full (F) permissions
to the Everyone 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: 78a39875a0adb110cf3c7de3a0d1384c
Vuln ID: MVID-2021-0362
Disclosure: 10/15/2021

Exploit/PoC:
C:\Windows\SysWOW64\MUWOCI>cacls HNI.001
C:\Windows\SysWOW64\MUWOCI\HNI.001 Everyone:(ID)F

C:\Windows\SysWOW64\MUWOCI>cd ..

C:\Windows\SysWOW64>cacls MUWOCI

C:\Windows\SysWOW64\MUWOCI Everyone:F
                           Everyone:(OI)(CI)(IO)F

C:\Windows\SysWOW64>dir MUWOCI
 Volume in drive C has no label.

 Directory of C:\Windows\SysWOW64\MUWOCI

10/05/2021  10:11 PM            62,464 HNI.001
               1 File(s)         62,464 bytes

C:\Windows\SysWOW64>cacls 28463
C:\Windows\SysWOW64\28463 Everyone:F
                          Everyone:(OI)(CI)(IO)F

C:\Windows\SysWOW64>dir 28463
 Volume in drive C has no label.

 Directory of C:\Windows\SysWOW64\28463

10/05/2021  10:17 PM           402,944 AKV.exe
10/05/2021  10:17 PM               482 DQOC.001
10/05/2021  10:17 PM             7,680 DQOC.006
10/05/2021  10:17 PM             5,632 DQOC.007
10/05/2021  10:17 PM           483,840 DQOC.exe
               5 File(s)        900,578 bytes

C:\Windows\SysWOW64>cacls 28463
C:\Windows\SysWOW64\28463 Everyone:F
                          Everyone:(OI)(CI)(IO)F

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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