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Trojan-Dropper.Win32.Dycler.vrp MVID-2021-0135 Insecure Permissions

Trojan-Dropper.Win32.Dycler.vrp MVID-2021-0135 Insecure Permissions
Posted Mar 22, 2021
Authored by malvuln | Site malvuln.com

Trojan-Dropper.Win32.Dycler.vrp malware suffers from an insecure permissions vulnerability.

tags | exploit, trojan
systems | windows
SHA-256 | d419d0a70c54bee34fdf004edffc1f7cb5abcbbe87eb0efa654add780443518f

Trojan-Dropper.Win32.Dycler.vrp MVID-2021-0135 Insecure Permissions

Change Mirror Download
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/06cbbff745c60c46e0996928c00ef28f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Dycler.vrp
Vulnerability: Insecure Permissions
Description: Dycler.vrp creates an insecure dir named "Drivers" under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the "pir.exe" file 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: 06cbbff745c60c46e0996928c00ef28f
Vuln ID: MVID-2021-0135
Dropped files: 72 id.bat, pir.exe
Disclosure: 03/19/2021


Exploit/PoC:
C:\>cacls \Drivers
C:\Drivers 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:\Drivers\onx>dir
Volume in drive C has no label.

Directory of C:\Drivers\onx

11/02/2011 04:17 PM 72 id.bat
03/18/2021 08:17 PM <DIR> Microsoft.VC90.CRT
11/02/2011 04:15 PM 1,710,592 pir.exe
2 File(s) 1,710,664 bytes



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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