Trojan-Dropper.Win32.Dycler.yhb Insecure Permissions ≈ Packet Storm – Digitalmunition




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Published on March 24th, 2021 📆 | 5514 Views ⚑

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Trojan-Dropper.Win32.Dycler.yhb Insecure Permissions ≈ Packet Storm

Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/04a5a52f12d2a130bb88f98c3bc14aa8.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Dycler.yhb
Vulnerability: Insecure Permissions
Description: Dycler.yhb creates a dir named “RECYCLER” under c: drive and grants change (C) permissions to the authenticated user group. Standard users can rename the “cft_mon.exe” 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: 04a5a52f12d2a130bb88f98c3bc14aa8
Vuln ID: MVID-2021-0140
Dropped files: cft_mon.exe
Disclosure: 03/23/2021

Exploit/PoC:
C:>cacls RECYCLER
C:RECYCLER BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

C:>cd RECYCLER

C:RECYCLER>dir /a
Volume in drive C has no label.

Directory of C:RECYCLER

06/17/2012 01:56 AM 463,591 cft_mon.exe
1 File(s) 463,591 bytes

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