Worm.Win32.Ngrbot.abpr Insecure Permissions ≈ Packet Storm – Digitalmunition




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Published on March 27th, 2021 📆 | 7656 Views ⚑

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Worm.Win32.Ngrbot.abpr Insecure Permissions ≈ Packet Storm

Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/ed1e47f62fa93f2fd2f4fbcfdd0f1c10.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Worm.Win32.Ngrbot.abpr
Vulnerability: Insecure Permissions
Description: Ngrbot.abpr creates a dir named “Win.Msi” under c: drive and grants change (C) permissions to the authenticated user group. Standard users can rename several of 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: ed1e47f62fa93f2fd2f4fbcfdd0f1c10
Vuln ID: MVID-2021-0142
Dropped files: alg.exe, cssrs.exe, System.exe,
Disclosure: 03/24/2021

Exploit/PoC:
C:>cacls C:Win.Msi
C:Win.Msi 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 Win.Msi

C:Win.Msi>dir
Volume in drive C has no label.

Directory of C:Win.Msi

05/30/2008 12:25 PM 132 3proxy.cfg
12/06/2011 11:56 AM 184,832 alg.exe
12/06/2011 11:59 AM 315,392 cssrs.exe
10/17/2011 12:37 PM 494 DiskDoctor.lnk
04/17/2009 07:40 AM 330,752 System.exe
5 File(s) 831,602 bytes
0 Dir(s) 15,876,706,304 bytes free

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