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HEUR.Hoax.Win32.FrauDrop.gen MVID-2021-0170 Insecure Permissions

HEUR.Hoax.Win32.FrauDrop.gen MVID-2021-0170 Insecure Permissions
Posted Apr 14, 2021
Authored by malvuln | Site malvuln.com

HEUR.Hoax.Win32.FrauDrop.gen malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
SHA-256 | 41b968222d8773d20c8b3317a23d105cd36326de7b48f2a0ad6dcfe751c1c099

HEUR.Hoax.Win32.FrauDrop.gen MVID-2021-0170 Insecure Permissions

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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1d40e72fb8cf300298df4b828b48ec29.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: HEUR.Hoax.Win32.FrauDrop.gen
Vulnerability: Insecure Permissions
Description: FrauDrop.gen creates an insecure dir named "newdnswatch" 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: 1d40e72fb8cf300298df4b828b48ec29
Vuln ID: MVID-2021-0170
Dropped files: config.bin, newdnswatch.exe
Disclosure: 04/13/2021

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

Directory of C:\newdnswatch

04/11/2021 10:13 PM 5,677 config.bin
02/10/2018 01:21 AM 131,072 newdnswatch.exe
2 File(s) 136,749 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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