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https://winbuzzer.com/2021/12/15/microsoft-december-2021-patch-tuesday-brings-fix-for-active-exploit-zero-day-xcxwbn/
Submission: On December 16 via api (December 16th 2021, 1:06:51 pm UTC) from US — Scanned from FR

Form analysis
3 forms found in the DOM

GET https://winbuzzer.com/

<form method="get" class="td-search-form" action="https://winbuzzer.com/">
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GET https://winbuzzer.com/

<form method="get" class="td-search-form-widget" action="https://winbuzzer.com/">
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Home WinBuzzer News Microsoft December 2021 Patch Tuesday Brings Fix for Active
Emotet Exploit Zero-Day
 * WinBuzzer News


MICROSOFT DECEMBER 2021 PATCH TUESDAY BRINGS FIX FOR ACTIVE EMOTET EXPLOIT
ZERO-DAY

Microsoft’s December 2021 Patch Tuesday tackles remerging Emotet malware that is
targeting a Windows AppX Installer Vulnerability.

By
Luke Jones
-
December 15, 2021 3:16 pm CET
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Microsoft rolled out its December 2021 Patch Tuesday updates yesterday. As
usual, dozens of fixes (67 in total) were included in the cumulative updates,
including one for a zero-day vulnerability that is already being exploited in
the wild.

This flaw is concerning because it sends the Emotet Trickbot to unsuspecting
users through a fake application. Microsoft has been tracking the vulnerability
as CVE-2021-43890 and given it an “important” rating.

Microsoft describes the problem as a spoofing vulnerability found in the Windows
AppX Installer. This means it affects Windows 10 apps. Windows AppX Installer is
available from the App Store an allows users to side-load Windows applications.

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Attackers can exploit the vulnerability by creating a package file and modifying
it to look like a real application. Instead, it is loaded with the Emotet
trickbot malware.

Yes, that’s the same Emotet that Microsoft declared war on and removed earlier
this year. However, it has since made a comeback. Emotet is a relatively old and
solvable trojan that has been around since 2014. However, threat actors have
evolved the botnet to become the most dangerous in circulation.

It is used by a threat group known as Mummy Spider (TA542) to deploy other
malware types such as Trickbot.


FIX

Microsoft says the December 2021 Patch Tuesday fix should shore app Windows AppX
Installer and fake packages will no longer appear legitimate. However, the
company points out the patch does not stop the threat actors from sending the
files.

The Patch Tuesday Cumulative updates for December 2021 are rolling out now.
Amongst the 67 fixes are patches covering vulnerabilities in Microsoft Edge,
Microsoft Office, SharePoint, Windows, Azure Bot Framework SDK, Visual Studio,
ASP.NET Core, Microsoft Defender for IoT, and more.

Tip of the day: Whether it’s for a presentation, song, or YouTube video, at some
point in your life you’ll need to record audio from your computer. Windows 11
has multiple options to record sound due to its litany of apps. In our tutorial,
we show you how to record audio using the built-in Windows 10 Voice Recorder and
the freeware audio editor Audacity.

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SOURCEMicrosoft Security
 * TAGS
 * App Store
 * Cybersecurity
 * December 2021 Patch Tuesday
 * Emotet
 * Microsoft Security
 * Windows
 * Windows 10
 * Windows AppX Installer

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Previous articleMicrosoft Teams End-to-End Encryption for One-to-One Calls
Arrives with Compromises

Luke Jones
Luke has been writing about all things tech for more than five years. He is
following Microsoft closely to bring you the latest news about Windows, Office,
Azure, Skype, HoloLens and all the rest of their products.



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winbuzzer.com Open in urlscan Pro 2a00:1158:5:79c:: Public Scan

Form analysis 3 forms found in the DOM

GET https://winbuzzer.com/

POST #

GET https://winbuzzer.com/

Text Content

winbuzzer.com Open in urlscan Pro
2a00:1158:5:79c:: Public Scan

Form analysis
3 forms found in the DOM