The Future of Zero Trust and SASE is Now! Register now

close
close
The platform of the future is Netskope

Intelligent Security Service Edge (SSE), Cloud Access Security Broker (CASB), Cloud Firewall, Next Generation Secure Web Gateway (SWG), and Private Access for ZTNA built natively into a single solution to help every business on its journey to Secure Access Service Edge (SASE) architecture.

Go to Products Overview
Netskope video
Next Gen SASE Branch is hybrid — connected, secured, and automated

Netskope Next Gen SASE Branch converges Context-Aware SASE Fabric, Zero-Trust Hybrid Security, and SkopeAI-powered Cloud Orchestrator into a unified cloud offering, ushering in a fully modernized branch experience for the borderless enterprise.

Learn about Next Gen SASE Branch
People at the open space office
Designing a SASE Architecture For Dummies

Get your complimentary copy of the only guide to SASE design you’ll ever need.

Get the eBook
Embrace a Secure Access Service Edge (SASE) architecture

Netskope NewEdge is the world’s largest, highest-performing security private cloud and provides customers with unparalleled service coverage, performance and resilience.

Learn about NewEdge
NewEdge
Your Network of Tomorrow

Plan your path toward a faster, more secure, and more resilient network designed for the applications and users that you support.

Get the white paper
Your Network of Tomorrow
Netskope Cloud Exchange

The Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.

Learn about Cloud Exchange
Netskope video
Make the move to market-leading cloud security services with minimal latency and high reliability.

Learn about NewEdge
Lighted highway through mountainside switchbacks
Safely enable the use of generative AI applications with application access control, real-time user coaching, and best-in-class data protection.

Learn how we secure generative AI use
Safely Enable ChatGPT and Generative AI
Zero trust solutions for SSE and SASE deployments

Learn about Zero Trust
Boat driving through open sea
Netskope achieves FedRAMP High Authorization

Choose Netskope GovCloud to accelerate your agency’s transformation.

Learn about Netskope GovCloud
Netskope GovCloud
  • Resources chevron

    Learn more about how Netskope can help you secure your journey to the cloud.

  • Blog chevron

    Learn how Netskope enables security and networking transformation through security service edge (SSE).

  • Events & Workshops chevron

    Stay ahead of the latest security trends and connect with your peers.

  • Security Defined chevron

    Everything you need to know in our cybersecurity encyclopedia.

Security Visionaries Podcast

Cookies, Not Biscuits
Host Emily Wearmouthas sits down with experts David Fairman and Zohar Hod to discuss the past, present, and future of internet cookies.

Play the podcast
Podcast: Cookies, Not Biscuits
Latest Blogs

How Netskope can enable the Zero Trust and SASE journey through security service edge (SSE) capabilities.

Read the blog
Sunrise and cloudy sky
SASE Week 2023: Your SASE journey starts now!

Replay sessions from the fourth annual SASE Week.

Explore sessions
SASE Week 2023
What is Security Service Edge?

Explore the security side of SASE, the future of network and protection in the cloud.

Learn about Security Service Edge
Four-way roundabout
We help our customers to be Ready for Anything

See our Customers
Woman smiling with glasses looking out window
Netskope’s talented and experienced Professional Services team provides a prescriptive approach to your successful implementation.

Learn about Professional Services
Netskope Professional Services
The Netskope Community can help you and your team get more value out of products and practices.

Go to the Netskope Community
The Netskope Community
Secure your digital transformation journey and make the most of your cloud, web, and private applications with Netskope training.

Learn about Training and Certifications
Group of young professionals working
  • Company chevron

    We help you stay ahead of cloud, data, and network security challenges.

  • Why Netskope chevron

    Cloud transformation and work from anywhere have changed how security needs to work.

  • Leadership chevron

    Our leadership team is fiercely committed to doing everything it takes to make our customers successful.

  • Partners chevron

    We partner with security leaders to help you secure your journey to the cloud.

Supporting sustainability through data security

Netskope is proud to participate in Vision 2045: an initiative aimed to raise awareness on private industry’s role in sustainability.

Find out more
Supporting Sustainability Through Data Security
Highest in Execution. Furthest in Vision.

Netskope recognized as a Leader in the 2023 Gartner® Magic Quadrant™ for Security Service Edge.

Get the report
Netskope recognized as a Leader in the 2023 Gartner® Magic Quadrant™ for Security Service Edge.
Thinkers, builders, dreamers, innovators. Together, we deliver cutting-edge cloud security solutions to help our customers protect their data and people.

Meet our team
Group of hikers scaling a snowy mountain
Netskope’s partner-centric go-to-market strategy enables our partners to maximize their growth and profitability while transforming enterprise security.

Learn about Netskope Partners
Group of diverse young professionals smiling

CVE-2022-30190: New Zero-Day Vulnerability (Follina) in Microsoft Support Diagnostic Tool

Jun 01 2022

Gustavo Palazolo and Ghanashyam Satpathy

Summary

On May 27, 2022, a Microsoft Office document was submitted from Belarus to VirusTotal, using a novel method to deliver its payload. This new technique was identified as a Zero-Day RCE (Remote Code Execution) vulnerability in Microsoft Support Diagnostic Tool (MSDT), which is now being tracked as CVE-2022-30190. As of this writing, it affects only Windows computers running with MSDT URI protocol enabled. 

The methods of execution and net result of this vulnerability continue to expand as it gains more attention, similar to what we observed with Log4j. CVE-2022-30190 is also being called Follina, because the sample uploaded to VirusTotal references 0438, which is the area code for Follina in Italy.

This vulnerability does not require any macros, which are now disabled by default on files downloaded from the internet. The exploit can be achieved through crafted URLs that use the ms-msdt URL protocol, which will eventually load and execute code. The attack surface for MSDT Protocol in Office is also quite large. Furthermore, the document spotted on May 27 is using Living-off-the-Land techniques by abusing “msdt.exe” and “certutil.exe” binaries. At this point, there are a few public PoCs created by security researchers available on GitHub.

Microsoft has released a few workarounds users can implement to be protected against this vulnerability. The official fix has not yet been released.

CVE-2022-30190

In this analysis, we created a non-weaponized sample using one of the public PoCs available on GitHub, to demonstrate how it works.

Like CVE-2021-40444, the document may trigger the vulnerability by abusing the OOXML relationships to automatically download the content from an external URL. In this case, the URL is pointing to localhost as we are using the PoC code.

Malicious URL embedded in the document.

When the document is opened, the URL content is automatically downloaded.

Word document loading the external HTML page.

If the file was downloaded from the internet, the code is not executed because of the Protected View. The exploit will only be triggered if the user clicks the “Enable Editing” button. However, it seems that this vulnerability can be exploited via RTF files, where the Protected View does not apply, making this a zero-click vulnerability. Also, the vulnerability can be exploited if the user previews the document inside the Windows Explorer, where the Protected View concept does not apply.

Microsoft Protected View.

The HTML page contains a script that just redirects the user to the URL that will trigger the exploit.

HTML payload that triggers CVE-2022-30190.

In this example, the “msdt.exe” will spawn the Windows calculator through the following PowerShell command, which is encoded with base64:

Start-Process c:\windows\system32\calc.exe -WindowStyle hidden

Conclusion

This vulnerability shows that attackers are constantly trying to abuse Microsoft Office documents to execute code, especially after Microsoft disabled the VBA macros by default on files downloaded from the internet. This new vulnerability (CVE-2022-30190) does not require any VBA macros to exploit devices, and it’s currently being used in the wild by attackers. Furthermore, we also see other attackers, like Emotet, changing their TTPs to circumvent the latest Microsoft protections.

Protection

Netskope Threat Labs is actively monitoring this campaign and will ensure coverage for all known threat indicators and payloads.

  • Netskope Threat Protection
    • Document-Word.Exploit.CVE-2022-30190
    • Document-Word.Downloader.Heuristic
  • Netskope Advanced Threat Protection provides proactive coverage against this threat.
    • Gen.Malware.Detect.By.StHeur indicates a sample that was detected using static analysis
    • Gen.Malware.Detect.By.Sandbox indicates a sample that was detected by our cloud sandbox

Update / Patch

Microsoft has released a few workarounds that can be implemented against CVE-2022-30190, such as disabling MSDT URL protocol. This can be achieved in multiple ways, such as:

1. By deleting its Windows registry key. 

This can be done by running the following command in an administrator command prompt:

“reg delete HKEY_CLASSES_ROOT\ms-msdt /f”

2. By disabling “Troubleshooting wizards”

Either through Registry:

HKLM\SOFTWARE\Policies\Microsoft\Windows\ScriptedDiagnostics – EnableDiagnostics – 0

Or in the user interface:

Group Policy Editor -> Computer Configuration -> Administrative Templates -> System -> Troubleshooting and Diagnostics -> Scripted Diagnostics. 

Set “Troubleshooting:
Allow users to access and run Troubleshooting Wizards” to “disabled”.

3. Disabling Preview in Windows Explorer.

This can be done by opening file explorer and selecting the view followed by selecting “preview pane” to hide it. 

IOCs

MD5 Hashes

f531a7c270d43656e34d578c8e71bc39
6bcee92ab337c9130f27143cc7be5a55
529c8f3d6d02ba996357aba535f688fc

SHA256 Hashes

710370f6142d945e142890eb427a368bfc6c5fe13a963f952fb884c38ef06bfa
fe300467c2714f4962d814a34f8ee631a51e8255b9c07106d44c6a1f1eda7a45
d61d70a4d4c417560652542e54486beb37edce014e34a94b8fd0020796ff1ef7

URLs

hxxps://www.sputnikradio[.]net/radio/news/3134.html
hxxps://exchange.oufca[.]com.au/owa/auth/15.1.2375/themes/p3azx.html

author image
Gustavo Palazolo
Gustavo Palazolo is an expert in malware analysis, reverse engineering and security research, working many years in projects related to electronic fraud protection. He is currently working on the Netskope Research Team, discovering and analyzing new malware threats.

Stay informed!

Subscribe for the latest from the Netskope Blog