Rewterz Threat Advisory –CVE-2022-30190: Follina MSDT Zero Day – Active IOCs

Severity

High

Analysis Summary

A zero-day vulnerability in Microsoft Office is being actively exploited in the wild, and while there isn’t currently a patch, the software giant has published workarounds to thwart attacks. CVE-2022-30190, also known as “Follina,” is a remote code execution (RCE) vulnerability affecting the Microsoft Support Diagnostic Tool (MSDT) in Windows. 

CVE-2022-30190

Microsoft Windows could allow a remote attacker to execute arbitrary code on the system, caused by a flaw in the Support Diagnostic Tool (MSDT) component. By persuading a victim to open specially-crafted content, an attacker could exploit this vulnerability to execute arbitrary code on the system. Microsoft Support Diagnostics Tool (MSDT) is used by support professionals for troubleshooting.

According to the researcher, maldoc retrieves an HTML file from a server using Word’s template feature. The malicious payload is then obtained via the “ms-msdt: //” URI scheme. 

The attackers who successfully exploit this vulnerability can run arbitrary code with the privileges of the calling application. The attacker can then install programs, view, change, delete data, or create new accounts in the context allowed by the user’s permissions.
Here are the workaround guidance shared by Microsoft:

Impact

• Code Execution
• Privilege Escalation

Indicators Of Compromise

CVE

• CVE-2022-30190

Domain Name

• web[.]sunvn[.]net

MD5

• af40791cd2403d63f8c288ed4ebeb9f6

SHA-256

• bfc9ceb09f9b08c934337036b1e3eb2eef6bfe093e0b9818a53a7c071ee5086b

SHA-1

• 40225e4c219477b6b08146064da83a723e7eafd1

Remediation

• Use Microsoft Automatic Update to apply the appropriate patch for your system, or the Microsoft Security Update Guide to search for available patches.
• Customers using Microsoft Defender Antivirus should turn-on cloud-delivered protection and automatic sample submission.
• Customers that use Microsoft Defender for Endpoint can set the “BlockOfficeCreateProcessRule” attack surface reduction rule, which prevents Office apps from generating child processes.
• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.