Rewterz Threat Advisory – CVE-2022-30190: Follina Vulnerability (MSDT) – 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

MD5

• c2cdd28e4a8a47eb957e717c99433404

SHA-256

• ee0b391207e7683b26991bc7e5c65c26bb5eeb4460676ec8c7cdfb636fa399e7

SHA-1

• 1b97a6143b8c606baf1edf98c6cec1f4f886294c

URL

• https[:]//akmalreload[.]com/struk/wellcome[.]html
• https[:]//akmalreload[.]com/struk/project[.]exe

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
• 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.