Threat Signal Report

Qakbot Delivered Through CVE-2022-30190 (Follina)

description-logo Description

FortiGuard Labs is aware of a report that CVE-2022-30190 is exploited in the wild to deliver Qakbot malware. Currently, a patch is not available for CVE-2022-30190. Also known as Qbot and Pinkslipbot, Qakbot started off as a banking malware. In recent years, Qakbot was seen as a delivery vehicle for other malware, which often results in a compromised machine being infected with ransomware.


Why is this Significant?

This is significant because CVE-2022-30190 is a Windows vulnerability that has no available patch and is being abused in the field. The current attack campaign delivers Qakbot to victim's machine. While final payload has not been identified nor reported, often Qakbot infection leads to ransomware deployed to the compromised machine. A publicly available report suggests Black Basta ransomware was deployed through Qakbot.



What is CVE-2022-30190?

CVE-20022-30190, also known as Follina, is a vulnerability in Microsoft Support Diagnostic Tool, which uccessful exploitation allows an attacker to run arbitrary code with the privileges of the calling application. FortiGuard Labs previously released Outbreal Alert and Threat Signal on CVE-2022-30190. See the Appendix for links to "MSDT Follina" and "Follina: 0-day Windows MSDT Vulnerability (CVE-2022-30190) Exploited In The Wild".



How does the Current Qakbot Campaign Work?

Reportedly, malicious emails arrive with an HTML attachment. Opening the HTML attachment downloads and saves a .zip file that an inner IMG file inside. The IMG file contains a DLL, a Word document, and a .LNK file. The DLL is a Qakbot variant which the link file will execute. Alternatively, the Word file will download and execute a remote HTML file, which has a script to abuse CVE-2022-30190, which then download and execute a Qakbot variant.



What is the Status of Coverage?

FortiGuard Labs provides the following AV coverage against available samples associated with the current Qakbot campaign that abuses CVE-2022-30190:


W32/Qbot.DM!tr

MSOffice/CVE_2021_40444.A!tr

LNK/Agent.BD!tr

HTML/CVE_2022_30190.A!tr


Regarding IPS coverage, the following signature will detect the retrieval of remote HTML files that contain the MSDT command:

MS.Office.MSHTML.Remote.Code.Execution.


Known network IOCs for CVE-2022-30190 are blocked by the WebFiltering client.


FortiEDR will provide protection from exploitation of this vulnerability and subsequent post-exploitation activity. See the Appendix for a link to "Technical Tip: How FortiEDR protects against CVE-2022-30190 'Follina' Microsoft Office protocol vulnerability" for more information.


Th FortiGuard Content Disarm and Reconstruction (CDR) service can detect the attack in real-time and prevent it by disarming the "oleobject" data from Microsoft Office files.


Definitions

Traffic Light Protocol

Color When Should it Be used? How may it be shared?

TLP: RED

Not for disclosure, restricted to participants only.
Sources may use TLP:RED when information cannot be effectively acted upon by additional parties, and could lead to impacts on a party's privacy, reputation, or operations if misused. Recipients may not share TLP:RED information with any parties outside of the specific exchange, meeting, or conversation in which it was originally disclosed. In the context of a meeting, for example, TLP:RED information is limited to those present at the meeting. In most circumstances, TLP:RED should be exchanged verbally or in person.

TLP: AMBER

Limited disclosure, restricted to participants’ organizations.
Sources may use TLP:AMBER when information requires support to be effectively acted upon, yet carries risks to privacy, reputation, or operations if shared outside of the organizations involved. Recipients may only share TLP:AMBER information with members of their own organization, and with clients or customers who need to know the information to protect themselves or prevent further harm. Sources are at liberty to specify additional intended limits of the sharing: these must be adhered to.

TLP: GREEN

Limited disclosure, restricted to the community.
Sources may use TLP:GREEN when information is useful for the awareness of all participating organizations as well as with peers within the broader community or sector. Recipients may share TLP:GREEN information with peers and partner organizations within their sector or community, but not via publicly accessible channels. Information in this category can be circulated widely within a particular community. TLP:GREEN information may not be released outside of the community.

TLP: WHITE

Disclosure is not limited.
Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction.