Threat Signal Report

Multiple Agency Announcement on Taidoor Remote Access Trojan Malware Analysis Report (AR20-216A)

Description

Today, The United States CyberSecurity and Infrastructure Security Agency (CISA), Federal Bureau of Investigation (FBI), and the Department of Defense (DoD) released a joint report (Malware Analysis Report (AR20-216A)) on threat actors using remote access trojans and proxies to maintain a presence on the targeted victim's network. The report is related to an informational advisory published by CISA in May, "FBI-CISA PSA PRC TARGETING OF COVID-19 RESEARCH ORGANIZATIONS." This latest Malware Analysis Report (MAR) from CISA is for campaigns attributed to a threat actor and malware known as "Taidoor." Taidoor activity is attributed to Chinese government actors.

This report highlights a recently discovered campaign that is targeting multiple organizations in the United States involved in COVID-19 vaccines and treatments research. This latest announcement is not to be confused with the July 16th advisory from CISA (US)/NCSC (UK) on July 16th, also targeting organizations researching COVID-19. APT 29 aka "Cozy Bear/Duke" is attributed to Russia.

Contained within these sample sets are (4) unique samples discovered by CISA/FBI/DoD of the Taidoor remote access trojan (RAT). These samples range from the loader mechanism to the remote access trojan of Taidoor.


Why is Taidoor Significant?

First discovered in 2008, this group/family is named Taidoor due to it being first discovered attacking governmental organizations and interests in Taiwan. Taidoors' original modus operandi is to seek out targets and victims through social enginering attacks. First attacks observed were using Microsoft Word and Adobe Flash vulnerabilities, later evolving into malware being delivered via email as an attachment that would later download the Taidoor RAT. The latest advisory does not provide any information on the initial threat vector for the latest round of observed attacks. Although attacks in recent years have waned around Taidoor and that this malware family has been in existence for over a decade, the samples mentioned in today's MAR are new.


What is the Severity of Impact?

The severity should be regarded as low, due to the fact that these campaigns have been observed in limited, targeted attacks.


What is the status of AV and IPS coverage?

Customers running the latest AV definitions are protected with the following signature sets:

DATA/Taidoor.7EDD!tr

Data/Taidoor.664C!tr

W32/Taidoor.ED7B!tr

W64/Taidoor.7C1E!tr

IPS coverage is not feasible for this event.

All network IOC's are blocked by the WebFiltering client.


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.