Threat Signal Report

New Remote Access Trojan FatalRAT distributed through Telegram and forums


FortiGuard Labs is aware of a report that FatalRAT is being distributed through forums and Telegram channels. FatalRAT is a Remote Access Trojan (RAT) that disables the Windows feature to lock the computer by using a keyboard shortcut and collects information about the compromised machine, such as security products running on the machine. FatalRAT also receives remote commands via a Command and Control server (C&C). This allows the attacker to perform additional actions, such as keylogging, execution of shell commands and downloading and execution of a remote file.

When was the Malware Reported?

Alien Labs published a report on August 2nd, 2021, however our investigation found that FatalRAT appears to have been around since at least May, 2021.

How is the Malware Distributed?

According to Alien Labs, "the malware, known as FatalRAT, appears to be distributed via forums and Telegram channels, hidden in download links that attempt to lure the user via software or media articles".

How Widespread is FatalRAT?

Based on the IOCs from the Alien Labs report and telemetry gathered by FortiGuard Labs, the FatalRAT infection is spread across at least 13 countries.

  • United Arab Emirates
  • China
  • Great Britain
  • Hong Kong
  • Indonesia
  • India
  • Japan
  • Cambodia
  • Myanmar
  • Philippines
  • Singapore
  • Thailand
  • United States of America

What can FatalRAT Do?

FatalRAT can perform the following actions:

  • Disables the Windows feature to lock the computer by using a keyboard shortcut
  • Collects information about the compromised machine such as security product running on the machine
  • Logs keystrokes
  • Executes shell commands
  • Deletes user info for popular Web browsers such as Edge, 360Secure Browser, QQBrowser, SogouBrowser, Firefox and Chrome
  • Downloads and executes of remote files
  • Changes resolution
  • Uninstalls a specific remote access software
  • Downloads and installs a specific remote desktop application
  • Propagates to another machines on the victim network by brute-forcing weak passwords through IPC$

What is the Status of Coverage?

FortiGuard Labs has the following AV coverage against FatalRAT:






For FortiEDR protections, all related samples for this threat will be blocked if executed on customer systems.


Traffic Light Protocol

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


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.


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.


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.


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.