Threat Signal Report

GIMMICK Implant Used by StormCloud APT Targeting Users in Asia

description-logo Description

FortiGuard Labs is aware of a new variant of the GIMMICK malware that is targeting Asian users. Discovered by researchers at Volexity, the GIMMICK implant has been attributed to the StormCloud APT group. According to the report, GIMMICK variants for macOS and Windows environments were seen. It also has been observed to be using File based command and control, specifically Google Cloud.

GIMMICK has been attributed to nation state actors operating out of China.


What is GIMMICK?

GIMMICK is an implant that is similar to a remote access trojan (RAT) that allows the attacker to perform various instructions on the victim machine to further lateral movement. What makes this different from a RAT is that it is asynchronous in nature, moves in predefined pattern and does not really rely on an attacker to control. Once the implant is run, it follows a set of steps to further lateral movement and stores all information in a set of directories. Once these steps are completed, the exfiltrated data will be automatically uploaded to a predefined C2 server hosted on Google Drive. This allows for the implant to go undetected as traffic to Google Drive would be considered clean and not malicious traffic.


What Operating Systems are Affected?

MacOS and Windows platforms.


Is GIMMICK Attributed to any other Groups?

No. GIMMICK appears to be attributed to StormCloud only.


What is the Status of Coverage?

FortiGuard Labs has AV coverage in place as:

Customers running the latest definitions are protected by the following (AV) signature:

OSX/Gimmick.A!tr


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.