FireEye has uncovered a sophisticated intrusion campaign against government and corporate organizations, using a supply chain attack.

Supply chain attacks are one of the most sophisticated types of hacks in existence. While many hacks rely on convincing a target to download malicious software, a supply chain attack involves inserting malicious code in legitimate software before it’s distributed to customers, hence attacking the software supply chain.

The attack in question uses a compromised update to SolarWind’s Orion IT monitoring and management software, with FireEye calling the compromised version “SUNBURST.” The trojanized version is incredibly sophisticated, using various methods to avoid detection, all the while communicating with third-party servers.

“After an initial dormant period of up to two weeks, it retrieves and executes commands, called “Jobs”, that include the ability to transfer files, execute files, profile the system, reboot the machine, and disable system services,” writes FireEye’s team. “The malware masquerades its network traffic as the Orion Improvement Program (OIP) protocol and stores reconnaissance results within legitimate plugin configuration files allowing it to blend in with legitimate SolarWinds activity. The backdoor uses multiple obfuscated blocklists to identify forensic and anti-virus tools running as processes, services, and drivers.”

The trojan has enabled hackers to monitor email communications at the US Treasury and Commerce departments, according to Reuters. FireEye says victims have also “included government, consulting, technology, telecom and extractive entities in North America, Europe, Asia and the Middle East.” Since the attack is actively in progress, FireEye suspects there will be additional victims as well.

To mitigate the attack, “SolarWinds recommends all customers immediately upgrade to Orion Platform release 2020.2.1 HF 1, which is currently available via the SolarWinds Customer Portal. In addition, SolarWinds has released additional mitigation and hardening instructions here.”

If an organization is not able to update, FireEye has outlined additional mitigation steps that should be taken.