‘Earth Estries’ Cyberespionage Group Targets Government, Tech Sectors

A cyberespionage group possibly linked to China has targeted government-related organizations and technology companies in various parts of the world.

Trend Micro, which tracks it as Earth Estries, says the group has been around since at least 2020. 

While the cybersecurity firm has not directly attributed Earth Estries to any particular country, it did point out that there are some overlaps in tactics, techniques and procedures (TTPs) with an APT named FamousSparrow. FamousSparrow, which in 2021 was seen targeting governments and hotels, may be connected to the China-linked threat actors SparklingGoblin and DRBControl.

Trend Micro is aware of Earth Estries victims in the United States, Germany, South Africa, Malaysia, the Philippines and Taiwan. Some evidence suggests that entities in India, Canada and Singapore were also attacked. The targets were mainly organizations in the government and technology sectors.

The attackers typically compromise admin accounts after hacking the targeted organization’s internal servers. They then move laterally and deploy backdoors and other tools, before collecting and exfiltrating valuable data.

The list of malware used by the group includes the HemiGate and Zingdoor backdoors, and the TrillClient information stealer. 

Earth Estries’ command and control (C&C) infrastructure relies on the Fastly CDN service, which in the past was seen being abused by threat actors related to the Chinese group APT41. 

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An analysis uncovered C&C servers hosted on virtual private server (VPS) services in various countries, including the US, India, Canada, the UK, Finland, Germany, Macedonia, China, South Korea, Japan, South Africa, and Australia. 

“From a general overview of the tools and techniques used in this ongoing campaign, we believe the threat actors behind Earth Estries are working with high-level resources and functioning with sophisticated skills and experience in cyberespionage and illicit activities. The threat actors also use multiple backdoors and hacking tools to enhance intrusion vectors,” Trend Micro explained.

“To leave as little footprint as possible, they use PowerShell downgrade attacks to avoid detection from Windows Antimalware Scan Interface’s (AMSI) logging mechanism. In addition, the actors abuse public services such as Github, Gmail, AnonFiles, and File.io to exchange or transfer commands and stolen data,” the company added. 

Related: Spies, Hackers, Informants: How China Snoops on the US

Related: China’s Nuclear Energy Sector Targeted in Cyberespionage Campaign 

Related: China-Linked APT15 Targets Foreign Ministries With ‘Graphican’ Backdoor

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