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Threat Actors Unfading Sea Haze

Also known as: UNC5221, Transparent Tribe, CVE-2022-0543, HIUPAN, EggStreme Agent, Gorem RAT, mediocre mass of implants

Description

Unfading Sea Haze is a threat actor focused on espionage, targeting government and military organizations in the South China Sea region since 2018. They employ spear-phishing emails with malicious attachments to gain initial access, followed by the deployment of custom malware such as Gh0st RAT variants and SharpJSHandler. The group utilizes scheduled tasks and manipulates local administrator accounts for persistence, while also incorporating Remote Monitoring and Management tools into their attacks. Unfading Sea Haze demonstrates a sophisticated and patient approach, remaining undetected for years and showing adaptability through evolving exfiltration tactics and malware arsenal.

Goals & Targeting

Targeted Sectors

Government
Defense
Manufacturing

Targeted Countries / Regions

CN

AI Analysis

No AI analysis yet.

ATT&CK Techniques

No techniques linked yet.

Campaigns / Victims

No campaigns linked yet.

Observed Data

No observed data linked yet.

Indicators of Compromise

Filename 9 Domain 2 IPv4 Address 2 SHA-256 Hash 7

References

  1. businessinsights.bitdefender.com — Cited by web research for: Transparent Tribe
  2. unit42.paloaltonetworks.com — Cited by web research for: HIUPAN
  3. www.bitdefender.com — Cited by web research for: MSBuild
  4. www.bitdefender.com — Cited by web research for: SilentGh0st
  5. apt.etda.or.th — Cited by web research for: CVE-2023-46805

Intel Summary

0

Techniques

40

Tools

0

Campaigns

40

IOCs

0

Observed Data

0

Tactics

Tags

APT
Critical Infrastructure
Phishing
Backdoor / C2
Government Targeting

Details

Type
Unknown
Primary Motivation
Espionage
Country of Origin
C
Confidence
60%
Added
May 17, 2026
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