GrayBravo
Aliases: TAG-150
- First seen
- 2020-01-01 00:00:00
- Primary motivation
- espionage
- Sophistication
- advanced
- Resource level
- government
- Actor type
- nation-state
- Last IoC activity
- 2026-07-18 01:00:06
- Profile updated
- 2026-07-07 12:25:32
Targeted industries: government-and-public-sector technology-and-telecommunications financial-services defense-and-aerospace energy-and-utilities
Context
TAG-150, also known as GrayBravo, is a sophisticated threat actor responsible for developing multiple custom malware families, including CastleLoader and CastleRAT, and operates a large-scale, multi-layered infrastructure. The group employs the ClickFix technique to distribute malware through phishing attacks that impersonate legitimate services, leveraging deceptive domains and fake repositories. Insikt Group has identified four distinct activity clusters associated with TAG-150, each targeting different victim profiles and utilizing unique TTPs.
Reports & references
- recordedfuture.com — Graybravos Castleloader Activity Clusters Target Multiple Industries (report)
- recordedfuture.com — From Castleloader To Castlerat Tag 150 Advances Operations (report)