APT / THREAT GROUP
GrayBravo
2
aliases
Last seen:Mar 17, 2026
Intelligence Profile
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.
Threat Analysis
GrayBravo is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.
Intelligence Reports Mentioning GrayBravo
GrayBravo’s CastleLoader Activity Clusters Target Multiple Industries
Recorded Future Blog· Dec 8, 2025
External References
Quick Facts
TypeAPT / Threat Group
Aliases2
SourceMalpedia
Also Known As
GrayBravoTAG-150
Research Links
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.