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CastleLoader Activity Clusters Target Multiple Industries

· Published 09/12/2025 05:39 · Modified 21/12/2025 18:49

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Essential information

Published
09/12/2025 05:39
Modified
21/12/2025 18:49
Tags
2025-12-09 booking.com castlebot castleloader castlerat clickfix logistics malware-as-a-service matanbuchus netsupport rat phishing sectoprat warmcookie
Related entities
87 observables, 1 intrusion sets (apt), 7 malware, 200 others

Description

Insikt Group has identified four distinct activity clusters associated with GrayBravo's malware, each with unique tactics and victim profiles. This supports the assessment that GrayBravo operates a model. One cluster, TAG-160, impersonates firms and uses lures with the technique to distribute . Another cluster, TAG-161, impersonates and employs similar techniques. The analysis also uncovered potential links to the online persona "Sparja" and the broader cybercriminal ecosystem. GrayBravo demonstrates rapid evolution, technical sophistication, and adaptability in response to public exposure. The report recommends various security measures to defend against these threats.

External references