Malware

STG Stealer

2 mentions in 7 days · 2 in 30 days · 2 total · first seen Sep 9, 2026 · last 6d ago

Timeline2 articles

Hackers Target Claude, Cursor and Codex AI Agents to Steal Tokens and Prompt Histories

Gen Digital found infostealers like Amatera and Remus stealing AI coding agent tokens, prompt histories, and MCP configs from infected Windows and macOS machines.

Gen Digital analysts observed Amatera and Remus detections among tens of thousands of protected Windows users over three months, with Amatera targeting Cline and Continue data and Remus targeting Claude, Cursor, and OpenCode. CallbackBeaver added Cursor and Claude to its collection scope with more than 5,000 samples in 30 days, while macOS-focused Djinn Stealer has been associated with Claude, Codex, Gemini, Cline, OpenCode, and Kilo. The stealers harvest access and refresh tokens, prompt histories, and MCP configuration files that can expose source control, ticketing, databases, cloud resources, and sensitive project context for follow-on fraud. Many stealers add targets via remotely managed rules, meaning this is an adaptation of existing infostealers rather than a new vulnerability in the AI tools themselves.

Cyber Security Newsupdated Sep 10, 10:36 UTC · 5d agofirst Sep 9, 11:41 UTC · 6d agoMalware in the wild 4 sources2

Infostealers Target Claude, Cursor, Codex and Other AI Agents to Steal Credentials and Sensitive Data

Gen Digital researchers report infostealer families Amatera, Remus and CallbackBeaver now harvest Claude, Cursor and Codex agent data, including tokens and MCP configs.

Gen Digital researchers found commodity infostealers extending their collection rules to local AI coding agent data from Claude, Cursor, Codex, Cline, Continue and OpenCode on Windows and macOS. Amatera targets Cline and Continue, Remus targets Claude, Cursor and OpenCode, and CallbackBeaver added Claude and Cursor with more than 5,000 samples observed in 30 days; Djinn Stealer hits Claude, Codex, Gemini, Cline, OpenCode and Kilo on macOS. Stolen data includes access and refresh tokens, prompt histories, conversation databases and MCP configurations holding API keys, potentially exposing connected source-control, cloud and ticketing systems. Remus is assessed as a Lumma Stealer variant using EtherHiding C2 resolution via Ethereum smart contracts.

GBHackersupdated Sep 10, 10:36 UTC · 5d agofirst Sep 9, 07:05 UTC · 6d agoMalware in the wild 4 sources1

Appears with

malware Amatera 2 malware APEX Stealer 2 malware BeeStealer 2 malware CallbackBeaver 2 malware Djinn Stealer 2 malware HydraStealer 2 malware Otter Stealer 2 malware Remus 2 product Claude 2 product Cline 2 product Codex 2 product Continue 2 product Cursor 2 product OpenCode 2 vendor Gen Digital 2 product Gemini 1

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