ms-graph-types

{"modified":"2026-06-05T01:30:41Z","published":"2026-05-13T00:00:00Z","schema_version":"1.7.4","id":"MAL-2026-3651","summary":"Malicious code in ms-graph-types (npm)","details":"Two malicious npm packages published by the `micresoft` account (typosquatting \"microsoft\") are part of a coordinated supply chain attack sharing identical infrastructure with packages published by the `superbase` account. Each package bundles a 4.5 MB statically-linked, UPX-packed ELF binary at `.claude/settings` and a companion `.claude/settings.json` that registers the binary as a Claude Code `SessionStart` hook, causing it to execute every time Claude Code opens the compromised project directory. On initial install, the same binary is executed via a `preinstall` lifecycle hook. The binary connects to a C2 server at `207.90.194.2:443` and harvests environment variables, `$HOME` directory contents, and `/proc/` filesystem entries to exfiltrate developer credentials and system state.\n\n`ms-graph-types` impersonates `@microsoft/microsoft-graph-types`, the official TypeScript type definitions for Microsoft Graph objects (`microsoftgraph/msgraph-typescript-typings`). The package copies the legitimate repository contents including `microsoft-graph.d.ts`, CI configuration, and GitHub workflow files to appear authentic, while a `preinstall` hook executes the malicious `.claude/settings` binary on install.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: google-open-source-security (d83c3b506a10b770a8c1f98d280262478cccc65708bb1066a72e0708dccaaf75)\nThis malicious package is part the IronWorm campaign. This campaign executes a malicious binary payload during installation via a preinstall hook. The payload is a Rust-built infostealer that targets developer environments, scanning for and harvesting credentials related to cloud providers, object storage, databases, source-control, package registries, and AI developer tools. It also targets cryptocurrency wallets, specifically injecting a malicious JavaScript hook into the Exodus desktop wallet to capture passwords and recovery phrases. Furthermore, the malware exhibits worm-like behavior by stealing GitHub and NPM credentials to push malicious updates to the victim's repositories and publish trojanized packages, and it uses an eBPF-based kernel rootkit to hide its processes and network connections on Linux systems.\n","affected":[{"package":{"ecosystem":"npm","name":"ms-graph-types"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"versions":["2.43.2"]}],"references":[{"type":"ARTICLE","url":"http://www.ox.security/blog/ironworm-supply-chain-malware-hits-npm/"},{"type":"ARTICLE","url":"https://research.jfrog.com/post/iron-worm-shai-hulud-rustier-cousin/"}],"credits":[{"name":"SafeDep","type":"FINDER","contact":["https://safedep.io"]}],"database_specific":{"malicious-packages-origins":[{"source":"google-open-source-security","sha256":"d83c3b506a10b770a8c1f98d280262478cccc65708bb1066a72e0708dccaaf75","import_time":"2026-06-05T00:24:25.065752Z","modified_time":"2026-06-04T22:28:51.769005667Z","versions":["2.43.2"]}]}}