{"answers":{"affected":"1 open source package ship an affected version, including web3-token-helper.","exploited":"There is no known exploitation of MAL-2026-6274 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-6274 is a malicious package in web3-token-helper, published on 22 Jun 2026."},"fix_prompt":"MAL-2026-6274 is a malicious package: web3-token-helper (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-6274/ (Markdown: https://insights.sbomify.com/MAL-2026-6274/index.md)","id":"MAL-2026-6274","markdown":"https://insights.sbomify.com/MAL-2026-6274/index.md","name":"MAL-2026-6274","record":{"aliases":["GHSA-3w2v-mxgh-g2fw"],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"The package advertises itself as a Web3 fee utility but its main export is a dropper. index.js line 140 base64-decodes a platform-specific command string and executes it via child_process.exec inside the exported calculateFee() function — the exact call the README documents as the headline usage example (`calculateFee(100, 2)`). The decoded commands branch on host OS and fetch attacker binaries from https://www.mythicalsgames.com/files/sean/ (a typosquat of the legitimate mythicalgames.com; the path segment `sean` matches package.json's `author: \"sean\"`): on Windows, PowerShell with `-W Hidden` downloads SvcHostUpdate.exe into the user's Startup folder and runs it (login persistence); on Linux, syslog-service.py is written to ~/.local/share/.syslog, launched with nohup, and registered via `@reboot sleep 30 \u0026\u0026 /usr/bin/python3...` in the user's crontab (reboot persistence); on macOS, com.microsoft.VSCodeUpdate-darwin-\u003carch\u003e is written to /tmp, chmod +x'd, has its quarantine attribute stripped, and is exec'd. Filenames impersonate trusted OS components (SvcHostUpdate, syslog-service, com.microsoft.VSCodeUpdate) to evade casual process inspection. package.json also declares `\"postinstall\": \"node install.js\"`, but install.js is absent from the tarball — the postinstall is non-functional; the malicious payload triggers on first call to the documented API rather than at install time.\n\nAny computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in web3-token-helper (npm)","id":"MAL-2026-6274","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":["0"],"last_affected":[],"package":"web3-token-helper","purl":"pkg:npm/web3-token-helper","source":"MAL-2026-6274"}],"products":null,"published":"2026-06-22","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-6274/"}