MAL-2026-6278 Malicious code in ts-wross (npm)

Package is published under the name ts-wross but its package.json claims authorship by Michael Mclaughlin ([email protected]) and points its repository field at https://github.com/MikeMcl/big.js.git, with description and keywords copied from the legitimate big.js arbitrary-precision arithmetic library. The shipped source is a verbatim copy of big.js v7.0.1 with one modification: a try/catch block injected mid-file in both big.js and big.mjs that runs const doc = require("node-slot"); doc.from_str().then(...).catch(...) at module load. Errors are swallowed by the surrounding try/catch so the call is silent. node-slot is declared as a runtime dependency ("node-slot": "^1.0.8") and is therefore pulled in and executed on any require('ts-wross') / import 'ts-wross'. The legitimate big.js has zero dependencies and no such call — the inserted require is a loader trampoline that hands import-time execution on the installer's machine to whatever code node-slot ships. Combined with the impersonated metadata, the package is a lure that drops attacker-controlled code into any consumer that installs it under the assumption it is or relates to big.js.

Any 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.