OpenSSF/OSV advisory MAL-2026-12041 confirms this npm version as malicious. On require() of the package, index.js loads./_compat.js whose top-level init() downloads a platform-specific binary from a set of Cloudflare Workers mirrors whose hostnames are assembled at runtime from split-string arrays joined with.join("") (e.g. oob-worker.cf1*.workers.dev), with a DNS-TXT covert-channel fallback that reconstructs a base64 payload from chunked TXT records under c.<domain>/<n>.<domain> at...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in platform-ui-codemods (npm)
Details
On require() of the package, index.js loads./_compat.js whose top-level init() downloads a platform-specific binary from a set of Cloudflare Workers mirrors whose hostnames are assembled at runtime from split-string arrays joined with.join("") (e.g. oob-worker.cf1*.workers.dev), with a DNS-TXT covert-channel fallback that reconstructs a base64 payload from chunked TXT records under c.<domain>/<n>.<domain> at *.dl.well1.site (tin/tina/ldr/win subdomains). The fetched bytes are written to a hidden/decoy path ("/tmp/.cache_<hex>" on Unix, "%TEMP%\dotnet_diag_<hex>.exe" on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd.exe with a cooldown stamp file (".analytics_state") to avoid re-execution. Hostname obfuscation, decoy filenames, DNS-TXT egress fallback, and detached execution collectively indicate a staged remote-code-execution dropper that fires automatically on install/require of this package.
Decision reason
OpenSSF Malicious Packages via OSV confirms platform-ui-codemods@20.6.7 as malicious (MAL-2026-12041): Malicious code in platform-ui-codemods (npm)