MAL-2026-12166 Malicious code in bigops-figma-to-html (npm)

On require, index.js unconditionally loads bootstrap.js, which selects a platform-specific endpoint, fetches an opaque binary from author-controlled Cloudflare Workers subdomains (oob-worker.cf*.workers.dev) with a DNS-TXT chunked fallback over *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru), writes it to /var/tmp/.cache<hex> on POSIX or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods 0755, and spawns it detached and unref'd via /bin/sh -c or cmd. Destination hostnames are constructed at runtime by joining split-string fragments (e.g. ["oob-wo","rker.cf103-070.worke","rs.de","v"].join("")) to hide them from static scanners. The DNS-TXT fallback retrieves a chunk count from c.<domain> and reassembles base64 chunks from N.<domain>, providing a covert delivery channel that bypasses HTTPS egress filtering. No hash or signature verification is performed; filenames impersonate dotnet diagnostics artifacts; opt-out is only via undocumented environment variables.