bigops-legacy-utils @35.2.6
Vulnerability report · Last retrieved from osv.dev August 19, 2026 at 11:52 AM UTC
OSV ID
MAL-2026-13222
Ecosystem
npm
Summary
On require('bigops-legacy-utils'), index.js loads _polyfill.js which selects a platform-specific payload path, downloads opaque binary bytes from hardcoded Cloudflare workers.dev subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT base64 fallback under *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), writes the payload to /var/tmp or %TEMP% under disguised names (.cache_<suffix> on POSIX, dotnet_diag_<suffix>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames are reassembled from split string fragments (e.g. ['sdk.dl.w','el1.ru'].join('')) to evade static matching, execution is suppressed only when DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK is set, and a stamp file at /tmp/.analytics_state throttles re-runs. Comments label the code as 'polyfill'/'analytics' as cover.
Source: amazon-inspector (7bb10772ad63d0dbea89e74d3ad56deb097746551202cae3fb1a253b42ca11e0)
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