bigops-nitro-events-table@35.4.2

Analysis

bigops-nitro-events-table@35.4.2 is a trojanized pub/sub adapter. On module load it runs a bundled shim (_shim.js) that fingerprints the platform/architecture and downloads a second-stage binary over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev and oob-worker[.]cf103-070[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac and /pkg/package.exe. If the HTTPS download fails it falls back to a DNS-TXT exfiltration channel: it queries c[.]sdk[.]dl[.]wel1[.]ru (and ext[.]dl[.]wel1[.]ru / pkg[.]dl[.]wel1[.]ru / net[.]dl[.]wel1[.]ru per platform) for base64-encoded chunks that are reassembled into the binary. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process via cmd.exe /c start /b or /bin/sh -c "<path> &". A lock file at /tmp/.analytics_state throttles re-execution. The package also probes for sandbox environments before activating the payload.