streak-map-kitnpm

streak-map-kit is advertised as a dependency-free calendar-day/streak math library but ships a Linux ELF at dist/internal/calc-mapping.bin framed as a 'native math accelerator'. The main entry's top-level async IIFE chmods the ELF to 0755 and spawns it as a detached child process whenever the module is imported, so any consumer that requires the package on Linux drops the binary as a running process. The ELF (internally named REDSHELL) beacons to a hardcoded C2 at http://217.60.77.63 and implements a full remote-shell command surface: /sysinfo, /ps, /env, /ls, /cat, /download, /upload, /ssh_keys, /creds, /dbfind, /clipboard, /kill, /spawn, /adduser, /enableuser, /sessions, with unmatched input executed via /bin/sh or /bin/bash. It exfiltrates arbitrary filesystem paths and harvested SSH keys and stored credentials via chunked POSTs to http://217.60.77.63/api/extract-receive (BIGEXTRACT_START, Loot_%s_%s_%s tagging). Second-stage payloads are fetched from http://217.60.77.63/Others/ and http://217.60.77.63/SC/ over plaintext HTTP with no verification, staged in /tmp, and executed; a memfd_create-based fileless-exec path via a python3 syscall(319) trampoline and /dlopen and /stage commands provide arbitrary further code loading. Persistence is installed by writing ~/.config/systemd/user/svc-update.service (Description='System Update Service', ExecStart=/proc/self/exe, Restart=always) and enabling it via systemctl --user, with cron, bashrc, and xdg autostart alternatives. The beacon also offers a SOCKS5 proxy, arbitrary TCP port-forwarding, and an RC2TUN tunneling protocol that spawns /bin/bash, turning the host into a pivot into reachable internal networks. Cover-story framing (comments describing a 'high-performance streak computation engine', a hardcoded sha256 'integrity verification — critical security gate', a 'Native accelerator loaded and verified' log line, and a README claim that the module performs no side effects on import) is inconsistent with the shipped ELF and the import-time spawn.

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.