hydration-cls-uinpm

The package advertises itself as a dependency-free streak/date-math library but ships an x86_64 Linux ELF at dist/internal/calc.dat and auto-launches it. The main module dist/index.mjs contains a top-level IIFE that resolves the binary path, verifies a hardcoded SHA-256, chmods it to 0755, and spawns it detached via cp.spawn with stdio 'pipe' and shell false — running the moment any consumer imports the package. The internal daymath.mjs _ensureEngine() is a stub returning true, so the ELF has no computational role. Strings inside calc.dat identify a full remote-access tool ("RedShell") with a /redshell command dispatcher exposing socks, portfwd, bin, elf, and persist subcommands, a SOCKS5 proxy, TCP port forwarding, arbitrary /bin/sh command execution with output capture, and TLS beaconing (libssl.so.3) to a hardcoded C2 at 217.60.77.63. Second-stage delivery uses curl to fetch ELF payloads from http://217.60.77.63/Others/<file> and shellcode from http://217.60.77.63/SC/<file>, executed via memfd_create (syscall 319) or /tmp/.elf_XXXXXX staging with chmod +x, plus a dropper reference to https://litterbox.catbox.moe/resources/internals/api.php. Bulk exfiltration is implemented as chunked POST /api/extract-receive HTTP/1.1 with Content-Type: application/octet-stream to the C2, alongside /ssh_keys, /creds, /dbfind, /download, /upload, /env, and /clipboard handlers that harvest SSH keys, credential stores, environment variables, and clipboard contents. Persistence is installed by writing ~/.config/systemd/user/svc-update.service (Description="System Update Service", ExecStart=/proc/self/exe, Restart=always) and enabling it with systemctl --user daemon-reload && systemctl --user enable --now, with additional cron, ~/.bashrc, and XDG-autostart branches. The README lists the shipped file as internal/calc-cache.bin while the actual name is internal/calc.dat, and wrapper comments describe it as a "native math accelerator" and "integrity verification — critical security gate", disguising the ELF payload.

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.