MAL-2026-4288 Malicious code in @jaggle/resizeobserves (npm)

Package name impersonates the popular @juggle/resize-observer (j→j substitution and pluralized 'resizeobserves') and the README is copied verbatim from the legitimate package, but the tarball ships an unrelated Python module (clipboard_guardian) that has nothing to do with a ResizeObserver polyfill. The postinstall hook (npm-install.cjs) bootstraps Python and pip on the installer's machine — attempting privileged installs via sudo -n / pkexec apt-get / pacman / dnf, falling back to fetching get-pip.py from bootstrap.pypa.io — then runs pip install --break-system-packages on the bundled clipper, and finally writes a persistent autostart entry under a disguised name: a systemd user unit python3-dbus-helper.service on Linux, a com.apple.python.runtime.plist LaunchAgent on macOS, or an HKCU\...\Run\PyRuntimeBroker value on Windows. Once running, clipboard_guardian/guardian.py monitors the user's clipboard, matches outgoing content against regexes for 40+ blockchains, and silently replaces any detected wallet address with one of the attacker's hardcoded wallets (e.g., ethereum 0x450c0E58Fc2ba03632d3F5780ad8C966648B6F18, bitcoin bc1qs2mpls4p0f7fng073gy2rcdgjpf7la4eugpt6y, plus monero/etc.) — any crypto payment the victim copies is redirected to the attacker. The daemon further disguises itself via setproctitle('python3-dbus-helper' / 'com.apple.python.runtime') and SetConsoleTitleW('Python Runtime Broker') to blend with OS components, ships an anti-clipper cover story in pyproject.toml while being the clipper itself, and contains an is_monitor_running() routine that pauses substitution when task managers / process explorers (taskmgr, procexp, procmon, ProcessHacker, Activity Monitor, htop, btop, gnome-system-monitor, etc.) are detected. The combination of typosquat naming, install-time privileged persistence, hardcoded attacker wallets, and explicit anti-analysis logic makes intent unambiguous.

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.

The OpenSSF Package Analysis project identified '@jaggle/resizeobserves' @ 1.0.11 (npm) as malicious.

It is considered malicious because:

• The package executes one or more commands associated with malicious behavior.