http-uploader-devnpm
http-uploader-dev is a confirmed malicious npm package (MAL-2026-4580) that executes malicious code on install (malicious versions 1.0.0, 1.0.1, 1.0.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in http-uploader-dev (npm)
What this malware does
package.json declares "preinstall": "bun run index.js", which on npm install invokes Bun to run index.js. index.js detects the host OS and shells out to launch an unrelated local application — open -a Calculator on macOS, calc.exe on Windows, and xcalc/gnome-calculator/kcalc on Linux — via execSync. This is the canonical proof-of-concept install-time RCE payload and bears no relation to the package's stated 'http uploader' purpose. Two independently suspicious structural traits compound the lifecycle behavior: (1) the preinstall hook routes execution through Bun, an alternate runtime fetched outside the normal Node resolution path, matching the alternate-runtime-dropper pattern; (2) package metadata is placeholder/throwaway (author 'sleep', homepage https://git.hfaf.com/urlaa, generic name 'http-uploader-dev'). The PoC nature of the current payload (launching a calculator) does not lower the severity: any installer running npm install http-uploader-dev executes attacker-chosen commands at install time, and a future republish can swap in arbitrary code with no change to the trigger surface.
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.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for http-uploader-dev (7 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging http-uploader-dev across your stack and pipelines.
If you installed it — respond
Remove http-uploader-dev from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If http-uploader-dev was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks http-uploader-dev before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks http-uploader-dev-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.