devplatform-react-rest-clientnpm
devplatform-react-rest-client is a confirmed malicious npm package (MAL-2026-12740) that typosquats a legitimate package to trick installs (malicious version 35.4.8). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in devplatform-react-rest-client (npm)
What this malware does
On require of this package, index.js loads ext.js, which fetches a platform-specific binary from a rotating list of Cloudflare workers.dev hosts assembled at runtime via array.join to defeat static string scanning (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT chunked fallback channel via *.dl.wel1.ru (sdk, ext, pkg, net). The fetched binary is written to /tmp or %TEMP% under a cover-story name impersonating.NET diagnostics tooling (dotnet_diag<hex>.exe on Windows,.cache_<hex> on POSIX), chmod 0755 on POSIX, and spawned detached via /bin/sh -c or cmd.exe. Any consumer that requires the package on install/import receives arbitrary attacker-controlled code execution on the host.
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
TyposquatFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for devplatform-react-rest-client (version 35.4.8). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging devplatform-react-rest-client across your stack and pipelines.
If you installed it — respond
devplatform-react-rest-client is a typosquat — you almost certainly intended a legitimately-named package. Remove devplatform-react-rest-client, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If devplatform-react-rest-client 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 devplatform-react-rest-client 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 devplatform-react-rest-client-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.