dolyame-ui-react-version-switchnpm
dolyame-ui-react-version-switch is a confirmed malicious npm package (MAL-2026-13179) that executes malicious code on install (malicious version 35.6.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in dolyame-ui-react-version-switch (npm)
What this malware does
Package advertises itself as a React UI helper but its index.js unconditionally require()s./vendor at load time. vendor.js selects a platform-specific asset path, fetches bytes over HTTPS from a randomly-ordered pool of string-split-obfuscated hosts assembled via.join('') (oob-worker.cf*.workers.dev and sdk/ext/pkg/net.dl.wel1.ru), with a DNS-TXT chunked-base64 fallback to bypass HTTPS filtering. The downloaded bytes are written to /tmp or %TEMP% under disguised names such as dotnet_diag<hex>.exe or.cache<hex>, chmod 0755'd on POSIX, and spawned detached via /bin/sh or cmd.exe. No hash verification is performed despite a cover-story comment claiming a SHA-256 integrity check. The package's declared 'interface elements' purpose is a cover story: index.js is a trivial no-op class stub, and the dropper is the only functional behavior.
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 dolyame-ui-react-version-switch (version 35.6.1). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging dolyame-ui-react-version-switch across your stack and pipelines.
If you installed it — respond
Remove dolyame-ui-react-version-switch 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 dolyame-ui-react-version-switch 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 dolyame-ui-react-version-switch 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 dolyame-ui-react-version-switch-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.