dolyame-ui-codemodsnpm
dolyame-ui-codemods is a confirmed malicious npm package (MAL-2026-13146) that executes malicious code on install (malicious version 35.2.6). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in dolyame-ui-codemods (npm)
What this malware does
On require('dolyame-ui-codemods'), index.js loads _polyfill.js, which reconstructs remote hostnames from split string-fragment arrays joined at runtime (assembling oob-worker.*.workers.dev subdomains and sdk/ext/pkg/net.dl.wel1.ru), selects a platform-specific endpoint, downloads a binary over HTTPS, writes it to /var/tmp or %TEMP% under a disguised name resembling dotnet_diag, chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe. A DNS-TXT-record fallback channel retrieves chunked base64 payloads from numbered subdomains of dl.wel1.ru when HTTPS delivery fails. A cooldown stamp file suppresses repeat execution and environment-variable checks gate execution to evade sandboxes. The package is advertised as a UI toolkit and has no legitimate need for a platform-native binary, obfuscated hostname assembly, or a DNS covert channel. Installing or importing this package causes remote code execution on the host.
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-codemods (version 35.2.6). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging dolyame-ui-codemods across your stack and pipelines.
If you installed it — respond
Remove dolyame-ui-codemods 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-codemods 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-codemods 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-codemods-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.