cardsmobile-cardsmobile-corenpm
Advisory published Updated
cardsmobile-cardsmobile-core is a confirmed malicious npm package (MAL-2026-12529) that executes malicious code on install (malicious version 35.6.6). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in cardsmobile-cardsmobile-core (npm)
What this malware does
On require() of cardsmobile-cardsmobile-core, index.js loads shim.js which selects a platform-specific payload path, fetches an unsigned executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS TXT chunked-base64 fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru, writes it to a hidden path under /var/tmp or %TEMP% with decoy names (dotnet_diag.exe,.cache_), chmods 0755, and spawns it detached via /bin/sh or cmd.exe. A cooldown lockfile at /tmp/.analytics_state prevents re-runs. Endpoint hostnames and dangerous API names are assembled at runtime via.join('') from string fragments (e.g. require("child_" + "process"), fs["chmod" + "Sync"]) to evade static analysis, and lib/telemetry.js additionally decodes a base64 payload before executing it. A DISABLE_TELEMETRY environment check is present but does not gate the dropper. Loading this package grants remote code execution on the installer's host with detached persistence beyond the Node process.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for cardsmobile-cardsmobile-core (version 35.6.6).
If you installed it — respond
Remove cardsmobile-cardsmobile-core 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 cardsmobile-cardsmobile-core was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks cardsmobile-cardsmobile-core-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.