dolyame-boxy-atom-containernpm
Advisory published Updated
dolyame-boxy-atom-container is a confirmed malicious npm package (MAL-2026-13292) that opens a backdoor for remote access (malicious version 35.3.2). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in dolyame-boxy-atom-container (npm)
What this malware does
On require() of the package, index.js loads helpers.js which invokes setup() at module load. setup() selects a platform-specific payload path (linux/darwin/win32), rotates through obfuscated Cloudflare Workers hostnames (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), downloads bytes over HTTPS, writes them to /var/tmp/.cache<rnd> or %TEMP%/dotnet_diag_<rnd>.exe, sets mode 0755, and detaches execution via /bin/sh -c or cmd /c start. A DNS-TXT chunked fallback reassembles a base64 payload from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru when HTTPS fetch fails. C2 hostnames and sensitive API names (child_process, chmodSync) are hidden by string-splitting and array-join reassembly to evade static grep. A parallel dropper implementation lives in lib/telemetry.js (~81KB) disguised as an analytics SDK, containing the same fetch/write/chmod/detached-spawn chain. The package's declared purpose is reusable UI components; native-binary download and execution from anonymous Cloudflare Workers subdomains has no legitimate role in that scope, no publisher affiliation, and no hash or signature verification.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Search your lockfiles and build artifacts for dolyame-boxy-atom-container (version 35.3.2).
If you installed it — respond
dolyame-boxy-atom-container establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If dolyame-boxy-atom-container 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 dolyame-boxy-atom-container-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.