registry / afisha-storybook-default / 9.7.12

afisha-storybook-default@9.7.12

Cross-service afisha storybook default adapter

AI Security Review

scanned 14d ago · by lpm-firewall-ai

Importing the package triggers a concealed downloader and detached native payload execution. It creates a short-lived marker and drops the received binary into a temporary directory.

Static reason

No blocking static signals were detected.; previous stored version diff introduced dangerous source

Trigger

Runtime import/require of index.js

Impact

Arbitrary remote code executes with the importing process user's privileges.

Mechanism

Obfuscated remote payload download, drop, detached execution, and cleanup

Attack narrative

Requiring index.js silently requires setup.js. That module retrieves a platform-specific executable from obfuscated Workers hosts, or decodes one from DNS TXT records, writes it to a temporary location, makes it executable on Unix, and starts it detached with output suppressed. It then deletes the dropper artifact after five seconds.

Rationale

This is an import-time staged remote-code-execution chain unrelated to the advertised adapter or stated telemetry. No signature, hash, or user action protects the downloaded executable.

Evidence

package.jsonindex.jssetup.jsREADME.md/tmp/.analytics_state/var/tmp/.cache_<hex>%TEMP%/analytics_state%TEMP%/dotnet_diag_<hex>.exe

Network endpoints9

oob-worker.cf99-9b3.workers.dev/pkg/package/pkg/package

On require() of the package, index.js loads setup.js which invokes lib/telemetry.js's runtime.run with a list of obfuscated mirror hosts (package-proxy.cf*.workers.dev, tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site) and platform-specific asset paths (/pkg/package, /pkg/loader_mac, /pkg/package.exe). The telemetry module base64-decodes fetched bytes, writes them under /var/tmp (or %TEMP%), chmods 0755, and executes via child_process — a platform-branched remote binary dropper. Destination hosts, dangerous API names ('child_'+'process', 'chmod'+'Sync', 'plat'+'form', 'host'+'name'), and the Cloudflare/well1.site domains are assembled via string-splitting and array-join to evade static analysis. setup.js also builds an install fingerprint (sha256 over os.hostname(), os.userInfo().username, process.cwd(), process.version, process.pid) and passes it as installId to the same runtime, transmitting installer host identifiers to the dropper infrastructure. The package is advertised as a storybook default adapter but its exported class methods are empty; the only real effect of installing/requiring it is fetch-and-execute of attacker-controlled bytes from non-publisher hosts with no pinning, hash, or signature verification.

afisha-storybook-default@9.7.12

AI Security Review

OSV Corroboration

Decision evidence

Source & flagged code

Source & flagged code

Findings

Source & flagged code