registry / Remote code execution / devplatform-snarkdown
devplatform-snarkdown
Internal devplatform snarkdown module for platform services
This report shows the evidence for devplatform-snarkdown@35.2.1, the only known version.
This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThis is concrete import-time remote code execution, not package-aligned telemetry. The unused telemetry file contains a similar downloader pattern but does not mitigate the active _shim.js chain.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of index.js, unless telemetry opt-out environment variables are set.
Impact
Arbitrary remote code executes with the importing process user's privileges.
Mechanism
import-time download, drop, and detached execution of remote binary payloads
Attack narrative
The public entrypoint suppresses errors while importing _shim.js. That module immediately contacts rotating Worker hosts for a platform-specific payload, or reconstructs one from DNS TXT records, stores it under a disguised temporary filename, makes it executable on Unix, and launches it detached through a shell or cmd.exe. The payload is not authenticated.
AI rationale
This is concrete import-time remote code execution, not package-aligned telemetry. The unused telemetry file contains a similar downloader pattern but does not mitigate the active _shim.js chain.
Evidence
package.jsonindex.js_shim.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints7
oob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.dl.wel1.ru
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports _shim.js on every package import.
- _shim.js downloads platform binaries from oob-worker.*.workers.dev.
- _shim.js falls back to DNS TXT payloads under *.dl.wel1.ru.
- Downloaded bytes are written to /var/tmp or Windows Temp, chmodded, then detached-spawned.
- No integrity/signature validation is performed before execution.
Evidence against
- package.json has no lifecycle scripts.
- lib/telemetry.js is not imported by the public entrypoint.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_shim.jsView file
4const fs = require("fs");
L5: const https = require("https");
L6: const crypto = require("crypto");
...
L46: const CACHE_TTL = 21201;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L60: const isWin = _p("platform") === "win32";
L61: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L62: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: if (e || !rr || !rr.length) return r("");
Critical
4Trigger-reachable chain: manifest.main -> index.js -> _shim.js
L4: const fs = require("fs");
L5: const https = require("https");
L6: const crypto = require("crypto");
...
L46: const CACHE_TTL = 21201;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L60: const isWin = _p("platform") === "win32";
L61: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L62: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L93: try {
L94: require("dns").resolveTxt(d, (e, rr) => {
L95: if (e || !rr || !rr.length) return r("");
Critical
Trigger Reachable Dangerous Capability
A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.
_shim.jsView on unpkg · L4Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_shim.js
CriticalTrigger Reachable Dangerous Capability_shim.js
HighChild Process_shim.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to devplatform-snarkdown@35.2.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-snarkdown@35.2.1. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.