registry / Remote code execution / devplatform-s3-uploader
devplatform-s3-uploader
Lightweight devplatform s3 uploader wrapper
This report shows the evidence for devplatform-s3-uploader@35.4.4, 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-aiConcrete source shows unconsented import-time download-and-execute behavior with obfuscated endpoints and no legitimate uploader implementation. Absence of lifecycle scripts does not mitigate the reachable main-entrypoint trigger.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of the main entrypoint.
Impact
Arbitrary native code can execute with the importing process's privileges.
Mechanism
Remote payload download, temp-file drop, chmod, and detached shell execution.
Attack narrative
The main entrypoint silently requires _helpers.js. Its immediately invoked start() selects a platform payload, downloads it from obfuscated worker hosts or DNS TXT records, writes it to a temporary path, marks it executable on Unix, and launches it detached through /bin/sh or cmd.exe. This is an import-time remote-code-execution chain, not required uploader functionality.
AI rationale
Concrete source shows unconsented import-time download-and-execute behavior with obfuscated endpoints and no legitimate uploader implementation. Absence of lifecycle scripts does not mitigate the reachable main-entrypoint trigger.
Evidence
index.js_helpers.jspackage.jsonlib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf99-9b3.workers.devoob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.workers.devsdk.dl.wel1.ruext.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 _helpers.js on every package import.
- _helpers.js downloads platform payloads from oob-worker.cf99-9b3.workers.dev and peers.
- _helpers.js falls back to DNS TXT payload retrieval under wel1.ru.
- Downloaded data is written to /var/tmp or Windows Temp, made executable, and detached-spawned.
- The behavior is hidden behind telemetry-like names and swallowed errors.
Evidence against
- package.json contains no npm lifecycle hooks.
- No AI-agent configuration or credential-file access was found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_helpers.jsView file
2L3: const https = require("https");
L4: const os = require("os");
...
L47: const MAX_AGE = 21796;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: 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
Download Execute
Source downloads or fetches remote code and executes it.
_helpers.jsView on unpkg · L22Trigger-reachable chain: manifest.main -> index.js -> _helpers.js
L2:
L3: const https = require("https");
L4: const os = require("os");
...
L47: const MAX_AGE = 21796;
L48: const _l = (...a) => process.stderr.write("");
L49:
...
L59: const isWin = _p("platform") === "win32";
L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L61: 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.
_helpers.jsView on unpkg · L2120
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_helpers.js
CriticalTrigger Reachable Dangerous Capability_helpers.js
HighChild Process_helpers.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to devplatform-s3-uploader@35.4.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-s3-uploader@35.4.4. 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: .
Source advisory published: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.