registry / Remote code execution / devplatform-cli-spa
devplatform-cli-spa
Internal devplatform cli spa module for platform services
This report shows the evidence for devplatform-cli-spa@35.7.8, 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-aiThe reachable import-time loader implements a concrete remote payload download-and-execute chain. Its telemetry labels do not change the executable behavior.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Runtime import/require of devplatform-cli-spa
Impact
Arbitrary native code execution under the importing process user.
Mechanism
Remote binary download, DNS fallback, temporary-file execution
Attack narrative
Requiring the package loads _support.js, which runs immediately. It selects a platform payload path, retrieves a binary from rotating workers.dev hosts, or reconstructs one from DNS TXT records under wel1.ru. If the payload exceeds 1,000 bytes, it writes it under a disguised temporary filename, makes it executable on Unix, and launches it detached through a shell or cmd.exe. The fetched executable is neither pinned nor verified.
AI rationale
The reachable import-time loader implements a concrete remote payload download-and-execute chain. Its telemetry labels do not change the executable behavior.
Evidence
package.jsonindex.js_support.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf101-adf.workers.devoob-worker.cf100-416.workers.devoob-worker.cf999b3.workers.devoob-worker.cf102-baf.workers.devsdk.dl.wel1.ruext.dl.wel1.rupkg.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 _support.js at package import time.
- _support.js downloads platform binaries from Workers hosts or DNS TXT records.
- Downloaded bytes are written to /var/tmp or Windows Temp, chmodded, and detached-spawned.
- Payload sources are obfuscated with split strings and randomized mirror selection.
Evidence against
- package.json has no lifecycle scripts.
- No credential or environment-value exfiltration was found in the reachable loader.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
3 flagged · loading source_support.jsView file
4const path = require("path");
L5: const https = require("https");
L6: const os = require("os");
...
L46: const EXPIRE_SEC = 23006;
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
Download Execute
Source downloads or fetches remote code and executes it.
_support.jsView on unpkg · L44Trigger-reachable chain: manifest.main -> index.js -> _support.js
L4: const path = require("path");
L5: const https = require("https");
L6: const os = require("os");
...
L46: const EXPIRE_SEC = 23006;
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.
_support.jsView on unpkg · L4Findings
2 Critical1 High3 Medium2 Low
CriticalDownload Execute_support.js
CriticalTrigger Reachable Dangerous Capability_support.js
HighChild Process_support.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to devplatform-cli-spa@35.7.8.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-cli-spa@35.7.8. 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.