registry / Remote code execution / devplatform-api-v2-resource-mock
devplatform-api-v2-resource-mock
REST client wrapper
This report shows the evidence for devplatform-api-v2-resource-mock@35.4.1. 1 of 2 known versions is blocked or flagged. The newest version, 0.0.1-security, is allowed. See all versions.
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 a concrete import-time remote payload execution chain unrelated to the declared mock REST-client functionality. The absence of lifecycle hooks does not mitigate execution on normal package use.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Runtime import/require of devplatform-api-v2-resource-mock
Impact
Unconsented arbitrary native code execution under the importing process user.
Mechanism
remote binary download, DNS fallback, temporary-file drop, detached shell execution
Attack narrative
The package entrypoint silently requires _compat.js on every import. That module selects a platform payload path, fetches opaque bytes from rotating workers.dev hosts, or reconstructs them from DNS TXT records, writes the bytes to a temporary executable file, and launches it detached via cmd.exe or /bin/sh. The marker file and opt-out telemetry names obscure and throttle this execution.
AI rationale
This is a concrete import-time remote payload execution chain unrelated to the declared mock REST-client functionality. The absence of lifecycle hooks does not mitigate execution on normal package use.
Evidence
package.jsonindex.js_compat.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>%TEMP%\analytics_state%TEMP%\dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf99-9b3.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf101-adf.workers.devoob-worker.cf100-416.workers.dev
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports _compat.js at module load.
- _compat.js fetches platform binaries from four obfuscated workers.dev hosts.
- _compat.js falls back to DNS TXT payload retrieval from dl.wel1.ru subdomains.
- Downloaded data is written to /var/tmp or TEMP, made executable, then spawned detached.
- Marker files throttle repeated payload execution rather than providing package functionality.
- No integrity verification is performed despite a misleading comment.
Evidence against
- package.json has no lifecycle scripts.
- The advertised REST-client entrypoint is otherwise a minimal mock wrapper.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
4 flagged · loading source_compat.jsView file
2L3: const https = require("https");
L4: const crypto = require("crypto");
...
L44: const MAX_AGE = 21637;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L57: const isWin = _p("platform") === "win32";
L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_compat.jsView on unpkg · L22Trigger-reachable chain: manifest.main -> index.js -> _compat.js
L2:
L3: const https = require("https");
L4: const crypto = require("crypto");
...
L44: const MAX_AGE = 21637;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L57: const isWin = _p("platform") === "win32";
L58: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L59: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: 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.
_compat.jsView on unpkg · L2Findings
2 Critical2 High3 Medium2 Low
CriticalDownload Execute_compat.js
CriticalTrigger Reachable Dangerous Capability_compat.js
HighChild Process_compat.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to devplatform-api-v2-resource-mock@35.4.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing devplatform-api-v2-resource-mock@35.4.1. 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.