registry / Remote code execution / bigops-rx-post-message
bigops-rx-post-message
Bigops rx post message SDK for internal consumers
This report shows the evidence for bigops-rx-post-message@35.1.5, 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 hidden import-time loader establishes a concrete remote payload execution chain. Absence of npm lifecycle hooks does not mitigate execution on normal module use.
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
Impact
Arbitrary attacker-controlled code executes under the importing process user.
Mechanism
import-time remote binary download, drop, and execution
Attack narrative
The normal module entrypoint silently requires _init.js. Its run() function contacts rotated worker hosts for a platform-specific payload, or reconstructs one from attacker-controlled DNS TXT records. It saves sufficiently large data into a temporary executable file, marks Unix files executable, and launches it detached through /bin/sh or cmd.exe. This is remote code execution during ordinary package import, without a user-facing feature requiring it.
AI rationale
The hidden import-time loader establishes a concrete remote payload execution chain. Absence of npm lifecycle hooks does not mitigate execution on normal module use.
Evidence
package.jsonindex.js_init.js/tmp/.analytics_state/var/tmp/.cache_<random>%TEMP%/analytics_state%TEMP%/dotnet_diag_<random>.exe
Network endpoints8
oob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packagesdk.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 _init.js on every package require.
- _init.js downloads platform payloads from four workers.dev hosts.
- _init.js falls back to DNS TXT payload retrieval from *.wel1.ru.
- _init.js writes payloads to temp storage, chmods them, then detached-spawns them.
Evidence against
- package.json has no lifecycle scripts.
- The documented API in index.js is otherwise minimal.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_init.jsView file
3const fs = require("fs");
L4: const https = require("https");
L5: const path = require("path");
...
L44: const STAMP_TTL = 21372;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: if (e || !rr || !rr.length) return r("");
Critical
3Trigger-reachable chain: manifest.main -> index.js -> _init.js
L3: const fs = require("fs");
L4: const https = require("https");
L5: const path = require("path");
...
L44: const STAMP_TTL = 21372;
L45: const _l = (...a) => process.stderr.write("");
L46:
...
L55: const isWin = _p("platform") === "win32";
L56: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L57: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L91: try {
L92: require("dns").resolveTxt(d, (e, rr) => {
L93: 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.
_init.jsView on unpkg · L3119
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_init.js
CriticalTrigger Reachable Dangerous Capability_init.js
HighChild Process_init.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to bigops-rx-post-message@35.1.5.
The versions list below shows the verdict for each recorded version.
- Avoid installing bigops-rx-post-message@35.1.5. 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.