registry / Remote code execution / bigops-tslint
bigops-tslint
code style enforcer
This report shows the evidence for bigops-tslint@35.9.4. 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-aiThe behavior is concealed, unrelated to a code-style package, and remotely controlled at import time. Absence of npm lifecycle hooks does not mitigate this reachable execution chain.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any application code that requires/imports bigops-tslint.
Impact
Unconsented arbitrary code execution in the importing user's environment.
Mechanism
Import-time remote binary download and detached execution.
Attack narrative
The manifest exposes index.js, which silently requires _ext.js at import time. That module fetches a binary from obfuscated Workers hosts, with DNS TXT delivery as fallback, writes it into a temporary executable file, grants Unix execute permission, and starts it detached through /bin/sh or cmd.exe. This gives an attacker controlling the remote response arbitrary code execution whenever a consumer imports the package.
AI rationale
The behavior is concealed, unrelated to a code-style package, and remotely controlled at import time. Absence of npm lifecycle hooks does not mitigate this reachable execution chain.
Evidence
package.jsonindex.js_ext.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.dev/pkg/packageoob-worker.cf100-416.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf103-070.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 ./_ext on every package import.
- _ext.js downloads a platform payload over HTTPS or DNS TXT.
- _ext.js writes the payload to a temporary executable path and chmods it on Unix.
- _ext.js launches the downloaded file detached via shell/cmd.
- Remote hosts are obfuscated and payload retrieval errors are suppressed.
Evidence against
- package.json has no lifecycle scripts.
- No credential harvesting or AI-agent configuration writes were found.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_ext.jsView file
6const fs = require("fs");
L7: const https = require("https");
L8:
...
L42: const STAMP_TTL = 22704;
L43: const _l = (...a) => process.stderr.write("");
L44:
...
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
6Trigger-reachable chain: manifest.main -> index.js -> _ext.js
L6: const fs = require("fs");
L7: const https = require("https");
L8:
...
L42: const STAMP_TTL = 22704;
L43: const _l = (...a) => process.stderr.write("");
L44:
...
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.
_ext.jsView on unpkg · L6119try {
L120: const cp = require("child_process");
L121: if (isWin) {
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_ext.js
CriticalTrigger Reachable Dangerous Capability_ext.js
HighChild Process_ext.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to bigops-tslint@35.9.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing bigops-tslint@35.9.4. 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: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.