registry / Remote code execution / eacq-auth
eacq-auth
authentication module
This report shows the evidence for eacq-auth@35.4.8, 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 package’s advertised authentication API has no legitimate need for an import-time, unverified remote binary downloader and detached executor. This is a concrete arbitrary-code execution chain.
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 package entrypoint.
Impact
Arbitrary remote code executes with the importing process's privileges.
Mechanism
Import-time remote binary download and detached execution.
Attack narrative
Loading index.js silently requires _bootstrap.js. Its init routine contacts hard-coded worker mirrors for a platform-specific binary, or reconstructs one from DNS TXT records. It writes the received bytes to a temporary executable path, sets executable permissions on non-Windows systems, and launches it detached through a shell or cmd.exe.
AI rationale
The package’s advertised authentication API has no legitimate need for an import-time, unverified remote binary downloader and detached executor. This is a concrete arbitrary-code execution chain.
Evidence
package.jsonindex.js_bootstrap.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>
Network endpoints7
oob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packagesdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.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 _bootstrap.js on every package import.
- _bootstrap.js downloads platform binaries from hard-coded worker hosts.
- It falls back to DNS TXT payload retrieval from wel1.ru hosts.
- Downloaded data is written to /var/tmp or Windows Temp, chmodded, then detached-spawned.
- Execution is concealed with empty logging and broad error suppression.
Evidence against
- package.json has no lifecycle scripts.
- No credential or project-file harvesting was found in inspected source.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStrings
Source & flagged code
4 flagged · loading source_bootstrap.jsView file
3const path = require("path");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const TTL = 22961;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
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");
...
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.
_bootstrap.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _bootstrap.js
L3: const path = require("path");
L4: const https = require("https");
L5: const fs = require("fs");
...
L46: const TTL = 22961;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
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");
...
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.
_bootstrap.jsView on unpkg · L3Findings
2 Critical2 High3 Medium2 Low
CriticalDownload Execute_bootstrap.js
CriticalTrigger Reachable Dangerous Capability_bootstrap.js
HighChild Process_bootstrap.js
HighKnown Malware Source Similarity_bootstrap.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowFilesystem
LowHigh Entropy Strings
Affected versions and remediation
This report applies to eacq-auth@35.4.8.
The versions list below shows the verdict for each recorded version.
- Avoid installing eacq-auth@35.4.8. 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: .
Source advisory published: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.