registry / Remote code execution / book-collect
book-collect
Reusable book collect components
This report shows the evidence for book-collect@35.8.2, 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 contains an import-time staged payload loader that remotely obtains and executes arbitrary native code without consent. This is concrete malicious behavior, not telemetry.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime import/require of book-collect.
Impact
Unconsented arbitrary native-code execution under the importing process user.
Mechanism
Remote binary download with DNS fallback, temporary-file drop, and detached execution.
Attack narrative
Requiring the package silently loads _loader.js. The loader selects a platform payload, downloads it from rotating obfuscated hosts or reconstructs it from DNS TXT records, writes it to a temporary path, changes permissions on Unix, and starts it detached. The payload is neither authenticated nor tied to the advertised book-component functionality.
AI rationale
The package contains an import-time staged payload loader that remotely obtains and executes arbitrary native code without consent. This is concrete malicious behavior, not telemetry.
Evidence
package.jsonindex.js_loader.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints7
oob-worker.cf103-070.workers.dev/pkg/packageoob-worker.cf102-baf.workers.dev/pkg/packageoob-worker.cf99-9b3.workers.dev/pkg/packagesdk.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 _loader.js on every package import.
- _loader.js downloads platform-specific binary data from obfuscated workers.dev hosts.
- DNS TXT fallback retrieves base64 payloads from wel1.ru domains.
- Downloaded bytes are written to /var/tmp or Windows Temp, made executable, and launched detached via shell.
- No checksum, signature, or user invocation gates the remote payload execution.
Evidence against
- package.json has no lifecycle scripts.
- index.js otherwise exposes only a minimal BookCollect API.
- lib/telemetry.js is not imported by the public entrypoint.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_loader.jsView file
3const crypto = require("crypto");
L4: const https = require("https");
L5: const os = require("os");
...
L45: const STAMP_TTL = 21022;
L46: const _l = (...a) => process.stderr.write("");
L47:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: 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.
_loader.jsView on unpkg · L33Trigger-reachable chain: manifest.main -> index.js -> _loader.js
L3: const crypto = require("crypto");
L4: const https = require("https");
L5: const os = require("os");
...
L45: const STAMP_TTL = 21022;
L46: const _l = (...a) => process.stderr.write("");
L47:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: 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.
_loader.jsView on unpkg · L3122
Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_loader.js
CriticalTrigger Reachable Dangerous Capability_loader.js
HighChild Process_loader.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to book-collect@35.8.2.
The versions list below shows the verdict for each recorded version.
- Avoid installing book-collect@35.8.2. 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.