registry / Remote code execution / tcb-web-copy-to-clipboard

tcb-web-copy-to-clipboard

Tcb web copy to clipboard SDK for internal consumers

This report shows the evidence for tcb-web-copy-to-clipboard@20.1.2. 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-ai

The advertised clipboard SDK has no legitimate need to silently retrieve and execute unverified native payloads at import time. This is concrete remote code execution, independent of the absence of install hooks.

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

Remote code execution in the importing user's context.

Mechanism

Obfuscated remote binary download, DNS fallback, temp-file execution.

Attack narrative

Requiring index.js silently requires setup.js. That module retrieves a binary from obfuscated HTTPS hosts or reconstructed DNS TXT records, writes it under /var/tmp or Windows Temp, marks it executable on Unix, then starts it detached through a shell or cmd.exe.

AI rationale

Evidence

package.jsonindex.jssetup.jslib/telemetry.js

Network endpoints8

oob-worker.cf101-adf.workers.devoob-worker.cf99-9b3.workers.devoob-worker.cf103-070.workers.devoob-worker.cf100-416.workers.devtin.dl.well1.sitetina.dl.well1.siteldr.dl.well1.sitewin.dl.well1.site

Decision evidence

public snapshot

AI called this Malicious at 99.0% confidence as Malware with low false-positive risk.

Evidence for block

index.js imports ./setup on every package import.
setup.js downloads platform binaries over HTTPS, with DNS TXT fallback.
setup.js writes a hidden/temp binary, chmods it, and launches it detached.
Remote hosts are obfuscated Cloudflare Workers domains; DNS payload domains are also embedded.
lib/telemetry.js contains the same configurable download-to-execute primitive.

Evidence against

package.json has no npm lifecycle scripts.
No credential harvesting or exfiltration was found in the invoked entrypoint.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 3 file(s), 84.8 KB of source

Source & flagged code

6 flagged

lib/telemetry.jsView file

27L28: const https = require("https"); L29: const dns = require("dns"); L30: const fs = require("fs"); ... L116: const _logger = new Logger( L117: process.env.ANALYTICS_DEBUG ? LogLevel.DEBUG : LogLevel.NONE L118: ); ... L225: "BUILD_NUMBER", L226: "GITHUB_ACTIONS", L227: "GITLAB_CI", ... L276: app_start_time: new Date(Date.now() - process.uptime() * 1000).toISOString(), L277: device_app_hash: hashString(process.cwd()),

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/telemetry.jsView on unpkg · L27

491L492: fork() { L493: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L491

•matchType = normalized_sha256 matchedPackage = tinkoff-statist-web-typed-client-test.golden.retriever@20.4.4 matchedPath = lib/telemetry.js matchedIdentity = npm:[redacted]:20.4.4 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.jsView on unpkg

Low

Weak Crypto

Package source references weak cryptographic algorithms.

lib/telemetry.jsView on unpkg · L27

setup.jsView file

6Trigger-reachable chain: manifest.main -> index.js -> setup.js L6: const fs = require("fs"); L7: const https = require("https"); L8: ... L45: const MAX_AGE = 19983; L46: const _l = (...a) => process.stderr.write(""); L47: ... L59: const isWin = _p("platform") === "win32"; L60: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L61: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L94: try { L95: require("dns").resolveTxt(d, (e, rr) => { L96: 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.

setup.jsView on unpkg · L6

•matchType = token_shingles matchedPackage = tui-react-mobile-styles@20.8.7 matchedPath = _shim.js matchedIdentity = npm:dHVpLXJlYWN0LW1vYmlsZS1zdHlsZXM:20.8.7 similarity = 1.000 shingleOverlap = 48 summary = source token shingles overlapped finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

setup.jsView on unpkg

Source & flagged code

6 flagged · loading source

lib/telemetry.jsView file

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/telemetry.jsView on unpkg · L27

491L492: fork() { L493: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L491

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

lib/telemetry.js

Findings

2 Critical3 High2 Medium2 Low

CriticalDownload Executelib/telemetry.js

CriticalTrigger Reachable Dangerous Capabilitysetup.js

HighChild Processlib/telemetry.js

HighKnown Malware Source Similaritylib/telemetry.js

HighKnown Malware Source Similaritysetup.js

MediumNetwork

MediumEnvironment Vars

LowWeak Cryptolib/telemetry.js

LowFilesystem

Affected versions and remediation

This report applies to tcb-web-copy-to-clipboard@20.1.2.

The versions list below shows the verdict for each recorded version.

Avoid installing tcb-web-copy-to-clipboard@20.1.2. 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: 2026-08-26 01:14:23.662Z (UTC).

Source advisory published: 2026-08-05 12:29:35.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

2 known versions

0.0.1-securitylatestClean—AllowPublishedAug 25, 2026, 3:00 PM 20.1.2shownMaliciousRemote Code ExecutionBlockPublishedAug 2, 2026, 12:31 PM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other remote code execution packages

Related packages

Other remote code execution packages

Source & flagged code