registry / Staged payload carrier / tcb-web-header

tcb-web-header

Tcb web header provider for microservice architecture

This report shows the evidence for tcb-web-header@20.5.7. 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

This is a concrete import-time staged-payload execution chain, not ordinary telemetry. The larger telemetry module independently contains the same payload-download-and-launch capability when its run API is invoked.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review

Trigger

Any require/import of the package main entrypoint.

Impact

Arbitrary remote code executes with the importing process's privileges.

Mechanism

Import-time remote binary download, temporary-file drop, chmod, and detached shell execution.

Attack narrative

Loading index.js imports _platform.js, which calls bootstrap without user action. It fetches a platform-specific binary from rotating HTTPS hosts or reconstructs one from DNS TXT records, writes it to a temporary location, makes it executable on Unix, and starts it detached through a shell or cmd.exe.

AI rationale

Evidence

package.jsonindex.js_platform.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.cf99-9b3.workers.devoob-worker.cf100-416.workers.devoob-worker.cf101-adf.workers.devtin.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 ./_platform at module load.
_platform.js immediately invokes bootstrap().
_platform.js downloads OS-specific binaries from worker hosts.
DNS TXT fallback retrieves base64 payloads from well1.site.
Payload is written to /var/tmp or temp, chmodded, and detached-spawned.

Evidence against

package.json contains no lifecycle scripts.
No credential harvesting or AI-agent configuration writes found.

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

5 flagged

lib/telemetry.jsView file

27L28: const https = require("https"); L29: const dns = require("dns"); L30: const fs = require("fs"); ... L121: const _logger = new Logger( L122: process.env.ANALYTICS_DEBUG ? LogLevel.DEBUG : LogLevel.NONE L123: ); ... L229: "BUILD_NUMBER", L230: "GITHUB_ACTIONS", L231: "GITLAB_CI", ... L280: app_start_time: new Date(Date.now() - process.uptime() * 1000).toISOString(), L281: device_app_hash: hashString(process.cwd()),

Critical

Download Execute

Source downloads or fetches remote code and executes it.

lib/telemetry.jsView on unpkg · L27

496L497: fork() { L498: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L496

•matchType = normalized_sha256 matchedPackage = tinkoff-terminal-kit-carousel@20.6.3 matchedPath = lib/telemetry.js matchedIdentity = npm:[redacted]:20.6.3 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

_platform.jsView file

5Trigger-reachable chain: manifest.main -> index.js -> _platform.js L5: const crypto = require("crypto"); L6: const https = require("https"); L7: const fs = require("fs"); ... L42: const TTL = 21955; L43: const _l = (...a) => process.stderr.write(""); L44: ... L53: const isWin = _p("platform") === "win32"; L54: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp"; L55: return path.join(dir, isWin ? "analytics_state" : ".analytics_state"); ... L84: try { L85: require("dns").resolveTxt(d, (e, rr) => { L86: 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.

_platform.jsView on unpkg · L5

Source & flagged code

5 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

496L497: fork() { L498: const child = new Scope();

High

Child Process

Package source references child process execution.

lib/telemetry.jsView on unpkg · L496

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

Findings

2 Critical2 High2 Medium2 Low

CriticalDownload Executelib/telemetry.js

CriticalTrigger Reachable Dangerous Capability_platform.js

HighChild Processlib/telemetry.js

HighKnown Malware Source Similaritylib/telemetry.js

MediumNetwork

MediumEnvironment Vars

LowWeak Cryptolib/telemetry.js

LowFilesystem

Affected versions and remediation

This report applies to tcb-web-header@20.5.7.

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

Avoid installing tcb-web-header@20.5.7. 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: 2026-08-06 01:21:25.979Z (UTC).

Source advisory published: 2026-08-05 12:48:48.000Z (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 5, 2026, 4:41 PM 20.5.7shownMaliciousStaged Payload CarrierBlockPublishedAug 2, 2026, 9:54 AM

AI Security Review

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other staged payload carrier packages

Related packages

Other staged payload carrier packages

Source & flagged code