dolyame-ui-tabs@35.3.2: Malicious npm security report (Block)

AI Security Review

scanned 10d ago · by lpm-firewall-ai

Importing the declared main entrypoint silently runs a remote binary downloader. It caches a stamp, drops a platform payload, and executes it detached.

Static reason

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

Trigger

Requiring/importing dolyame-ui-tabs

Impact

Arbitrary remote code executes as the importing user's account.

Mechanism

remote payload download, write, chmod, and detached execution

Attack narrative

The main entrypoint suppresses errors while importing _support.js. That module immediately runs, downloads a platform-specific binary from rotating Worker hosts or reconstructs one from DNS TXT records, writes it to a temporary location, marks Unix payloads executable, and launches it detached through a shell or cmd.exe. This is concealed remote code execution unrelated to the stated React-components package purpose.

Rationale

Concrete import-time download-and-execute behavior is present in the published entrypoint. The lack of an install hook does not mitigate runtime compromise on normal package use.

Evidence

package.jsonindex.js_support.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe

Network endpoints8

oob-worker.cf102-baf.workers.dev/pkg/package

OSV Corroboration

OpenSSF/OSV

Advisory

MAL-2026-13190

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in dolyame-ui-tabs (npm)

Details

index.js requires./_support, whose top-level run() fetches a platform-specific binary from obfuscated Cloudflare Workers subdomains (reconstructed via array.join() such as ['oob-worker.cf102-baf.','worker','s.','dev']) with a DNS-TXT chunked base64 fallback channel served from *.dl.wel1.ru resolver hosts (e.g. ['sd','k.dl.wel','1.','ru'].join('')). The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache_<hex>, dotnet_diag_<hex>.exe), chmod 0755'd on POSIX, and spawned detached via cp.spawn('/bin/sh', ['-c', fp+' &'], {detached:true}).unref(). Execution fires on require() of the package, giving arbitrary remote code execution on the installer's host at library-load time. The package is advertised as a React components/tabs library and has no legitimate need for a native binary or DNS-TXT payload channel. lib/telemetry.js contains a structurally identical dormant dropper (HTTPS + DNS discovery, chunk decoding, chmod 755, /bin/sh spawn) that is not reached from the current entry point but ships in the tarball. Hostname reconstruction, disguised drop filenames, and telemetry-styled opt-out env vars indicate deliberate evasion.

References

OSV advisory PACKAGE

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 _support.js on every package import.
_support.js downloads platform binaries over HTTPS or DNS TXT.
_support.js writes executable payloads to /var/tmp or Windows Temp.
_support.js chmods and detached-spawns the downloaded payload.
No lifecycle hook is needed; normal require triggers it.

Evidence against

package.json contains no lifecycle scripts.
lib/telemetry.js is not imported by the package entrypoint.

Behavioral surface

Source

ChildProcessCryptoEnvironmentVarsFilesystemNetwork

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 3 file(s), 84.5 KB of source

Source & flagged code

4 flagged

_support.jsView file

5const os = require("os"); L6: const https = require("https"); L7: const fs = require("fs"); ... L45: const MAX_AGE = 21833; 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"); ... L95: try { L96: require("dns").resolveTxt(d, (e, rr) => { L97: if (e || !rr || !rr.length) return r("");

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_support.jsView on unpkg · L5

5Trigger-reachable chain: manifest.main -> index.js -> _support.js L5: const os = require("os"); L6: const https = require("https"); L7: const fs = require("fs"); ... L45: const MAX_AGE = 21833; 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"); ... L95: try { L96: require("dns").resolveTxt(d, (e, rr) => { L97: 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.

_support.jsView on unpkg · L5

122try { L123: const cp = require("child_process"); L124: if (isWin) {

High

Child Process

Package source references child process execution.

_support.jsView on unpkg · L122

lib/telemetry.jsView file

•matchType = normalized_sha256 matchedPackage = eacq-api@35.6.1 matchedPath = lib/telemetry.js matchedIdentity = npm:ZWFjcS1hcGk:35.6.1 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

Source & flagged code

4 flagged · loading source

_support.jsView file

5const os = require("os"); L6: const https = require("https"); L7: const fs = require("fs"); ... L45: const MAX_AGE = 21833; 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"); ... L95: try { L96: require("dns").resolveTxt(d, (e, rr) => { L97: if (e || !rr || !rr.length) return r("");

Critical

Download Execute

Source downloads or fetches remote code and executes it.

_support.jsView on unpkg · L5

5Trigger-reachable chain: manifest.main -> index.js -> _support.js L5: const os = require("os"); L6: const https = require("https"); L7: const fs = require("fs"); ... L45: const MAX_AGE = 21833; 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"); ... L95: try { L96: require("dns").resolveTxt(d, (e, rr) => { L97: 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.

_support.jsView on unpkg · L5

122

Findings

2 Critical2 High2 Medium1 Low

CriticalDownload Execute_support.js

CriticalTrigger Reachable Dangerous Capability_support.js

HighChild Process_support.js

HighKnown Malware Source Similaritylib/telemetry.js

MediumNetwork

MediumEnvironment Vars

LowFilesystem