MAL-2026-13775 Malicious code in permit2 (npm)

permit2 is a malicious npm package that squats the bare name of Uniswap's Permit2 token-approval system (whose legitimate npm distribution is the scoped @uniswap/permit2-sdk), advertising itself as a "smart contract development toolkit." The package contains no real functionality — the published tarball ships only a package.json and an install-time payload (index.js), which both preinstall and postinstall execute via node index.js, so it runs automatically on npm install.

The payload is a more aggressive variant of the infostealer used across the mssjeep843 DeFi-impersonation campaign and exfiltrates to the same webhook.site endpoint. It collects environment variables whose names match a broadened secret pattern (KEY|TOKEN|SECRET|PASS|PRIVATE|MNEMONIC|RPC|AWS|GITHUB|NPM|KUBE|VAULT|AUTH|PGP|GPG|SEED|WALLET|BEARER|API|INFURA|ALCHEMY|HELIUS|QUICKNODE|ANKR|PRIVATE_KEY) and, rather than merely listing credential directories, reads and exfiltrates the full contents (up to 4000 bytes each) of a wide set of credential and key files: ~/.aws/credentials and ~/.aws/config, SSH private keys (~/.ssh/id_rsa, ~/.ssh/id_ed25519) and ~/.ssh/config, ~/.kube/config, ~/.docker/config.json, ~/.netrc, ~/.pgpass, ~/.npmrc, ~/.pypirc, ~/.gitconfig, ~/.git-credentials, GCP application-default and legacy credentials, Solana/Anchor keypairs (id.json), NEAR credentials, the Sui keystore, up to three Foundry keystore files, and .env/.env.local/.env.production/.env.development/secrets.env from the current working directory. It also captures the hostname, username, cwd and platform. The JSON is POSTed over HTTPS to https://webhook.site/326b0891-2093-4800-a4c1-686ce3e07b09, with errors swallowed so the install never visibly fails. Any host that installed this package should treat SSH keys, cloud credentials, wallet keystores and .env secrets as compromised and rotate them.

The npm package 'permit2' (a name-squat of Uniswap's Permit2) ships an index.js that is registered as both preinstall and postinstall in package.json. On install, index.js enumerates environment variables matching KEY/TOKEN/SECRET/PRIVATE/MNEMONIC/AWS/GITHUB/NPM and reads installer-owned credential files including ~/.aws/credentials, ~/.ssh/id_*, ~/.npmrc, ~/.kube, ~/.docker, ~/.netrc, ~/.gitconfig, gcloud/solana/sui/anchor credentials, foundry keystores, and local.env files. The collected data is POSTed via https.request to a hardcoded attacker endpoint at webhook.site (path /326b0891-2093-4800-a4c1-686ce3e07b09). The upload is deferred 60-240 seconds inside a detached child process (spawn with detached:true, stdio:'ignore') to outlive install/scanner windows, and the script early-exits if os.hostname()/user matches sandbox patterns (scan-, detonation, sandbox, ubuntu-fc-uvm) or if the npm registry points at a mirror. The package ships no functionality matching its self-description as a 'smart contract development toolkit'.