TrapDoor Supply Chain Attack Spreads Credential-Stealing Malware via npm, PyPI, and CratesIO

Summary

A coordinated cross-ecosystem supply chain attack campaign dubbed TrapDoor has distributed credential-stealing malware across npm, PyPI, and Crates.io, spanning 34+ malicious packages and 384+ versions since May 22, 2026. The campaign targets developers in crypto, DeFi, Solana, and AI communities, stealing secrets, SSH keys, cloud credentials, and wallet data through postinstall hooks, malicious build scripts, and remote JavaScript payloads. Notably, the attack includes novel techniques such as implanting .cursorrules and CLAUDE.md files to trick AI assistants into exfiltrating secrets via GitHub pull requests.

Full text

TrapDoor Supply Chain Attack Spreads Credential-Stealing Malware via npm, PyPI, and CratesIO Ravie LakshmananMay 25, 2026Supply Chain Attack / Malware A new coordinated cross-ecosystem software supply chain attack campaign has targeted npm, PyPI, and Crates.io to distribute credential-stealing malware. The campaign, codenamed TrapDoor, spans more than 34 malicious packages across over 384 versions. The earliest activity was recorded on May 22, 2026, at 8:20 p.m. UTC, with new packages published to the ecosystems in waves from a cluster of accounts in quick succession. "TrapDoor targets developers in crypto, DeFi, Solana, and AI communities," Socket said. "The malicious packages are designed to steal developer secrets, crypto wallets, SSH keys, cloud credentials, browser data, and environment variables." "Several npm packages also deploy a shared payload, trap-core.js, that scans for credentials, validates AWS and GitHub tokens, attempts SSH-based lateral movement, and plants persistence through .cursorrules, CLAUDE.md, Git hooks, shell hooks, systemd, cron, and SSH." It's worth noting that the activity has no connection to another campaign of the same name that HUMAN's Satori Threat Intelligence and Research Team detailed last week as engaging in ad fraud by distributing 455 Android apps through the Google Play Store. The list of identified packages is below - Crates.io move-analyzer-build move-compiler-tools move-project-builder sui-framework-helpers sui-move-build-helper sui-sdk-build-utils npm async-pipeline-builder build-scripts-utils chain-key-validator crypto-credential-scanner defi-env-auditor defi-threat-scanner deployment-key-auditor dev-env-bootstrapper eth-wallet-sentinel llm-context-compressor mnemonic-safety-check model-switch-router node-setup-helpers project-init-tools prompt-engineering-toolkit solidity-deploy-guard token-usage-tracker wallet-backup-verifier wallet-security-checker web3-secrets-detector workspace-config-loader PyPI cryptowallet-safety data-pipeline-check defi-risk-scanner env-loader-cli eth-security-auditor git-config-sync solidity-build-guard The operation is notable for its diverse delivery paths, using postinstall hooks, remote JavaScript payloads that are executed during package imports, and malicious build.rs scripts to target Sui and Move developers. The packages masquerade as seemingly harmless tools, giving attackers the ability to reach a broad audience. The npm packages have been found to run a JavaScript payload ("trap-core.js"), which scans for credentials and developer secrets, validates stolen credentials using AWS and GitHub API calls, and creates persistence on the host using cron jobs, systemd services, Git hooks, and moves across the network via SSH. The Rust crates, in a similar fashion, search for local keystores, encrypt the data using a hardcoded XOR key, and exfiltrate it to GitHub Gists. The packages are also noteworthy for the use of a build script ("build.rs") to trigger the execution of the malicious code. The Python packages associated with TrapDoor are designed such that they are auto-executed on import. The primary goal of the packages is to download JavaScript from an attacker-controlled GitHub Pages domain ("ddjidd564.github[.]io"), and run it using "node -e." "This technique allows the Python package to delegate execution to a remote JavaScript payload, giving the attacker more flexibility after publication," Socket explained. "By hosting the payload externally, the attacker can update behavior without publishing a new PyPI release." An unusual aspect of the campaign is the implanting of .cursorrules and CLAUDE.md containing hidden instructions to trick artificial intelligence (AI) assistants into running a "security scan" that results in secret discovery and exfiltration. This is achieved by opening GitHub pull requests (PRs) across popular AI and developer projects, including "browser-use/browser-use," "langchain-ai/langchain," and "langflow-ai/langflow." The PR activity indicates that TrapDoor extends beyond pushing malicious packages to open-source ecosystems. Socket said the threat actor is likely testing whether AI-related project files can be introduced through regular open-source contribution workflows, thereby causing AI coding tools to parse those hidden instructions and apply them. The findings once again demonstrate how threat actors are increasingly targeting developer workflows, aiming to steal a wide range of information that could make it possible to burrow deeper into target environments for follow-on attacks. "TrapDoor shows how attackers are combining traditional package typosquatting with newer developer-environment attack paths," Socket said. "The package names are tailored to appear relevant to crypto development, AI tooling, local environment setup, and security workflows. The malware then uses ecosystem-specific execution paths: build.rs in Rust, postinstall hooks in npm, and import-time execution in Python." Found this article interesting? 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Indicators of Compromise

• domain — ddjidd564.github.io
• malware — TrapDoor
• malware — trap-core.js

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