@nasdtickets/common @1.0.23

Summary

build/index.js (the package main) appends a hidden eval(atob('...')) block after the legitimate __exportStar boilerplate, separated by a long run of tab characters to push it off-screen in editors. On every require/import of the package, the decoded payload queries an Ethereum RPC/Blockscout endpoint for the latest transaction of the hardcoded EOA 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, interprets the 20-byte tx.to address as two encoded IPv4 addresses, and issues HTTP requests to http://<resolved-ip>:443/0x/cls and http://<resolved-ip>:443/0x/ls. The response carries a payload in the x-payload-b64 header that is XOR-decoded and then executed via spawn('node', ['-e', <decoded>], {detached: true, stdio: 'ignore', windowsHide: true}).unref(), launching a detached hidden Node process on the installer's machine. Module identifiers such as 'http', 'https', 'child_process', and 'spawn' are unicode-escaped (\u00XX) to further hide the behavior. The combination of on-chain C2 resolution (resistant to DNS/domain takedown), multi-layer obfuscation, and hidden detached process execution on import is a remote-code-execution supply-chain attack against any project that installs this version.

Source: amazon-inspector (d260e32207d8cb161b0a72f1337a42c9755b9550a8eda1e70f0b4182273d476b)