JPCERT/CC analyzed DangerousPassword activity, also known as CryptoMimic or SnatchCrypto, targeting developers at cryptocurrency exchanges across Windows, macOS, and Linux systems. The attackers seeded malicious code into developer-facing Python and Node.js files, including a pyqrcode builder.py and Express route.js/request.js, so execution by an unsuspecting developer downloaded additional malware. On Windows, the chain retrieved MSI payloads, established scheduled one-minute C2 polling, encoded host and process data, and in some cases side-loaded devobj.dll through rdpclip.exe to load PE code in memory. On macOS and Linux, the Python flow decoded log.tmp, reported generated user IDs and OS data to C2, and could receive PythonHTTPBackdoor or JokerSPY-related follow-on code, showing a cross-platform supply-chain-style approach against crypto-development environments.