JPCERT/CC Blog: Decrypting Strings in Emdivi

*Executive summary:* JPCERT/CC presents a technical walkthrough of Emdivi's encrypted string handling and key derivation, documents that different Emdivi versions use XxTEA or AES (and sometimes reversed operations), and provides an IDAPython script (emdivi_string_decryptor.py) with usage instructions and limitations to recover URLs and other embedded artifacts useful for incident response and malware analysis.