Cybercrime: APT-C-23 spreads Android spyware via fake Threema-Telegram ESET cybersecurity experts: The cyber espionage group’s new malware, SpyC23.A, has extended functionality. It exploits… Cybercrime: APT-C-23 spreads Android spyware via fake Threema-Telegram 2 October 2020 Francesco Bussoletti Cyber, Defence and Security ESET cybersecurity experts: The cyber espionage group’s new malware, SpyC23.A, has extended functionality. It exploits a fake app store to distribute it.