Cisco’s Talos cyber intelligence unit have released a free decryption tool for PyLocky Ransomware victims. The tool works for everyone, but it has a huge limitation. To successfully recover your files, you must have captured the initial network traffic (PCAP file) between the malware and its command-and-control (C2) server, which generally nobody purposely does. To avoid detection by sandbox security software, the ransomware sleeps for 999.999 seconds or just over 11 and a half days if the affected system’s total visible memory size is less than.
Source: https://thehackernews.com/2019/01/pylocky-free-ransomware-decryption.html