Ransomware, Trojan and Miner together against “PIK-Group” February 28, 2019 https://marcoramilli.com/2019/02/28/ransomware-trojan-and-miner-together-against-pik-group/
Great example of a 0-day targeted attack. None of the hashes listed in the article are detected on VT. -EDIT- No 0-day attack. Attacker just created polymorphic versions to escape any hash detection methods. Hence the non-detection on VT by hash.