*Cryptowall by Malpedia CryptoWall is a ransomware, is usually spread by spam and phishing emails, malicious ads, hacked websites, or other malware and uses a Trojan horse to deliver the malicious payload. Cryptowall Updated 8 days ago by Malpedia trusted CryptoWall is a ransomware, is usually spread by spam and phishing emails, malicious ads, hacked websites, or other malware and uses a Trojan horse to deliver the malicious payload.