A security engineer is troubleshooting a possible virus infection, which may have spread to multiple desktop computers within the organization. The company implements enterprise antivirus software on all desktops, but the enterprise antivirus server's logs show no sign of a virus infection. The border firewall logs show suspicious activity from multiple internal hosts trying to connect to the same external IP address.
The security administrator decides to post the firewall logs to a security mailing list and receives confirmation from other security administrators that the firewall logs indicate internal hosts are compromised with a new variant of the Trojan.Ransomcrypt.G malware not yet detected by most antivirus software. Which of the following would have detected the malware infection sooner?