* D (4: HTTPS traffic to an external IP - 5.29.1.5)
* The log entry shows an internal system (172.16.1.30) communicating with an external IP (5.29.1.5) over TCP 443 (HTTPS) using Browser.exe.
* HTTPS traffic to an unknown external IP could indicate data exfiltration, as attackers often use encrypted channels to disguise stolen data transfers.
* G (7: FTP traffic to an external backup server - bank.backup.com)
* The log entry indicates that an internal machine (172.16.1.25) is transferring data to bank.backup.
com using FTP (port 21) and FileZilla.
* FTP is a major concern because it is an outdated, unencrypted protocol that can be exploited for data exfiltration. If unauthorized, this could be a serious data breach.
Other Options:
* A (ARP traffic) # Not a concern (Just address resolution)
* B (RPC Kerberos traffic) # Normal for authentication
* C (SMB traffic) # Internal file sharing
* **E (DNS traffic) # Common, though could be exfiltration in some cases, but not in this log)
* F (WUS traffic) # Appears to be Windows Update Service traffic, likely legitimate