: Often an IP from a known malicious range or a private network address that shouldn't be sending external mail.
Check the Return-Path and From fields. In many versions of this challenge: mail access_4.txt
: Look for base64 encoded strings in the Subject: field; decoding these often reveals the hidden flag. Common Findings in this Challenge : Often an IP from a known malicious
In this challenge, you are provided with a text file containing raw email logs. The objective is usually to identify the of a suspicious login or the spoofed sender of a phishing email. 1. Examine the Received Headers mail access_4.txt
: The answer is often the IPv4 address found in the first Received hop (e.g., 192.168.x.x ).