OPSEC for Blue Teams - Losing Defender's Advantage

This is a three-part blog about OPSEC for Blue Teams. This first part expresses some of my ideas about the risk of alerting the adversary and OPSEC for getting OSINT and context on domains and IPs. The second part is about testing tools (I performed tests on PassiveTotal and VirusTotal) which provide context and/or OSINT in relation to OPSEC. The last part will be on sandboxes, secure communications and sharing of info & data when dealing with a targeted attack.