Why CISOs Should Hunt Phishing Campaigns, Not Just Emails

Jan de Vries · 2026-07-30

If you're a CISO, you know the feeling. Your inbox is a war zone, and every alert is a potential landmine. You've got threat feeds, endpoint detections, and a SOC team that's drowning in a sea of indicators of compromise, or IOCs. It's exhausting, and it's not working as well as it should. The problem isn't a lack of data. It's the way we're looking at it. We're so focused on individual emails that we miss the bigger picture. A single phishing email is just a symptom. The real threat is the campaign behind it. Let's talk about why shifting your mindset from "emails" to "campaigns" can be the game-changer your security team needs. ### The Problem with IOC Fatigue IOC fatigue is real. It's that numbing feeling when your analysts see yet another suspicious URL or malicious attachment. They triage, they block, and they move on. But the attacker just changes a domain or tweaks the payload, and the cycle starts all over again. This whack-a-mole approach burns out your best people and leaves gaps in your defenses. The issue is that IOCs are static. They're snapshots of a specific attack at a specific time. By the time you identify and block one, the attacker has already pivoted. You're always playing catch-up, and your team is always tired. It's a recipe for missed threats and high turnover. ### Thinking in Campaigns Changes Everything When you shift to a campaign-based approach, you stop looking at isolated incidents. Instead, you look at the attacker's behavior, their infrastructure, and their patterns. You ask questions like: What are they trying to achieve? Who are they targeting? What techniques are they using across multiple attempts? This isn't just a nice-to-have. It's a fundamental change in strategy. Campaign-based detection lets you see the forest for the trees. You can spot a coordinated phishing wave before it hits the majority of your users. You can identify a new lure or a cleverly disguised landing page and shut it down proactively. ### How Campaign Detection Works in Practice Think of it like this: an email is a single bullet, but a campaign is the sniper's plan. You can dodge a bullet, but you need to find the sniper to stop the attack. Campaign detection pulls together multiple signals to paint that full picture. - **Correlation across users:** If 50 employees receive similar emails with slight variations, that's a campaign, not 50 random attacks. - **Infrastructure tracking:** Attackers reuse domains, hosting providers, and certificate fingerprints. Tracking these links reveals the broader operation. - **Behavioral analysis:** Look for patterns in login attempts, data access, or even the timing of emails. These clues often tie separate IOCs together. - **Automated enrichment:** Tools like Cofense enrich each sighting with threat intelligence, connecting dots that would otherwise remain hidden. ### The Payoff: Better Visibility, Faster Response When you think in campaigns, visibility improves dramatically. Instead of a list of hundreds of unrelated IOCs, you get a few clear campaign narratives. This makes it easier to communicate risk to the board and to justify security investments. You can say, "We're facing a coordinated credential phishing wave targeting finance," instead of, "We saw some suspicious emails." Response times also shrink. Because you understand the campaign's scope, you can apply broad, effective blocks. You can update your email gateway rules, patch vulnerable systems, and retrain specific user groups before they even see the next wave. This proactive stance is far more effective than reacting to each email as it lands. ### Reducing Analyst Burnout Ultimately, this approach is kinder to your team. Instead of chasing a thousand rabbits, they're tracking a few foxes. The work becomes more strategic and less mundane. Analysts can focus on complex investigations and threat hunting, which is far more satisfying than clicking "quarantine" all day. This reduces fatigue, improves retention, and makes your security operations center a better place to work. As the threat landscape evolves, so must our defenses. The era of just blocking IOCs is over. It's time to embrace a campaign-based mindset. It's not just a technical improvement; it's a strategic necessity. Your team will be more effective, your defenses will be stronger, and you'll finally get some relief from that relentless fatigue.