What Is Cyber Threat Intelligence (CTI)?

Cyber threat intelligence helps security teams connect what is happening outside the organization to what they need to watch for inside their environment. Instead of treating every alert, vulnerability, or suspicious domain the same way, teams use CTI to understand which threats are most relevant and what action to take next.

Threat intelligence is the broader discipline of collecting and analyzing information about potential threats. Zooming in a bit, cyber threat intelligence applies that discipline to cyber threats such as malware campaigns, phishing infrastructure, exploited vulnerabilities, exposed credentials, and attacker behavior.

That distinction matters in day-to-day security work, as CTI helps answer practical questions like:

• Which alerts need attention first?
• Which vulnerabilities are actively being exploited?
• Which attacker techniques should detections look for?
• Which indicators are relevant to our environment?
• Which threat trends should leadership understand?

Cyber threat intelligence is most valuable when it’s timely, relevant, and connected to a decision. A list of suspicious IP addresses is threat data. CTI explains why those IPs matter, how confident the team is, what activity they’re tied to, and what defenders should do with that information.

What cyber threat intelligence includes

CTI combines technical evidence with context. The goal is not just to collect more data, but to understand how different pieces of threat activity fit together.

Indicators of compromise

Indicators of compromise (IOCs) are technical signs that may point to malicious activity. These can include:

• IP addresses
• Domains
• URLs
• File hashes
• Email addresses
• Malware signatures
• Suspicious registry keys or filenames

IOCs can help teams detect known malicious activity, but they have limits. Attackers can change infrastructure quickly, so indicators are most useful when paired with context about the threat actor, campaign, or behavior behind them.

Tactics, techniques, and procedures

Tactics, techniques, and procedures (TTPs) describe how attackers operate. Tactics refer to what an attacker is trying to accomplish, such as gaining initial access or moving laterally. Techniques and procedures describe how they do it.

Mapping CTI to the MITRE ATT&CK Framework can help security teams understand attacker behavior in a structured way. That makes CTI useful for detection engineering, threat hunting, and response planning.

Threat actor and campaign context

CTI may also include information about known or suspected threat actors, their motives, common targets, preferred tools, and active campaigns. This context helps teams understand whether a threat is likely to affect their industry, geography, technology stack, or business model.

For example, intelligence about a ransomware group targeting healthcare organizations may be more urgent for a hospital network than for a software company. Relevance is what turns broad threat reporting into useful security guidance.

Vulnerability exploitation context

Not every vulnerability carries the same level of risk. CTI helps teams understand which vulnerabilities attackers are discussing, scanning for, weaponizing, or actively exploiting.

That context supports vulnerability prioritization by helping teams move beyond severity scores alone. A medium-severity vulnerability with confirmed exploitation may require faster action than a higher-scoring issue with no known attacker interest. Related concepts like common vulnerabilities and exposures (CVEs) help teams track and reference known software flaws consistently.

How CTI supports cybersecurity workflows

Cyber threat intelligence becomes useful when it improves the work security teams already do. It can support detection, investigation, response, and risk reduction across the security operations lifecycle.

Detection engineering

Detection engineering teams use CTI to decide which behaviors and signals to monitor. Rather than writing detections only around known indicators, teams can use adversary TTPs to identify suspicious patterns that may continue even when attackers change infrastructure.

For example, CTI about a phishing campaign may include malicious domains, but it may also describe attachment types, redirect behavior, credential-harvesting pages, and post-compromise activity. Those details help teams build stronger threat detection logic.

SOC triage and investigation

SOC analysts often face large volumes of alerts. CTI gives them added context so they can separate routine noise from activity that may require escalation.

An alert involving a suspicious domain is more meaningful if CTI shows that the domain is tied to an active malware campaign. A failed login attempt may become more urgent if the username appears in exposed credential data from the dark web.

Threat hunting

Threat hunting uses hypotheses to search for hidden or missed threats. CTI can help hunters decide what to look for.

A hunt might begin with intelligence that a threat actor commonly uses a specific PowerShell technique after gaining access. Hunters can then search endpoint, identity, and network telemetry for signs of that behavior, even if no alert has fired.

Incident response

During incident response (IR), CTI helps responders understand what they may be dealing with. If an observed indicator matches known campaign activity, responders can look for related tools, infrastructure, persistence methods, or lateral movement patterns.

CTI doesn’t replace forensic investigation, but it can speed up scoping and help teams anticipate likely next steps.

SIEM enrichment

Security information and event management (SIEM) platforms collect and correlate logs, with CTI able to enrich that log data with external threat context.

For example, a SIEM alert may show a connection to an unfamiliar domain. CTI can add context about whether that domain is newly registered, associated with malware delivery, or connected to known phishing activity.

CTI examples in practice

Phishing campaign detection

A security team receives intelligence about a phishing campaign using lookalike domains and credential-harvesting pages. The CTI includes domains, URLs, email subject patterns, and attacker infrastructure.

The team can use that intelligence to block domains, tune email detections, search for prior user exposure, and warn teams most likely to be targeted.

Ransomware preparedness

CTI shows that a ransomware group is exploiting a specific vulnerability and using several known post-exploitation techniques. The security team can prioritize patching, check for signs of exploitation, update detections, and prepare response playbooks for likely attacker behavior.

Exploited vulnerability prioritization

A vulnerability management (VM) team has hundreds of open findings. CTI shows that one vulnerability is being actively exploited in the wild. That context can move the issue higher in the remediation queue, especially if the affected system is internet-facing or supports a critical business process.

Credential exposure monitoring

CTI identifies employee credentials circulating in criminal marketplaces. The security team can force password resets, review login activity, strengthen multi-factor authentication (MFA) controls, and investigate whether the credentials were used for unauthorized access.

Cyber threat intelligence vs. related concepts

Cyber threat intelligence overlaps with several security capabilities, but isn’t the same thing as the tools or workflows it supports.

• Cyber threat intelligence vs. threat intelligence: Threat intelligence is the broader discipline. Cyber threat intelligence applies that discipline to cyberattacks, attacker infrastructure, malware, vulnerabilities, credentials, and security operations.
• Cyber threat intelligence vs. threat intelligence feeds: Threat intelligence feeds provide streams of threat data, such as indicators or reputation lists. CTI adds analysis, relevance, confidence, and recommended action.
• Cyber threat intelligence vs. threat intelligence platforms: A threat intelligence platform (TIP) helps collect, organize, enrich, and share intelligence. CTI is the intelligence itself and the analysis that makes it useful.
• Cyber threat intelligence vs. threat hunting: CTI helps teams decide what to hunt for. Threat hunting is the active search for signs of compromise or suspicious behavior.
• Cyber threat intelligence vs. vulnerability management: VM identifies and remediates weaknesses. CTI helps teams understand which weaknesses attackers are most likely to use.