Threat Intelligence Blog
Research, insights, and updates from the isMalicious team.
Domain Lookup for Phishing and C2 Infrastructure Detection
Phishing campaigns and malware operations depend on domain infrastructure that leaves detectable traces. Learn how advanced domain lookup techniques help security teams uncover phishing sites and command-and-control servers before they compromise your organization.
Real-Time IP Reputation Check: Stop Cyber Threats at the Network Edge
Real-time IP reputation checks give you the power to identify and block malicious actors the moment they connect to your systems. Discover how to implement automated threat detection that works at machine speed, not analyst speed.
Domain Lookup: How to Identify Malicious Websites Before They Strike
Malicious websites are the launchpad for phishing, malware distribution, and credential theft. Learn how domain lookup tools use reputation data, WHOIS analysis, and threat feeds to identify dangerous domains before your users click.
IP Lookup for Cyber Threat Detection: A Complete Security Guide
Learn how IP lookup works as a frontline defense against cyber threats. Discover how to use IP reputation data, threat intelligence feeds, and automated checks to block malicious actors before they reach your systems.
Watering Hole Attacks: Compromising the Sites Your Victims Already Trust
Instead of spear-phishing individuals, APTs infect websites their targets routinely visit. Learn how watering hole campaigns work and how to harden web supply chains and detection.
Cognitive Hacking: The Battle for Your Mind
Cognitive hacking targets the user, not the machine. It manipulates perception and decision-making through disinformation and psychological triggers.
SIM Swapping and Telecom Fraud: When Your Phone Number Is the Weakest Factor
Attackers who control your mobile number can bypass SMS-based 2FA and reset passwords. Learn how SIM swap fraud works and how to reduce reliance on SMS one-time codes.
Malvertising and Search Poisoning: Threats Hiding in Plain Sight
Malicious ads and manipulated search results push users toward malware and phishing without email. Learn how malvertising and SEO poisoning work and how teams can reduce risk.
Living Off the Land (LOTL): Why “No Malware File” Still Means Breach
Attackers increasingly abuse built-in OS binaries and scripts to avoid dropping traditional malware. Understand LOTL tradecraft and what to log, detect, and hunt for.
The Splinternet: Navigating a Fragmented World Wide Web
The global internet is fracturing into regional, regulated intranets. We explore the rise of the "Splinternet" and its impact on cybersecurity and global business.
IDN and Homograph Phishing: When the Domain Looks Right But Is Wrong
Internationalized domain names and look-alike characters let attackers spoof trusted brands in the address bar. Learn how homograph attacks work and how to defend users and SOC teams.
DNS Security: Poisoning, Hijacking, and Hardening That Actually Sticks
DNS is easy to ignore until it routes your users to malware. Learn how cache poisoning, hijacking, and secure DNS practices fit together.
Incident Response Playbooks: Less PDF, More Rehearsal
A playbook nobody has run is fiction. Learn how to build IR phases, roles, and communications that work under pressure—and how to test them.
Steganography: Hiding Secrets in Plain Sight
Steganography hides data within innocent-looking files like images or audio. Learn how hackers use digital steganography to smuggle malware and steal data.
Identity Security in 2026: Passkeys, MFA, and Session Hijacking
Passwords are still everywhere, but phishing-resistant credentials and tight session controls are the real front line. Here is a practical identity roadmap.
SBOM and Supply Chain Security: What Security Teams Actually Need
Software bills of materials are not paperwork for compliance alone. Learn how SBOMs reduce third-party risk and speed response when a dependency blows up.
Ransomware Resilience: Why Immutable Backups Still Matter in 2026
Attackers target backups first. Learn how immutable storage, the 3-2-1 rule, and recovery drills turn ransomware from a business-ending event into a manageable incident.
Polymorphic Malware: The Shapeshifting Code
Traditional antivirus relies on signatures, but polymorphic malware changes its code every time it replicates. Discover how this shapeshifting threat evades detection.
Synthetic Identity Fraud: The Ghost in the Machine
Synthetic identity fraud is the fastest-growing financial crime. Learn how criminals combine real and fake data to create "ghost" identities and how to detect them.
Preparing for Q-Day: Post-Quantum Cryptography Explained
Quantum computers threaten to break the encryption that secures the internet. Discover what Post-Quantum Cryptography (PQC) is and how to prepare for the quantum future.
Detecting the Enemy Within: Behavioral Analytics for Insider Threats
Insider threats are notoriously difficult to detect because the actor already has legitimate access. Learn how UEBA can help spot the subtle signs of malicious intent.
Botnets Explained: Is Your Computer Part of a Zombie Army?
Botnets are networks of infected devices controlled by cybercriminals. Find out how they work, what they do, and how to check if your IP is involved.
CSPM vs. CWPP: Decoding Cloud Security Acronyms
Cloud security is full of acronyms. We break down the difference between CSPM and CWPP and why you likely need both.
The Rise of API Attacks: Protecting the Modern Attack Surface
APIs are the connective tissue of the modern web, and they are under attack. Explore the unique vulnerabilities of APIs and how to secure them.
Implementing Zero Trust: Beyond the Buzzword
Zero Trust is not a product; it is a philosophy. Learn how to move beyond the marketing hype and implement a true "Verify Explicitly" architecture.
How Hackers Use "Typosquatting" to Trick You (and How to Spot It)
Typosquatting relies on your fingers slipping. Learn how attackers register look-alike domains to steal your data and how to check URLs before you click.
Automated Threat Classification using Machine Learning
Machine Learning is transforming how we classify threats. Discover how AI models can analyze vast amounts of data to categorize attacks instantly.
Integrating MITRE ATT&CK with Real-Time Threat Feeds
Bridge the gap between strategic frameworks and tactical defense. Learn how to map real-time threat feeds directly to the MITRE ATT&CK matrix.
The Evolution of Threat Intelligence in 2026
Threat intelligence has moved beyond simple blocklists. Explore how AI, context, and real-time integration are shaping the future of cyber defense.
The Dark Web vs. Deep Web: Where Do Cyber Threats Hide?
Confused by the Dark Web and Deep Web? We explain the difference and where cyber threats like stolen credentials and malware actually live.
Mapping Your Defenses with MITRE ATT&CK
The MITRE ATT&CK framework is the gold standard for understanding adversary behavior. Discover how to map your defenses to specific techniques.
Understanding Threat Classification: A Guide for Modern SOCs
Effective threat classification is the cornerstone of a modern SOC. Learn how to categorize threats to streamline incident response and reduce alert fatigue.
Is Your Email Leaking Data? How to Check Email Reputation
Learn why email reputation matters for security and deliverability, and how to check if an email address is compromised or malicious.
What is a C2 Server? The Invisible Puppet Masters of the Internet
Discover how hackers control infected devices using Command and Control (C2) servers and how to detect these hidden threats.
Space Systems Cyber Threats: Securing the Final Frontier
As space becomes accessible, it becomes a target. From satellite hijacking to ground station jamming, we analyze the unique threats to orbital assets and how threat intelligence secures the new space race.
Command & Control Infrastructure: Detecting C2 Traffic Before It Is Too Late
Once malware establishes a C2 channel, attackers have a persistent foothold in your environment. Understand how C2 infrastructure is built, how beacons evade detection, and how to identify malicious outbound connections using threat intelligence.
Metaverse Security: Privacy and Identity in Virtual Worlds
As the enterprise Metaverse expands, so does the attack surface. From avatar impersonation to spatial data theft, we explore the new frontier of virtual threats and how IP reputation protects digital assets.
Threat Intelligence Sharing: How Organizations Fight Back Together
No single organization can monitor every threat alone. Learn how information sharing communities (ISACs), standard protocols like STIX/TAXII, and commercial threat feeds form a collaborative shield against adversaries.
Detecting VPNs, Proxies & Tor: The Hidden Threat in Anonymized Traffic
Legitimate users rarely hide behind Tor or anonymous proxies. Discover how attackers exploit anonymization layers to bypass defenses, and how IP intelligence helps you unmask high-risk traffic in real-time.
Credential Stuffing Attacks: Why Stolen Password Lists Keep Working
Billions of breached username/password pairs are actively weaponized every day. Learn how credential stuffing differs from brute force, why it succeeds at scale, and how to stop it using IP reputation and anomaly detection.
Drone Defense Security: Mitigating Unauthorized UAV Threats
Unauthorized drones pose a threat to critical infrastructure, stadiums, and prisons. This post explores Counter-Unmanned Aircraft Systems (C-UAS), detection methods, and how strict "no-fly" zones are enforced electronically.
Building a Custom SOC Dashboard: Integrating Real-Time Threat Feeds
Enhance your Security Operations Center visibility. A step-by-step guide to aggregating threat data, enriching logs, and building custom security dashboards using modern Threat Intelligence APIs.
Why Your SaaS Needs to Block Disposable Email Addresses Immediately
Disposable and temporary email addresses are the gateway for fraud, spam, and abuse. Learn how implementing a robust email verification API protects your user base and improves your sender reputation.
How to Automate Malicious IP Blocking with Threat Intelligence APIs
Stop relying on static blocklists. Learn how to integrate real-time threat intelligence APIs into your firewalls and application logic to automatically detect and block malicious IP addresses before they strike.
Smart City Security: Protecting Critical Infrastructure from Cyber Attack
Connected traffic lights, sensors, and water systems create a vast attack surface in modern cities. We examine the vulnerabilities of smart city infrastructure and the cascading failures a cyberattack could cause.
Domain Reputation Scoring: The First Line of Defense Against Phishing
Not all domains are created equal. Discover how real-time domain reputation scoring helps organizations proactively identify and block phishing infrastructure, fake websites, and parked domains used by cybercriminals.
Biometric Spoofing: Defeating Authentication in an AI World
Are fingerprints and facial recognition truly secure? We explore the techniques attackers use to spoof biometric sensors, from 3D-printed faces to synthetic voice cloning.
Industrial Control Systems (ICS) Malware Trends: The OT/IT Convergence Risk
Operational Technology (OT) environments are under siege. We analyze the latest ICS-specific malware strains targeting PLCs and SCADA systems, and offer defense strategies for critical infrastructure.
Satellite Internet Security: Vulnerabilities in Low Earth Orbit (LEO)
Attack surfaces expand vertically as LEO constellations integrate with enterprise networks. This post details orbital jamming, ground station spoofing, and the lack of encryption standards in commercial satellite systems for security engineers.
Quantum Computing Threats to Encryption: A 2026 Perspective
As quantum supremacy nears, the threat to RSA and ECC encryption becomes existential. This analysis explores Post-Quantum Cryptography (PQC) migration strategies for security teams and the immediate risks of Harvest Now, Decrypt Later (HNDL) attacks.
Penetration Testing vs. Vulnerability Scanning: What's the Difference?
Often confused, these two security practices serve very different purposes. Discover when to use automated scanning and when to invest in a manual penetration test.
isMalicious vs VirusTotal: A Modern Threat Intelligence Alternative
Comparing isMalicious and VirusTotal for threat intelligence. Discover which IP and domain reputation API is right for your security stack — from pricing and features to real-time streaming and monitoring.
Building an Effective Incident Response Plan: A Step-by-Step Guide
When a cyberattack strikes, panic is your enemy. Learn how to create and test an incident response plan to ensure your team knows exactly what to do.
isMalicious vs AbuseIPDB: IP Reputation and Beyond
AbuseIPDB is the go-to for IP reputation, but what about domains and URLs? Compare isMalicious and AbuseIPDB across coverage, API features, pricing, and monitoring to find the right threat intelligence tool for your stack.
Cyber Threats 101: Understanding Online Dangers
A beginner's guide to common cyber threats. Understand malware, viruses, and hackers, and learn how to protect yourself online.
How to Check IP Reputation: Is That IP Address Safe?
Learn how to check if an IP address is malicious. A simple guide for beginners to understand IP reputation and stay safe online.
IAM Best Practices: Securing Identity and Access
Identity is the new perimeter. Discover specific best practices for Identity and Access Management (IAM) to prevent unauthorized access and privilege escalation.
Malicious Domains vs. Safe Sites: How to Tell the Difference
Can you tell a malicious domain from a safe one? Learn the key differences and tools to verify website safety instantly.
Phishing Explained: How to Check a Domain for Threats
What is phishing? Learn how to spot fake websites and check domains for threats before you enter your personal information.
Safe Browsing Guide: How to Check URLs for Hidden Threats
Don't click that link yet! Learn how to check URLs for hidden threats and ensure safe browsing on any device.
isMalicious vs AlienVault OTX: Threat Intelligence Without Vendor Lock-In
AlienVault OTX offers a free threat intelligence community, but full value requires the AT&T ecosystem. Compare isMalicious and OTX on API access, integrations, and vendor independence for your security stack.
Healthcare IoT Security: The Critical Risk to Patient Safety
Connected medical devices (IoMT) introduce life-critical vulnerabilities into hospital networks. From MRI machines to insulin pumps, this guide analyzes the unique challenges of securing legacy firmware and unpatched operating systems.
isMalicious vs Shodan: Threat Reputation vs Attack Surface Discovery
Shodan maps internet-connected devices. isMalicious checks if IPs and domains are malicious. Compare these complementary threat intelligence tools across features, use cases, and pricing to choose the right one.
The Deepfake Threat: Protecting Enterprise Security in the Era of AI
AI-generated video and audio are becoming indistinguishable from reality. Explore the rising threat of deepfakes to enterprise security and how to defend against synthetic media attacks.
Anatomy of Phishing Infrastructure: How Attackers Build Their Trap
Peel back the layers of a modern phishing attack. From spoofed domains to SSL certificates, understand the infrastructure attackers use and how to detect it.
Automating Threat Intelligence: Speed is Your Best Defense
Manual analysis cannot keep up with machine-speed attacks. Learn how to automate threat data ingestion and response to block threats in milliseconds, not minutes.
Contextual Threat Intelligence: Moving Beyond Static Blacklists
Static IP blacklists are no longer enough. Discover the power of contextual threat intelligence—connecting IPs, domains, and behavior to see the full attack picture.
Domain Age as a Risk Indicator: Why "New" Often Means "Danger"
Newly registered domains (NRDs) are a favorite tool for threat actors. Learn why domain age is a critical signal in your threat intelligence stack and how to use it effectively.
The Hidden Cost of Bad IP Reputation: Why Ignoring It Drains Your Budget
Discover how poor IP reputation impacts more than just security—it affects email deliverability, ad spend, and customer trust. Learn why proactive monitoring is a financial necessity.
Best Threat Intelligence APIs Compared (2026): The Complete Guide
A comprehensive comparison of the top threat intelligence APIs in 2026 — isMalicious, VirusTotal, AbuseIPDB, AlienVault OTX, Shodan, and URLhaus. Feature matrices, pricing breakdowns, and recommendations by use case.
Navigating Data Privacy: GDPR, CCPA, and Cybersecurity Compliance
Privacy regulations are reshaping cybersecurity strategies. Understand the key requirements of GDPR and CCPA and how to align your security program with privacy compliance.
Automotive Cybersecurity: Hacking Connected Cars in 2026
With cars becoming data centers on wheels, the attack surface expands into the powertrain, infotainment, and OTA update systems. We analyze CAN bus injection vulnerabilities and the security risks of V2X communication protocols.
API Security Best Practices: Defending Against the OWASP Top 10
APIs are the backbone of modern applications but are often left vulnerable. Learn how to secure your APIs against common attacks like broken object level authorization and injection.
Threat Hunting: Proactive Security Detection Beyond Automated Alerts
Waiting for alerts means waiting for attacks to succeed. Learn how proactive threat hunting helps security teams discover hidden threats, improve defenses, and stay ahead of sophisticated adversaries.
Shadow IT Risk Management: Securing Unauthorized Applications and Services
Employees use unauthorized apps and services that IT cannot see. Learn how to discover shadow IT, assess risks from unsanctioned tools, and implement governance without stifling innovation.
DevSecOps: Integrating Security into the CI/CD Pipeline
Security should not be an afterthought. Learn how to implement DevSecOps to automate security testing and vulnerability scanning within your development workflow.
Lateral Movement Detection: Stopping Attackers from Spreading Through Your Network
After initial compromise, attackers move laterally to reach valuable targets. Learn how to detect lateral movement techniques, implement segmentation, and stop attackers before they reach critical assets.
IoT Security Threats: Protecting Your Smart Devices from Cyberattacks
Internet of Things devices are increasingly targeted by cybercriminals. Learn how to identify IoT vulnerabilities, secure smart devices, and protect your network from IoT-based attacks.
Insider Threat Detection: Identifying and Managing Employee Security Risks
Insider threats pose unique challenges to organizational security. Learn how to detect malicious insiders, prevent data leakage, and build an effective insider threat program.
Email Authentication: Implementing DMARC, SPF, and DKIM for Email Security
Email spoofing enables phishing and business email compromise attacks. Learn how DMARC, SPF, and DKIM authentication protocols protect your domain from being impersonated in cyberattacks.
What is EDR? A Guide to Endpoint Detection and Response
Traditional antivirus is no longer enough. Explore why Endpoint Detection and Response (EDR) is essential for modern cybersecurity and how it differs from legacy solutions.
DDoS Attack Prevention: Strategies to Protect Your Online Services
Distributed Denial of Service attacks can cripple your online presence. Learn how to identify DDoS threats, implement effective mitigation strategies, and maintain service availability during attacks.
Data Exfiltration Prevention: DLP Strategies to Protect Sensitive Information
Data theft can occur through countless channels. Learn how to detect and prevent data exfiltration, implement effective DLP strategies, and protect your organization most valuable assets from leaving your control.
Dark Web Monitoring: Protecting Your Brand and Detecting Leaked Data
Stolen credentials and sensitive data often surface on the dark web before being exploited. Learn how dark web monitoring helps detect breaches early and protect your organization from cybercriminal activities.
Container and Kubernetes Security: Protecting Cloud-Native Applications
Container environments introduce unique security challenges. Learn how to secure Docker containers, Kubernetes clusters, and cloud-native applications from emerging threats and misconfigurations.
Beyond Phishing: Modern Social Engineering Tactics
Social engineering has evolved beyond simple phishing emails. Discover the latest tactics used by attackers, including vishing, smishing, and pigmenting, and how to spot them.
Mobile App Security: Protecting iOS and Android Applications
Mobile applications are prime targets for cybercriminals. Learn about common mobile security threats and how to protect your iOS and Android apps from reverse engineering and malware.
Infostealer Malware: How Credentials End Up on the Dark Web
Infostealers harvest credentials and sensitive data from infected systems, fueling a massive underground economy. Learn how these threats operate, how to detect them, and how to protect your organization from credential theft.
CTF and Bug Bounty Toolbox: Essential OSINT for Security Research
Master the reconnaissance phase of CTFs and bug bounties with these essential OSINT tools. From IP investigation to domain intelligence, build the toolbox that helps you find what others miss.
Threat Intelligence for Small Business: Enterprise Security on a Budget
Small businesses face the same cyber threats as enterprises but with a fraction of the resources. Learn how affordable threat intelligence and smart security strategies can level the playing field.
Cryptocurrency and Web3 Security Threats
The Web3 ecosystem faces unique threats from wallet drainers to rug pulls. Learn how to identify malicious crypto domains, detect scams, and protect yourself and your users from blockchain-based fraud.
Cloud Security Threats: Protecting Multi-Cloud Infrastructure
Cloud environments face unique security challenges from misconfigurations to cryptomining attacks. Learn how to monitor cloud assets, detect threats, and protect your multi-cloud infrastructure with threat intelligence.
Bot Detection and Account Takeover Prevention
Automated bots drive credential stuffing, account takeover, and fraud at massive scale. Learn how IP reputation and threat intelligence can identify and block malicious automation before it compromises your users.
DNS Security and Threat Intelligence: Blocking Malware at the Resolver
DNS is the first line of defense against malware and phishing. Learn how protective DNS and threat intelligence blocklists can stop threats before they reach your network, with integration guides for Pi-hole, AdGuard, and enterprise DNS.
Business Email Compromise: The Multi-Billion Dollar Threat
BEC attacks cost organizations billions annually through sophisticated impersonation and social engineering. Learn how domain spoofing detection and threat intelligence can protect your organization from CEO fraud and invoice scams.
Supply Chain Attack Detection: Lessons from SolarWinds to MOVEit
Supply chain attacks have become the weapon of choice for sophisticated threat actors. Learn how to detect compromised vendors, monitor third-party risk, and protect your organization before your suppliers become your vulnerability.
AI-Powered Cyberattacks: How Threat Actors Use Machine Learning
Cybercriminals are weaponizing artificial intelligence to launch sophisticated attacks at unprecedented scale. Learn how AI-powered threats work and how threat intelligence can help you defend against them.
Enhancing Zero Trust with Malicious IP and Domain Reputation Analysis
Zero Trust security demands constant verification. Discover how integrating malicious IP and domain reputation checks strengthens your threat intelligence and prevents phishing.
How to Detect Malicious Domains and IPs: A Reputation Guide
A practical guide on detecting malicious domains and IPs using reputation data. Learn to spot phishing threats and secure your applications with real-time threat intelligence.
Proactive Threat Defense: Monitoring Malicious IP and Domain Reputation
Shift from reactive to proactive cybersecurity. Learn how monitoring malicious IP and domain reputation helps identifying threats early and stopping phishing attacks before they succeed.
Why Checking Malicious Domain and IP Reputation is Critical for Threat Prevention
Learn why monitoring domain and IP reputation is essential for cybersecurity. Discover how to detect malicious threats, prevent phishing attacks, and leverage threat intelligence to protect your infrastructure.
Ransomware Detection and Prevention: A Comprehensive Defense Strategy
Learn how to detect ransomware threats before they encrypt your data. Explore proven prevention techniques, early warning signs, and how threat intelligence can protect your organization from costly ransomware attacks.
SSL Certificate Security: Identifying Vulnerabilities and Misconfigurations
SSL certificates are crucial for secure web communications, but misconfigurations and vulnerabilities can expose your users to serious risks. Learn how to identify, assess, and fix SSL certificate security issues before attackers exploit them.
Zero-Day Vulnerabilities: Detection, Response, and Threat Intelligence
Zero-day vulnerabilities pose one of the greatest cybersecurity challenges. Learn how to detect exploitation attempts, respond effectively, and leverage threat intelligence to protect your organization from unknown threats.
Building a Modern SOC with Threat Intelligence: A Practical Guide
Learn how to build an effective Security Operations Center (SOC) powered by threat intelligence. Discover essential tools, processes, and best practices for detecting, analyzing, and responding to cyber threats in real-time.
API Integration for Threat Intelligence: Automate Your Security
Discover how integrating threat intelligence APIs can transform your security infrastructure. Learn best practices for automated threat detection, real-time monitoring, and seamless integration with your existing systems.
Harnessing Public Sources for IP and Domain Maliciousness Detection
Learn how public sources like IP sets and blocklists can enhance your cybersecurity defenses by providing actionable insights into IP and domain maliciousness. Discover how to integrate these resources into WAF solutions like Fortinet and Imperva.
Detecting malicious domain names: a guide to safer browsing
Explore the world of domain name maliciousness and learn how to identify, assess, and protect against harmful domains. Discover tools and techniques to safeguard your online presence.
Understanding IP Maliciousness: A new way to protect your network.
Discover how assessing the potential maliciousness of an IP can safeguard your systems against cyber threats. Learn about the indicators, methods, and tools that help identify malicious IPs and take proactive measures.
Understanding phishing and how to stay protected
Phishing is a growing cybersecurity threat that tricks individuals into providing sensitive information. Learn how to identify phishing attempts and implement strategies to stay safe online.
Expert Threat Intelligence Analysis
Our blog features in-depth analysis from our threat research team. Each article is backed by real data from our analysis of millions of malicious domains, IPs, and URLs across the global threat landscape. Topics include ransomware campaigns, phishing techniques, malware distribution networks, and emerging threat trends. We publish actionable intelligence that security teams can immediately use to improve their defenses.
Practical Security Guidance
Beyond threat analysis, we share practical guidance for security practitioners. Our tutorials cover API integration, SIEM configuration, threat hunting techniques, and building effective threat intelligence programs. Whether you're a SOC analyst, security engineer, or CISO, you'll find content tailored to your role and experience level.
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The threat landscape evolves constantly. Our blog keeps you informed about the latest attack techniques, newly discovered vulnerabilities, and emerging threat actors. Subscribe to our newsletter for weekly digests of the most important developments in cybersecurity.
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