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🛡️ '''Antivirus software''' is a category of cybersecurity tool that detects, quarantines, and removes malicious code from computer systems — and in the insurance world, its presence (or absence) on an insured's network is a foundational element of [[Definition:Cyber insurance | cyber insurance]] underwriting. When [[Definition:Underwriter | underwriters]] evaluate a company's application for cyber coverage, the deployment and management of antivirus solutions across endpoints ranks among the most basic controls they assess. Insurers and [[Definition:Managing general agent (MGA) | MGAs]] specializing in cyber lines often require evidence of up-to-date antivirus protection as a minimum condition of coverage, and some policies contain explicit [[Definition:Warranty | warranty]] language that voids coverage if such tools are not maintained throughout the policy period.

⚙️ From an operational standpoint, antivirus software works by scanning files, network traffic, and system behavior against databases of known [[Definition:Malware | malware]] signatures and, increasingly, against behavioral heuristics that flag anomalous activity. In the context of [[Definition:Cyber risk assessment | cyber risk assessment]], insurers evaluate not just whether antivirus is installed but how comprehensively it is deployed — whether it covers all endpoints, whether signature databases are updated automatically, and whether it integrates with broader [[Definition:Endpoint detection and response (EDR) | endpoint detection and response]] platforms. [[Definition:Insurtech | Insurtech]] firms that offer continuous monitoring or "outside-in" scanning as part of the [[Definition:Underwriting | underwriting]] process can detect gaps in antivirus deployment before a policy is bound, feeding this data into [[Definition:Risk scoring | risk scoring]] models that adjust [[Definition:Premium | premiums]] or trigger declinations. In [[Definition:Claims management | claims]] investigations following a [[Definition:Data breach | data breach]], forensic analysts routinely examine whether antivirus tools were active and current at the time of the incident, because lapses can affect coverage determinations.

📊 The significance of antivirus software to the insurance industry extends well beyond individual policy terms. Aggregate data on antivirus adoption rates across insured portfolios helps [[Definition:Actuary | actuaries]] and [[Definition:Catastrophe modeling | catastrophe modelers]] estimate the likelihood of widespread [[Definition:Cyber catastrophe | cyber catastrophe]] events — a scenario where a single vulnerability exploited across millions of unprotected machines could trigger correlated [[Definition:Loss | losses]] across an insurer's book. [[Definition:Reinsurer | Reinsurers]] scrutinize these portfolio-level controls when pricing [[Definition:Reinsurance | reinsurance]] treaties for cyber risk. Regulatory frameworks in multiple jurisdictions, including data protection regimes such as the EU's General Data Protection Regulation and sector-specific rules in the United States, treat the absence of reasonable security measures — antivirus software being a textbook example — as a factor in determining liability and penalties, which in turn influences the [[Definition:Loss development | loss development]] patterns that insurers must reserve against.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Cyber insurance]]
* [[Definition:Endpoint detection and response (EDR)]]
* [[Definition:Malware]]
* [[Definition:Cyber risk assessment]]
* [[Definition:Data breach]]
* [[Definition:Minimum security requirements]]
{{Div col end}}

Definition:Antivirus software - Revision history

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