There’s been a 225% rise in monthly cyber threat alerts since 2025.[1] Ransomware and other types of cyberattacks on Policy Administration Systems (PAS) have also become a serious cybersecurity threat to small and regional P&C carriers. Because a PAS sits at the center of underwriting, billing, claims, and policy servicing, even a single breach can freeze core operations, expose sensitive claimant data, and trigger costly regulatory consequences. Sensitive data may be breached.
As carriers modernize and rely more heavily on digital platforms with file uploads, agent portals, and customer self-service, the security posture of the PAS becomes a critical line of defense.
This guide breaks down how ransomware infiltrates insurance systems, why file upload vulnerabilities and macro-enabled document risks are now primary attack vectors, and which PAS security features reduce exposure. From malicious file-extension filtering to AES encryption, session hijacking prevention, and hardened input sanitization, we examine the architectural safeguards that help carriers block modern threats.
What Is Ransomware and Exfiltration?
The goal of a ransomware attack is to get access to the server, encrypt the data and sell back the key to access the data. The attacker needs to gain access to the server. Encrypting the data on the server does not change anything, because the attacker can encrypt the data a second time. But ransomware is not the only type of attack carriers and MGAs should be aware of.
What Is Data Access / Exfiltration?
With data exfiltration, the attacker is trying to get information out of the system. This can be the personally identifiable information (PII) or payment information. During this type of attack, the attacker remains quiet to try and collect information for a long period of time.
What Is Data Access / Exfiltration App Access?
The attacker will act like a normal internal user, and use the web interface to access the data that the user would normally be able to access. The main intention of the attack is to extract PII directly through the interface.
The Anatomy of a PAS Ransomware Attack: Why the Stakes are High
For a property & casualty (P&C) carrier, a ransomware and policy administration attack is not merely a data breach; it is an operational heart attack. Because the Policy Administration System (PAS) serves as the "brain" of the organization, its compromise triggers a cascade of failures across the entire insurance lifecycle.
Disruption: The Domino Effect on Insurance Operations
When ransomware enters a PAS environment, the impact is felt instantly across multiple departments:
Underwriting Paralysis: Real-time quoting and policy issuance grind to a halt, preventing the carrier from writing new business.
Billing & Revenue Freezes: Automated premium collection and renewal billing cycles are disrupted, resulting in immediate cash-flow volatility.
Claims Gridlock: Adjusters lose access to policy limits, coverage details, and claimant history, delaying essential payments to policyholders during their time of need.
Entry Points & Cyber Attack Vectors in the Insurance Workflow
The move toward digital insurance operations has expanded the attack surface. Ransomware no longer arrives via a suspicious email alone; it often exploits the very features designed to make insurance easier for agents and customers.
Unstructured data intake poses vulnerabilities. Every time an agent uploads a loss photo, a claimant submits a medical report, or a policyholder sends a signed form, they are interacting with the server's file system. Without a specialized security architecture, these routine interactions become "open doors" for malicious scripts disguised as standard documents.
For small and regional carriers, cyber threats are compounded by limited IT oversight, often resulting in slower patch management and a lack of redundant, off-site fail-overs. Staying safe requires examining social engineering attacks and policy administration system security.
The Human Firewall: Ways To Prevent Social Engineering Attacks on Staff
The greatest risk to an insurance carrier often lies within its own staff. Social engineering attack—the psychological manipulation of employees—is the primary method used to bypass policy administration system security.
In the high-pressure environment of claims and underwriting, attackers exploit the "culture of helpfulness" inherent in insurance.
Common Social Engineering Tactics in Insurance
The "Urgent" Claim Phishing Tactic: An adjuster receives an email appearing to be from a frustrated policyholder. It contains a link to a "photo of the damage" which, in reality, is a portal designed to bypass session hijacking prevention or to harvest credentials.
Spoofed Agent Portals: Attackers create a login page that looks identical to a carrier’s portal. Once an agent enters their credentials, the attacker gains the keys, rendering your internal session hijacking prevention measures useless.
The "Trusted" PDF: Even with macro-enabled document risks mitigated, attackers may use "low-tech" social engineering to convince an employee to disable security settings to view a "corrupted" but essential legal document.
Your First Line of Defense: Empowering Staff Against Ransomware
To complement the technical features of a system like ISi, carriers must implement:
Phishing Simulations: Regularly test employees with "fake" malicious emails to identify who needs more training.
MFA Everywhere: Multi-factor authentication is the single best defense against compromised credentials.
The "Slow Down" Protocol: Encouraging adjusters and agents to verify the source of unexpected file uploads or link requests before clicking.
Why Ransomware & Other Cyber Attacks Target Policy Administration Systems
A PAS is the operational backbone of an insurance company. It manages quoting, underwriting, policy issuance, billing, endorsements, renewals, cancellations and claims. Because it touches every part of the insurance lifecycle, it also stores some of the most sensitive data an insurer holds.
This makes a PAS a high-value target. If attackers can encrypt or exfiltrate this data, they gain enormous leverage. For smaller carriers without large IT teams, the risk is even greater: limited resources often mean slower patch cycles, fewer monitoring tools and less backup or fail-over capability if systems are compromised.
PAS Features That Prevent Ransomware & Other Cyber Attacks
No modern policy admin system can guarantee that it is ransomware-proof. However, several meaningful safeguards reduce the likelihood of ransomware entering or spreading through the system.
These protections fall into four major categories: file upload controls, encryption, authentication, and input sanitization. Let’s look at each category and at how Internet Solutions for Insurance (ISi) has these safeguards in place.
File Upload Controls: Blocking Malicious Files at the Door
File upload vulnerabilities are very real. One of the most common ransomware entry points is the upload of malicious files disguised as harmless documents. Insurance systems routinely accept uploads from agents, policyholders and claimants—photos, forms, reports and other supporting documents.
It’s important to find out if your PAS has protections to block malicious files. Modotech’s ISi PAS implements strict file-level defenses designed to prevent this attack vector:
Malicious File Extension Filtering
ISi offers malicious file extension filtering. The system maintains a list, which includes file types commonly used to deploy ransomware. These formats are frequently used to execute scripts, launch payloads, or exploit vulnerabilities in office software.
Strict Allowed File Types
ISi also maintains a list, which limits uploads to safe, non-executable formats. By narrowing the acceptable file types, the system reduces the attack surface dramatically.
AES & PGP Encryption: Protecting Data Even If a Breach Occurs
Encryption does not stop ransomware from locking files, but it does protect the confidentiality of the data if attackers gain access.
ISi uses multiple layers of encryption:
AES Encryption for Sensitive Data
AES encryption is available with ISi. The ISiEncrypt module uses AES (Advanced Encryption Standard) with defined keys and salt values to secure:
Social Security numbers
Account numbers
Other sensitive policyholder or claimant data
AES is widely regarded as the industry standard for secure encryption.
PGP Encryption for File Transfers
The system supports PGP encryption and signing for files during transmission. This ensures that:
Files cannot be intercepted or altered
Data remains secure in transit between systems
SHA256 Hashing
Hashing is used for data verification and integrity checks. While not a ransomware defense on its own, it helps detect tampering.
Authentication & Access Control: Preventing Unauthorized Entry
Ransomware often spreads through compromised credentials. ISi includes several mechanisms to reduce this risk.
Single Sign-On (SSO)
The system supports centralized authentication and reduces the number of passwords users must manage. This lowers the likelihood of weak or reused passwords.
Password Complexity Enforcement
The system checks for:
Common passwords
Passwords matching the username
Weak or predictable patterns
This helps prevent brute-force or credential-stuffing attacks.
Session Integrity Firewall, Session Hijacking Prevention
ISi offers session hijacking prevention tools. The file app_SessionIntegrityFirewall.cfm monitors for:
Session hijacking
Token mismatches
Suspicious credential behavior
If anomalies are detected, the system blocks access and logs the event.
Input Sanitization: Preventing Exploits Through File Names and Paths
Attackers often attempt to exploit systems by embedding malicious characters in file names or paths. ISi includes several layers of sanitization:
Removes unsafe characters
Cleans filenames
Directory traversal attempts are blocked
Special characters that could trigger script execution are removed
These protections help prevent attackers from using file names to execute commands or navigate the server’s directory structure.
Insurance Software Cybersecurity for Carriers
The security features embedded in ISi’s architecture demonstrate a thoughtful approach to mitigating ransomware risks. The system:
Blocks malicious files before they can execute
Encrypts sensitive data at rest and in transit
Enforces strong authentication
Sanitizes inputs to prevent exploit attempts
These are meaningful, practical defenses that reduce exposure.
What a PAS Cannot Protect You From
No PAS can guarantee immunity. Even the most secure PAS cannot defend against:
Unpatched operating systems
Outdated servers
Misconfigured firewalls
Lack of off-site backups
Phishing attacks targeting employees
Compromised third-party integrations
Ransomware resilience requires a layered approach. A secure PAS is one layer—but not the only one.
Conclusion: ISi Is a Strong Foundation in Cyber Defense
Ransomware has become one of the most disruptive threats to modern insurance operations, and policy administration systems sit directly in the crosshairs. Insurance software cybersecurity is built into systems like ISi—malicious file-extension filtering, AES encryption, session hijacking prevention, and hardened input sanitization—provide meaningful protection against today’s most common attack vectors. But no single platform can defend a carrier on its own.
True ransomware resilience requires a layered strategy: secure PAS architecture, disciplined patching, employee training, strong authentication, and a well-defined incident response plan. When these elements work together, carriers can reduce risk, maintain operational continuity, and protect the policyholder data entrusted to them.
If you’re evaluating how to strengthen your PAS security posture, explore how Modotech supports secure PAS modernization and see these protections in action with a live demo.
Sources
Dataminr. 2026 Cyber Threat Landscape Report.