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ランサムウェアによる暗号化被害から身を守る

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次の被害者にならないでください

ランサムウェア対策の世界的なリーダーによるランサムウェアの洞察と防御に関するアドバイス。

データを暗号化したり、身代金と引き換えに暗号化データを保持したりするランサムウェア攻撃は、ここ何年もニュースの見出しに取り上げられています。身代金を要求される被害者は、世界中の企業から病院や民間人までと多岐にわたります。

Know Your Enemy

48% of data breaches involved ransomware. Don't join the club.

2026 State of Ransomware Report

2,158 organizations hit by ransomware in the past year share costs and root causes.

Active Adversary Report 2026

661 IR and MDR cases across 70 countries reveal how today's attackers operate.

2026 State of Identity Security Report

5,000 IT and cybersecurity leaders across 17 countries reveal the rising cost and frequency of identity attacks.

Think You Know Ransomware?

This gripping documentary takes you inside the multi-billion-dollar ransomware economy: the attackers, the victims, and the defenders racing to stop the next breach.

Watch All Episodes

Train Your Organization to Stop Ransomware

Our free anti-ransomware toolkit gives IT managers ready-to-use resources that teach teams how to prevent ransomware attacks. The kit includes:

Sample ransomware tabletop exercise
Incident response planning guide
Endpoint protection best practices to stop ransomware
Best practices for securing your network from ransomware
And more

Ransomware Best Practices

Follow these top tips to minimize your risk of attack:

Use multi-factor authentication (MFA)
Use complex passwords
Limit access rights; give user accounts and administrators only the access rights they need and nothing more
Make regular backups, and keep them offsite and offline where attackers can’t find them
Patch early and patch often. Ransomware actors exploit unpatched vulnerabilities to compromise environments — and frontier AI is accelerating vulnerability discovery.
Lock down your RDP. Turn off RDP if you don’t need it, and use rate limiting and MFA if you do.
Ensure tamper protection is enabled – Ryuk and other ransomware strains attempt to disable your endpoint protection

Deploy World-Class Protection

Today’s ransomware attacks often combine multiple advanced techniques even real-time hacking via subscriptions to ransomware-as-a-service. To minimize your risk of falling victim you need advanced protection that monitors and secures the whole attack chain.

Sophos Managed Detection and Response

24/7 expert-led threat hunting, detection, and response. Sophos MDR neutralizes ransomware and other advanced threats on your behalf — including the 88% of attacks that strike outside business hours.

Sophos Endpoint, EDR + XDR

The foundation of your ransomware defense system. Sophos Endpoint and EDR combine AI, CryptoGuard anti-ransomware, Adaptive Attack Protection, and 60+ built-in exploit mitigations to shut down attacks before they impact your business. Sophos XDR unifies telemetry from all control points (servers, firewalls, cloud, email, identity, etc.) into a single management console.

Sophos Firewall

Stop ransomware at the perimeter and contain it if it gets in. Sophos Firewall uses deep learning and AI to detect and block ransomware at the gateway, with lateral movement prevention, Zero Trust Network Access, and active threat response that shares signals with Sophos Endpoint to shut down attacks as they unfold.

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