ランサムウェア攻撃への対応は、想像以上に過酷だ。侵入の検知から被害範囲の特定、システムの遮断、復旧判断に至るまで、企業は短時間で連続的な意思決定を迫られ、実際の現場では対応に数週間を要するケースも珍しくない。LINEヤフーはこうした現実を踏まえ、実環境に近い仮想システムを用いた“実戦型”の対応訓練を実施した。本稿では、その一部始終を追いながら、企業に求められるインシデント対応のリアルをひもとく。
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