【脅威インテリジェンス・VPNセキュリティ】SonicWallファイアウォールへの大規模偵察活動、4日間で8万4千セッション GreyNoiseは2026年2月22日から25日にかけて、SonicWall SonicOSインフラを標的とした84,142件のスキャンセッションを観測した。4,305のユニークIPアドレスから発信され、92%がSSL VPNの有効性を確認する単一のAPIエンドポイントへのプローブであった。これは認証情報攻撃の前段階となる標的リスト構築を目的としている。 特筆すべきは商用プロキシサービス「ByteZero」の悪用である。キャンペーン全体の32%に相当する27,119セッションが4,102のローテーション出口IPを通じて配信され、IP当たり平均6.6セッションとレート制限回避に最適化されていた。同プロキシの顧客管理プラットフォームは2025年12月初旬からオフライン状態にあり、約3ヶ月間、悪用対策なしで運用が継続している。 SonicWall SSL VPNはランサムウェアの主要な初期アクセス経路として知られ、AkiraとFogランサムウェアグループはVPN認証情報侵害から4時間以内、最短55分で暗号化に至る。インターネット上には43万台以上のSonicWallファイアウォールが露出しており、2万5千台以上がクリティカルな脆弱性の影響下にある。管理インターフェースのアクセス制限、SSL VPNへのMFA強制、CVE-2024-53704のパッチ適用が急務である。 greynoise.io/blog/active-rec…

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