{"id":108955,"date":"2019-02-07T12:00:21","date_gmt":"2019-02-07T20:00:21","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=108955"},"modified":"2020-10-01T02:10:37","modified_gmt":"2020-10-01T09:10:37","slug":"threat-brief-understanding-domain-generation-algorithms-dga","status":"publish","type":"post","link":"https:\/\/origin-unit42.paloaltonetworks.com\/ja\/threat-brief-understanding-domain-generation-algorithms-dga\/","title":{"rendered":"\u8105\u5a01\u306b\u95a2\u3059\u308b\u60c5\u5831: \u30c9\u30e1\u30a4\u30f3\u751f\u6210\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0(DGA)\u306b\u3064\u3044\u3066"},"content":{"rendered":"

\u306f\u3058\u3081\u306b<\/h2>\n

\u3053\u306e10\u5e74\u3067\u30de\u30eb\u30a6\u30a7\u30a2\u306b\u65b0\u305f\u306b\u53d6\u308a\u5165\u308c\u3089\u308c\u305f\u30a4\u30ce\u30d9\u30fc\u30b7\u30e7\u30f3\u306e\u3046\u3061\u3001\u6700\u3082\u91cd\u8981\u306a\u3082\u306e\u306e1\u3064\u306b\u3042\u3052\u3089\u308c\u308b\u306e\u304c\u3001\u3044\u308f\u3086\u308b\u300c\u30c9\u30e1\u30a4\u30f3\u751f\u6210\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0 (Domain Generation Algorithm\u3001DGA)\u300d\u3067\u3059\u3002DGA\u306f\u653b\u6483\u5074\u306e\u4f7f\u3046\u81ea\u52d5\u5316\u624b\u6cd5\u306e1\u3064\u3067\u3001\u3053\u308c\u3092\u4f7f\u308f\u308c\u305f\u9632\u5fa1\u5074\u306f\u3001\u9632\u5fa1\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002DGA\u306f\u3053\u308c\u307e\u306710\u5e74\u4ee5\u4e0a\u4f7f\u7528\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u304c\u3001\u9632\u5fa1\u5074\u306b\u3068\u3063\u3066\u306f\u3044\u307e\u3060\u306b\u5bfe\u6297\u304c\u56f0\u96e3\u306a\u5f37\u529b\u306a\u624b\u6cd5\u3067\u3059\u3002\u5e78\u3044\u73fe\u5728\u306fDGA\u306b\u5bfe\u6297\u3059\u308b\u6280\u8853\u304c\u767b\u5834\u3057\u3066\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n

DGA\u306b\u5bfe\u6297\u3059\u308b\u6280\u8853<\/h2>\n

\u30c9\u30e1\u30a4\u30f3\u751f\u6210\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u7279\u5b9a\u5f62\u5f0f\u3067\u751f\u6210\u3059\u308b\u3088\u3046\u8a2d\u8a08\u3055\u308c\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u6307\u3057\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u5074\u3067\u8fc5\u901f\u306b\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u3001DGA\u3092\u958b\u767a\u3057\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u751f\u6210\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u304c\u3044\u308f\u3086\u308b\u300c\u30b3\u30de\u30f3\u30c9&\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb(C2)\u300d\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3001\u3053\u308c\u3089\u306e\u30c9\u30e1\u30a4\u30f3\u304b\u3089\u6307\u793a\u3092\u53d7\u3051\u305f\u30de\u30eb\u30a6\u30a7\u30a2\u304c\u3001\u6307\u793a\u306b\u5f93\u3063\u3066\u60c5\u5831\u3092C2\u306b\u53d7\u3051\u6e21\u3057\u307e\u3059\u3002<\/p>\n

\u653b\u6483\u8005\u306fDGA\u3092\u4f7f\u3063\u3066\u30de\u30eb\u30a6\u30a7\u30a2\u653b\u6483\u306b\u4f7f\u7528\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u6b21\u3005\u5207\u308a\u66ff\u3048\u3066\u3044\u304d\u307e\u3059\u3002\u30c9\u30e1\u30a4\u30f3\u3092\u5207\u308a\u66ff\u3048\u308b\u7406\u7531\u306f\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u304c\u4f7f\u7528\u3059\u308b\u60aa\u610f\u306e\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3084\u30d9\u30f3\u30c0\u304c\u3059\u3070\u3084\u304f\u30d6\u30ed\u30c3\u30af\u3057\u3066\u524a\u9664\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u653b\u6483\u8005\u306f\u3053\u3046\u3057\u305f\u63aa\u7f6e\u306b\u5bfe\u6297\u3059\u308b\u305f\u3081\u306bDGA\u3092\u958b\u767a\u3057\u305f\u306e\u3067\u3059\u3002<\/p>\n

\u4ee5\u524d\u306e\u653b\u6483\u8005\u306f\u60aa\u610f\u306e\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u9759\u7684\u306a\u30ea\u30b9\u30c8\u3068\u3057\u3066\u4fdd\u6301\u3057\u3066\u3044\u305f\u306e\u3067\u3001\u9632\u5fa1\u5074\u304c\u3053\u306e\u30ea\u30b9\u30c8\u3092\u5165\u624b\u3057\u3066\u30d6\u30ed\u30c3\u30af\u30fb\u524a\u9664\u3092\u3059\u308b\u3053\u3068\u3082\u5bb9\u6613\u3067\u3057\u305f\u3002\u653b\u6483\u5074\u304c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u7528\u3057\u3066\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u30b7\u30f3\u30d7\u30eb\u306b\u30c9\u30e1\u30a4\u30f3\u3092\u9759\u7684\u306a\u30ea\u30b9\u30c8\u3068\u3057\u3066\u4fdd\u6301\u3057\u3066\u3044\u305f\u3068\u304d\u3088\u308a\u3082\u9632\u5fa1\u5074\u306f\u4f7f\u7528\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u3092\u628a\u63e1\u30fb\u4e88\u6e2c\u3057\u306b\u304f\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u30de\u30eb\u30a6\u30a7\u30a2\u304c\u4f7f\u7528\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u306e\u30ea\u30b9\u30c8\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u9632\u5fa1\u5074\u304c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u5fa9\u53f7\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u3066\u3001\u305d\u308c\u306f\u96e3\u3057\u304b\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n

\u4eee\u306b\u30c9\u30e1\u30a4\u30f3\u304c\u4e88\u6e2c\u3067\u304d\u3066\u3082\u3001DGA\u3092\u4f7f\u7528\u3057\u305f\u30de\u30eb\u30a6\u30a7\u30a2\u306e\u30b5\u30a4\u30c8\u524a\u9664\u306f\u304b\u3093\u305f\u3093\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u9632\u5fa1\u5074\u306fISP\u3068\u5354\u529b\u3057\u3001\u3053\u308c\u3089\u60aa\u610f\u306e\u3042\u308b\u30c9\u30e1\u30a4\u30f3\u30921\u3064\u305a\u3064\u524a\u9664\u3059\u308b\u624b\u9806\u3092\u8e0f\u307e\u306d\u3070\u306a\u3089\u306a\u3044\u304b\u3089\u3067\u3059\u3002DGA\u306f\u4f55\u767e\u3001\u4f55\u5343\u3082\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u4f7f\u3046\u3088\u3046\u306b\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3057\u3001\u751f\u6210\u3055\u308c\u308b\u30c9\u30e1\u30a4\u30f3\u3082\u3054\u304f\u9650\u3089\u308c\u305f\u671f\u9593\u306e\u307f\u7a3c\u50cd\u3059\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u74b0\u5883\u3067DGA\u95a2\u9023\u30c9\u30e1\u30a4\u30f3\u3092\u30d6\u30ed\u30c3\u30af\u30fb\u524a\u9664\u3059\u308b\u4f5c\u696d\u306f\u3044\u305f\u3061\u3054\u3063\u3053\u306e\u9aa8\u6298\u308a\u640d\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n

DGA\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u7406\u7531\u3068DGA\u306b\u3088\u308b\u5f71\u97ff<\/h2>\n

DGA\u305d\u306e\u3082\u306e\u304c\u76f4\u63a5\u7684\u640d\u5bb3\u3092\u3082\u305f\u3089\u3059\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3060\u3057DGA\u306f\u6700\u65b0\u30de\u30eb\u30a6\u30a7\u30a2\u304c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u88fd\u54c1\u3084\u5bfe\u5fdc\u7b56\u3092\u56de\u907f\u3059\u308b\u91cd\u8981\u8981\u7d20\u3067\u3059\u3002\u5c11\u306a\u304f\u3068\u30822008\u5e74\u304b\u3089\u5b9a\u671f\u7684\u30fb\u7d99\u7d9a\u7684\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u3068\u3044\u3046\u4e8b\u5b9f\u306f\u3001DGA\u306e\u91cd\u8981\u6027\u3068\u6709\u7528\u6027\u3092\u3088\u304f\u8868\u3057\u3066\u3044\u308b\u3068\u3044\u3048\u307e\u3059\u3002DGA\u306f2008\u5e74\u30682009\u5e74\u306eConficker\u653b\u6483\u3067\u3082\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3057\u305f\u3057\u3001\u653b\u6483\u6210\u529f\u306e\u4e00\u3064\u306e\u8981\u56e0\u306b\u3082\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

DGA\u3078\u306e\u5bfe\u7b56<\/h2>\n

DGA\u306b\u3088\u3063\u3066\u30de\u30eb\u30a6\u30a7\u30a2\u653b\u6483\u306f\u3088\u308a\u4fc3\u9032\u3055\u308c\u308b\u306e\u3067\u3001\u30de\u30eb\u30a6\u30a7\u30a2\u304b\u3089\u306e\u9632\u5fa1\u306e\u305f\u3081\u306b\u53d6\u308b\u5bfe\u7b56\u304c\u305d\u306e\u307e\u307eDGA\u3092\u5229\u7528\u3057\u305f\u30de\u30eb\u30a6\u30a7\u30a2\u653b\u6483\u304b\u3089\u306e\u9632\u5fa1\u306b\u3082\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n

    \n
  1. \u4e88\u671f\u305b\u306c\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u3084\u9001\u4fe1\u5143\u4e0d\u660e\u306e\u30e1\u30fc\u30eb\u306e\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306f\u958b\u304b\u306a\u3044\u3002<\/li>\n
  2. \u6dfb\u4ed8\u3055\u308c\u305f\u6587\u66f8\u306e\u30de\u30af\u30ed\u3092\u6709\u52b9\u306b\u3059\u308b\u306e\u306f\u3001\u9001\u4fe1\u8005\u3068IT\u90e8\u9580\u306b\u6709\u52b9\u5316\u3057\u3066\u3082\u5b89\u5168\u3067\u3042\u308b\u3068\u3044\u3046\u78ba\u8a8d\u3092\u3068\u308c\u305f\u5834\u5408\u306e\u307f\u306b\u3059\u308b\u3002<\/li>\n
  3. \u30de\u30eb\u30a6\u30a7\u30a2\u653b\u6483\u304b\u3089\u306e\u9632\u5fa1\u306b\u5f79\u7acb\u3064\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3092\u5b9f\u884c\u3059\u308b\u3002<\/li>\n<\/ol>\n

    \u3053\u306e\u307b\u304b\u3001\u3068\u304f\u306b\u4f01\u696d\u3092\u5bfe\u8c61\u3068\u3057\u3066\u3001DGA\u3092\u5229\u7528\u3059\u308b\u653b\u6483\u306b\u76f4\u63a5\u5bfe\u6297\u3067\u304d\u308b\u65b0\u6280\u8853\u3082\u958b\u767a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d9\u30f3\u30c0\u304c\u653b\u6483\u8005\u306b\u3088\u308b\u81ea\u52d5\u5316\u306b\u5bfe\u6297\u3059\u308b\u305f\u3081\u306e\u81ea\u52d5\u5316\u3092\u9032\u3081\u3066\u3044\u307e\u3059\u3002\u6a5f\u68b0\u5b66\u7fd2\u3068\u30d3\u30c3\u30b0\u30c7\u30fc\u30bf\u3092\u6d3b\u7528\u3057\u305f\u65b0\u305f\u306aDGA\u5bfe\u7b56\u6280\u8853\u306b\u3088\u308a\u72ec\u81ea\u306e\u4e88\u6e2c\u6a5f\u80fd\u3092\u81ea\u52d5\u5316\u3057\u3001\u3053\u308c\u306b\u3088\u3063\u3066DGA\u5074\u306e\u81ea\u52d5\u5316\u306b\u5bfe\u6297\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u60aa\u610f\u306e\u3042\u308b\u30b5\u30a4\u30c8\u3092\u4e88\u60f3\u3057\u3001\u30d6\u30ed\u30c3\u30af\u3057\u3001\u524a\u9664\u3059\u308b\u307e\u3067\u3092\u652f\u63f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u304f\u308f\u3048\u3066\u3001\u305d\u3082\u305d\u3082\u305d\u3046\u3057\u305f\u60aa\u610f\u306e\u3042\u308b\u30b5\u30a4\u30c8\u304c\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u3058\u305f\u3044\u3092\u9632\u6b62\u3067\u304d\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u65b0\u6280\u8853\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308b\u3053\u3068\u3067\u3001\u65b0\u305f\u306a\u4fdd\u8b77\u5bfe\u7b56\u3068\u3057\u3066\u5c0e\u5165\u3092\u3054\u691c\u8a0e\u3044\u305f\u3060\u3051\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n

    \u7d50\u8ad6<\/h2>\n

    \u3053\u306e\u300c\u8105\u5a01\u306b\u95a2\u3059\u308b\u60c5\u5831\u300d\u306f\u3001\u304a\u5fd9\u3057\u3044\u304a\u5ba2\u69d8\u304c\u73fe\u5b9f\u306e\u8105\u5a01\u3092\u628a\u63e1\u3057\u3001\u5b9f\u751f\u6d3b\u306e\u306a\u304b\u3067\u3069\u3046\u9632\u5fa1\u3092\u884c\u3063\u3066\u3044\u3051\u3070\u3088\u3044\u304b\u3092\u7406\u89e3\u3059\u308b\u4e00\u52a9\u3068\u3057\u3066\u4f5c\u6210\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

    \u672c\u7a3f\u306f\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9Unit 42\u8105\u5a01\u30ea\u30b5\u30fc\u30c1\u30c1\u30fc\u30e0\u306b\u3088\u3063\u3066\u307e\u3068\u3081\u3089\u308c\u305f\u3082\u306e\u3067\u3059\u3002\u672c\u7a3f\u3092\u304a\u8aad\u307f\u306b\u306a\u3063\u305f\u7686\u69d8\u306f\u3001\u3054\u5bb6\u65cf\u3084\u3054\u53cb\u4eba\u3001\u540c\u50da\u306e\u7686\u3055\u3093\u3068\u672c\u7a3f\u306b\u8a18\u8f09\u3057\u305f\u60c5\u5831\u3092\u5171\u6709\u3057\u3001\u5b89\u5168\u306b\u30c7\u30b8\u30bf\u30eb\u4e16\u754c\u3067\u30d3\u30b8\u30cd\u30b9\u3092\u9032\u3081\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

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