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攻撃者の手口と対応

日経NET WORK
副編集長
北郷達郎
2013年に目立ったリスト攻撃
報告された不正アク
セスの事例がかなり
多く、毎日のように
見受けられた
とても多かったのは
パスワードリスト攻
撃
攻撃内容は微妙に違う
 同じ時期の攻撃でも件数やアクセス数が異なる
なぜパスワードを使い回すのか
 覚えられない
 利用サイトが多すぎ
2013年に急増したインターネットバンキング
の不正送金
被害件数
250
194

200

150

150

130

111
100
50

70
23

39
7

14

28

0
1月

2月

3月

4月

5月

6月

7月

8月

9月

10月のデータは15日まで、被害総額はこの時点で約7億6000万円
フィッシングメールの実例

yahoo.co.jpから送っている

「http://anhaixiu.com/js/」
へのリンクになっている
「標的型攻撃じゃないから関係無い」と
思ってませんか?
 手口の基本は一緒
 特定企業を狙った場合は、もっと狡猾
標的型攻撃の典型的手順
 SNSなどから基
本情報を入手
 マルウエアの感
染させ方は、標
的型攻撃でも大
差がない
 一度入ったら静
かに潜行して感
染を広げる
管理者と一般社員の意識差
Webサイト管理者
11.3
個人と企業で分ける
18

個人と企業で同じ
意識してない

9.7

61

利用してない、分から
ない
管理者と一般社員の意識差
ネットユーザー

個人と企業で分ける
34.3

38.2

個人と企業で同じ
意識してない

23

4.4

利用してない、分から
ない
製造業はちょっと隙がある
顧客

端末総数

感染数

攻撃イベントの数

製造業A

4万

2500

20

製造業B

2万5000

200

1200

製造業C

3万5000

350

1200

製造業D

3万

1800

100

製造業E

1万2000

5

600

製造業F

1万2000

500

1000

製造業G

5000

15

30
金融業はホントにお堅い
顧客

端末総数

感染数

攻撃イベント数

金融業A

2万

1

3

金融業B

7500

1

12

金融業C

3000

3

2

金融業D

1000

0

1

金融業E

100

0

2

金融業F

400

0

4
サーバーのログインエラーで発覚
ログファイルから原因を究明
今回の攻撃の概要
ゼロデイ攻撃でマルウエアに感染
こんなことされたら防ぎようがない…
まとめ
 特定の企業ではなく、個人への攻撃も対岸の火事ではない
 利用者の意識改革は有効。特にメールにマルウエアが仕込まれて
いる場合は、教育である程度避けられる
 逆にゼロデイ攻撃は避けようがない。ただ多くの場合、セキュリ
ティパッチの適用を怠ったために残された脆弱性を突いた攻撃で
あり、OSのアップデートはこまめに実施したい
 ネットワーク使用状況のこまめな監視で、攻撃の前兆現象は発見
できる場合がある

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最新インシデントに見る攻撃者の手口と対応