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anohana's profile
Shiro Kawai
Shiro Kawai
Shiro Kawai
@anohana

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Shiro Kawai

@anohana

Schemer, Lisper, Actor / http://github.com/shirok  / http://imdb.me/shirokawai 

Honolulu, HI
blog.practical-scheme.net/shiro
Joined August 2009

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    Shiro Kawai‏ @anohana 3h3 hours ago

    Shiro Kawai Retweeted Pieter Gunst

    これはかなりすごいソーシャルハック。 「怪しいカードの利用がありました。マイアミで使いましたか?」 (いいえ) 「わかりました。このトランザクションはブロックします。本人確認のためメンバー番号を」 (メンバー番号自体は特に秘密でないので伝える) →https://twitter.com/DigitalLawyer/status/1181348689756864513 …

    Shiro Kawai added,

    Pieter Gunst @DigitalLawyer
    Oooof. Was just subjected to the most credible phishing attempt I've experienced to date. Here were the steps: 1) "Hi, this is your bank. There was an attempt to use your card in…
    Show this thread
    2:07 AM - 9 Oct 2019
    • 990 Retweets
    • 862 Likes
    • Kontan_Bigcat public void UQWiMAXをオトクに今期も全力引退中 アリカ もつP@東京両日現地 Yasuo Nakahara 🌸花粉症🌸 名前を追加 なとり
    1 reply 990 retweets 862 likes
      1. New conversation
      2. Shiro Kawai‏ @anohana 3h3 hours ago

        「確認コードをテキストで送るので読み上げて下さい」 (銀行の番号からテキストメッセージが来る。コードを読み上げる) 「本人確認できました。以下の場所でカードを使いましたか?」 (以降、使った覚えのあるトランザクションが読み上げられるのでyesと回答) →

        2 replies 183 retweets 132 likes
        Show this thread
      3. Shiro Kawai‏ @anohana 3h3 hours ago

        「ありがとうございます。念のため暗証番号をブロックします。暗証番号を読み上げてください。」 (は? 何言ってんの?)→切断 実はメンバー番号を伝えた段階で相手はパスワードリセットをかけてて、その確認コードを読み上げさせていた。その時点で相手は口座情報にアクセス可能になっていた。

        1 reply 201 retweets 188 likes
        Show this thread
      4. Shiro Kawai‏ @anohana 3h3 hours ago

        2FAをトリガする時点で、通信相手が確実に対象であることが保証されてないとだめ、と考えれば納得いくんだけど、話術の流れだと自然に信じてしまいそうだ。

        1 reply 125 retweets 138 likes
        Show this thread
      5. Shiro Kawai‏ @anohana 58m58 minutes ago

        かなり端折った訳だったのでわかりづらかったかもしれないけど(1)犯人はおそらくターゲットのメールには既にアクセスできてて(2)パスワードリセットの保護に導入された2FAをこの会話で破ってログインできた(3)だが送金には別に暗証番号(PIN)が必要で、その詐取には失敗した、という流れですね

        1 reply 25 retweets 32 likes
        Show this thread
      6. Shiro Kawai‏ @anohana 56m56 minutes ago

        Shiro Kawai Retweeted Shiro Kawai

        https://twitter.com/anohana/status/1181891174090461185 …

        Shiro Kawai added,

        Shiro Kawai @anohana
        Replying to @torus @cutsea110
        パスワードリセットがかけられたってことは、犯人はターゲットのメールを覗き見できる状態にはあったってことだと思います。銀行側のフローとしては「メンバー番号=ユーザ名からのパスワードリセット要求に対し2FAで確認後に登録メールにパスワードリセットリンクを送付」で問題ない。
        0 replies 11 retweets 11 likes
        Show this thread
      7. End of conversation

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