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padding: 12px 0; text-align: center; color: white !important; font-weight: bold; border-radius: 8px; box-shadow: 1px 1px 0 0 rgba(255,255,255,.3) inset, 3px 3px 8px 0 rgba(0,0,0,0.4); } .small_note { font-size: large; grid-area: 2 / 3 / 3 / 4; } .price_note { grid-area: 1/3/2/4; font-size:68px; } @media screen and (max-width: 450px) { .donate_button{ grid-template-columns: 1fr 80px auto 1fr; } .price_note{font-size:60px;} } .donate_icon { grid-area: 1/1/-1/3; width: 85%; max-width: 100px; margin: auto; max-height: 100px; } .fa-secondary{fill:#fdd835;} .payment-marks { display: flex; width: 400px; max-width: 100%; margin: auto; justify-content: right; } .payment-marks img{ height: 30px; margin-right: 6px; border: none; width: auto; } </style> <svg display="none"> <defs> <symbol viewBox="0 0 576 512" id="pg-bank">  <path d="M560 224h-29.51a159.88 159.88 0 0 0-37.38-52.46L512 96h-32c-29.4 0-55.39 13.5-73 34.32-7.57-1.1-15.12-2.32-23-2.32H256c-94.82 0-160 78.88-160 160a159.75 159.75 0 0 0 64 128v80a16 16 0 0 0 16 16h64a16 16 0 0 0 16-16v-48h128v48a16 16 0 0 0 16 16h64a16 16 0 0 0 16-16v-80.72A160.37 160.37 0 0 0 511.28 384H560a16 16 0 0 0 16-16V240a16 16 0 0 0-16-16zm-128 64a16 16 0 1 1 16-16 16 16 0 0 1-16 16z" class="fa-secondary"/><path d="M51.26 255.52a24 24 0 0 1-18.74-28.3C34.74 215.82 45.4 208 57 208h1a6 6 0 0 0 6-6v-20a6 6 0 0 0-6-6C29.5 176 4.1 196.4.47 224.62a54.64 54.64 0 0 0-.47 7.23A56.08 56.08 0 0 0 56 288h40a155.05 155.05 0 0 1 3.37-32H56a23.63 23.63 0 0 1-4.74-.48zM432 256a16 16 0 1 0 16 16 16 16 0 0 0-16-16zM306.5 0a96 96 0 0 0-88.81 132.51A162.64 162.64 0 0 1 256 128h128a104.31 104.31 0 0 1 12.71.88A96.06 96.06 0 0 0 306.5 0z" class="fa-primary"/> </symbol> </defs> </svg> <div id="donate_title_close" class="donate_title" style="display:none;"> ▼サーバー運営を助ける支援をお願いします </div> <div id="donate_title_open" class="donate_title"> ▼サーバー運営を助ける支援をお願いします </div> <div id="donate_large"> <div style="text-align: center; display: grid; grid-template-columns: 30px 20px auto 20px auto; grid-template-rows: auto auto; width: 400px; max-width: 100%; margin: auto;"> <div class="amount_options" id="onetime"> <a id="donate_link" onclick="localStorage.setItem('donateClickDate', new Date().toString());dataLayer.push({'event': 'donateLinkClicked'});" href="https://donate.stripe.com/5kA5msbys6u42Gs14k" target="_blank" class="button-exp-style donate_button"> <svg class="donate_icon"><use xlink:href="#pg-bank"></svg> <span class="price_note">900円</span><span class="small_note">(うち手数料33円)</span></a> <input type="range" min="1" max="7" value="3" id="donation_slider"> <script> const priceData = [ { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">300円</span><span class="small_note">(うち手数料11円)</span>`, url: "https://donate.stripe.com/fZe4io1XSbOo0yk9AB" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">600円</span><span class="small_note">(うち手数料22円)</span>`, url: "https://donate.stripe.com/00g4io6e8bOo1CoeV9" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">900円</span><span class="small_note">(うち手数料33円)</span>`, url: "https://donate.stripe.com/5kA5msbys6u42Gs14k" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">1500円</span><span class="small_note">(うち手数料54円)</span>`, url: "https://donate.stripe.com/14k4io7ic6u46WI147" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">3000円</span><span class="small_note">(うち手数料108円)</span>`, url: "https://donate.stripe.com/28o6qweKE9GgftedQV" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">5000円</span><span class="small_note">(うち手数料180円)</span>`, url: "https://donate.stripe.com/bIY4ioauo7y8ch24gm" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">1万円</span><span class="small_note">(うち手数料360円)</span>`, url: "https://donate.stripe.com/cN25ms1XSf0AfteeV1" }, { text: `<svg class="donate_icon"><use xlink:href="#pg-bank"></svg><span class="price_note">テスト</span><span class="small_note">(うち手数料XX円)</span>`, url: "https://donate.stripe.com/test_7sIaIy7n5arT90c7st" } ]; const slider = document.getElementById("donation_slider"); const button = document.getElementById("donate_link"); slider.addEventListener("input", e=>{ button.innerHTML = priceData[e.target.value - 1].text; button.href = priceData[e.target.value - 1].url + window.location.search; }); button.href = button.href + window.location.search; </script> </div> </div> <div class="payment-marks"> <img src="https://i.gzn.jp/img/gsc/payment/visa.png" border="0"> <img src="https://i.gzn.jp/img/gsc/payment/master.png" border="0"> <img src="https://i.gzn.jp/img/gsc/payment/amex.png" border="0"> <img src="https://i.gzn.jp/img/gsc/payment/apple-pay.svg" border="0"> <img src="https://i.gzn.jp/img/gsc/payment/g-pay.png" border="0"> </div> <p> 私たちは過去最高の大ヒットを記録しているのと裏腹に価格高騰などの影響でサーバー運営が非常に苦しい状態です。打てる手は全て打ちましたが、それでもまだ危機的状況にあります。なので、GIGAZINEの物理的なサーバーたちを、たった1円でも良いので読者の皆さまに支援してもらえればとっても助かります！今すぐ1回払いの寄付は上のボタンから、毎月寄付は<b><a href="https://gigazine.net/club/" target="_blank">こちらのリンク先から！</a></b><br> <br> ・<b><a href="https://gigazine.net/sponsor/20250101-thank-you/" target="_blank">これまでGIGAZINEを支援してくれたメンバーのリスト</a></b> </p> </div> </div> <script> (async ()=>{ let adblock = false; const url = "https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"; try { const response = await fetch(url); } catch (error) { adblock = true; } const showDonateWrapper = ()=>{ donationWrapper.style.display = "block"; } const donationWrapper = document.getElementById('donation_wrapper'); if(/https:\/\/gigazine.net\/news\/about\/*/.test(location.href)){showDonateWrapper();} else if(!window.localStorage.getItem("landing_flag_donate")){ 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<style> .p-category{ position: absolute; right: 2px; } </style> <h1 class="title">iOSアプリで初めてテキスト画像認識で機密情報を読み取るマルウェアが発見される</h1>  <p class="preface"></p><a href="https://pixabay.com/photos/smartphone-cellphone-touchscreen-1894723/" target="_blank"><img src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/00_m.jpg" border="0" alt="" class="lzsmall img-standard-size"></a><p class="preface"> <br /> セキュリティ企業のKasperskyが、AndroidアプリとiOSアプリでテキスト画像認識機能を持つマルウェアを発見したと報告しています。「<b>SparkCat</b>」と呼ばれるこのマルウェアはユーザーが撮影したスクリーンショットの内容を読み取る機能を持っており、特に仮想通貨ウォレットの<b><a href="https://www.ledger.com/ja/academy/%E7%A7%98%E5%AF%86%E3%81%AE%E3%83%AA%E3%82%AB%E3%83%90%E3%83%AA%E3%83%BC%E3%83%95%E3%83%AC%E3%83%BC%E3%82%BA%E3%81%A8%E3%81%AF" target="_blank">リカバリーフレーズ</a></b>を狙っていたとのことです。<br /> <br /> <b>SparkCat crypto stealer in Google Play and App Store | Securelist</b><br /> <b><a href="https://securelist.com/sparkcat-stealer-in-app-store-and-google-play/115385/" target="_blank">https://securelist.com/sparkcat-stealer-in-app-store-and-google-play/115385/</a></b><br /> </p><a href="https://securelist.com/sparkcat-stealer-in-app-store-and-google-play/115385/" target="_blank"><img src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/snap8315.png" border="0" alt="" class="lzsmall"></a><p class="preface"> <br /> <b>Malware With Screen Reading Code Found in iOS Apps for the First Time - MacRumors</b><br /> <b><a href="https://www.macrumors.com/2025/02/05/ocr-malware-app-store/" target="_blank">https://www.macrumors.com/2025/02/05/ocr-malware-app-store/</a></b><br /> <br /> SparkCatは正規のアプリストアを通じて配布されており、サポートチャットでの画像添付など、一見すると正当な機能を装って画像へのアクセス許可を要求します。Kasperskyによると、SparkCatは2024年3月頃から活動を開始しており、ComeCome、WeTink、AnyGPTなどのApp Store上のアプリに感染が確認されています。これらの感染が開発者の意図的な行為なのか、サプライチェーン攻撃の結果なのかは明らかになっていません。<br />  </p> <div id='Google_IL' style='padding-top: 8px; padding-bottom: 8px;'> <div id='div-gpt-ad-1546928741451-0'><script data-cfasync="false"> googletag.cmd.push(function() {googletag.display('div-gpt-ad-1546928741451-0');}); </script></div> </div><p class="preface"><br /> 感染したアプリは、ダウンロード後にユーザーの写真へのアクセス許可を要求し、許可が与えられるとOCR機能を使用して関連するテキストを含む画像を探索します。このマルウェアは主にヨーロッパとアジアのiOSユーザーを標的にしていたとされています。<br /> <br /> <br /> Kasperskyによると、SparkCatはJavaで書かれた「Spark」というSDKを基盤としており、初期化時にGitLabのURLからJSON構成ファイルをダウンロードするとのこと。このJSON構成ファイルは<b><a href="https://ja.wikipedia.org/wiki/Base64" target="_blank">base64</a></b>でエコードされ、<b><a href="https://e-words.jp/w/AES128.html" target="_blank">AES128</a></b>の<b><a href="https://zenn.dev/kunosu/books/12fa489ef0821d803c4d/viewer/cbc" target="_blank">CBCモード</a></b>で暗号化されており、設定取得に失敗した場合はデフォルト設定が使用される仕組みになっています。<br /> </p><a href="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/02.png" target="_blank"><img src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/02_m.png" border="0" alt="" class="lzsmall"></a><p class="preface"> <br /> 通信面では、HTTPサーバーとの通信にPOSTリクエストを使用し、<b><a href="https://www.progress.com/jp/blogs/use-aes-256-encryption-secure-data" target="_blank">AES-256</a></b>のCBCモードでデータを暗号化します。また、「rust」サーバーとの通信では、<b><a href="https://ja.wikipedia.org/wiki/Zstandard" target="_blank">ZSTD</a></b>による圧縮と<b><a href="https://engineering.linecorp.com/ja/blog/AES-GCM-SIV-optimization" target="_blank">AES-GCM-SIV</a></b>による暗号化を組み合わせた独自のプロトコルを実装しているとのこと。<br /> <br /> コードは一般的なモバイルアプリとしては珍しく<b><a href="https://ja.wikipedia.org/wiki/Rust_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E)" target="_blank">Rust</a></b>で書かれていることから、背後に高度な技術力があるとKasperskyは指摘しています。また、コードの分析から、開発者は中国語に精通していることが示唆されているほか、C2サーバーからのエラーメッセージも中国語で返されており、中国と関連のあるサイバー犯罪グループが関与している可能性があります。ただし、Kasperskyは「特定のサイバー犯罪グループとの明確な関連付けを行うには十分なデータがない」と述べています。<br /> <br /> マルウェアの核となる機能はGoogleのML Kitライブラリを利用した<b><a href="https://developers.google.com/ml-kit/vision/text-recognition/v2?hl=ja" target="_blank">テキスト認識</a></b>で、システムの言語に応じてラテン文字や韓国語、中国語、日本語の文字を認識できる異なるOCR(光学文字認識)モデルを読み込みます。画像処理には3つの方式があり、キーワードによる処理、単語の長さによる処理、ローカライズされた辞書による処理を組み合わせているとのこと。<br /> </p><a href="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/04.png" target="_blank"><img src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/04_m.png" border="0" alt="" class="lzsmall"></a><p class="preface"> <br /> 以下は、アラブ首長国連邦とインドネシアで使われているフードデリバリーアプリで、Kasperskyが調査を開始した時点ではGoogle Playでのダウンロード回数が1万回を超えていたとのこと。<br /> </p><a href="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/06.png" target="_blank"><img src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/06_m.png" border="0" alt="" class="lzsmall"></a><p class="preface"> <br /> このフードデリバリーアプリはApp Storeでも配信されていましたが、このiOS版もやはりSparkCatに感染していたとのこと。さらなる調査の結果、他にも複数のアプリがSparkCatに感染した状態で配布されていたことが判明しました。Kasperskyは、OCR機能を持つマルウェアがApp Storeで発見されたのは今回が初めてだと述べています。<br /> </p><a href="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/07.png" target="_blank"><img data-src="https://i.gzn.jp/img/2025/02/06/sparkcat-crypto-stealer-android-ios/07_m.png" border="0" alt="" class="lazyload"></a><p class="preface"> <br /> 仮想通貨ウォレットのリカバリーフレーズを特定して盗むという明確な目的を持つ悪意のあるアプリがApp Storeで配布されていたことは、攻撃者側の技術的な洗練度が増しているだけではなく、App Storeの審査プロセスとiOSのセキュリティが完璧ではないことも示しているとKasperskyは述べています。<br /> <br /> Kasperskyは「感染したアプリのいずれかがデバイスにインストールされている場合はそれを削除し、修正がリリースされるまで再インストールしないでください」「仮想通貨ウォレットのリカバリーフレーズなどの機密情報を含むスクリーンショットをギャラリーに保存しないでください。パスワードや機密情報はパスワードマネージャーなどを使って管理してください」と呼びかけています。</p>  <div style="text-align: center; margin: 10px auto 0px;"><div id="URLClip" style="width:300px; height:40px; border: 2px solid #bbb; border-radius: 3px; background: white; padding: 8px 0; text-align: center; position: relative; cursor: pointer; color: #222; font-size: 14px; font-weight: 700; display: inline-block; vertical-align: middle;">この記事のタイトルとURLをコピーする</div></div> </div>  <div 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