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(BEC)](https://unit42.paloaltonetworks.com/ja/category/business-email-compromise-ja/ "ビジネスメール詐欺 (BEC)") [ビジネスメール詐欺 (BEC)](https://unit42.paloaltonetworks.com/ja/category/business-email-compromise-ja/) # ナイジェリア発ビジネスメール詐欺の台頭 ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 1未満 分で読めます * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) 著者: * [Unit 42](https://unit42.paloaltonetworks.com/ja/author/unit42/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) 公開日:2018年5月8日 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) カテゴリー * [ビジネスメール詐欺 (BEC)](https://unit42.paloaltonetworks.com/ja/category/business-email-compromise-ja/) * [脅威アクター グループ](https://unit42.paloaltonetworks.com/ja/category/threat-actor-groups-ja/) * 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=ナイジェリア発ビジネスメール詐欺の台頭%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fja%2Funit42-silverterrier-update-increasingly-sophisticated-nigerian-cybercriminals-take-bigger-part-3b-bec-related-losses%2F "Share in Mastodon") ## 概要 Unit 42 は本日、ナイジェリア発のサイバー犯罪の継続的な増加について知らせる最新のホワイト ペーパーの日本語版を刊行しました。3万を超えるマルウェア サンプルを含むデータセットを対象とする高度な分析を3年間にわたって実行することで、当社の顧客への約50万件の攻撃に関係していた300人(グループ)超の存在が明らかになりました。この研究で得られたあらゆるデータを基に、包括的な評価と傾向分析を発表しており、その内容は個々の攻撃者の活動ではなく全体的な脅威に焦点を当てています。 ナイジェリアの攻撃者は全体的に15個の商用マルウェア ツールを利用して、ビジネス メール侵害(BEC)スキームを展開していることが観察されています。昨年だけでも、毎月平均1万7,600件の攻撃を行っており、2016年から45％増加したことがわかります。被害はすべての業種に及んでおり、個人ではなく企業を攻撃対象としています。これらの攻撃者は、商用マルウェア ツールを活用して首尾よく収益を上げる方法を学んだようです。[FBI (米連邦捜査局)](https://www.fbi.gov/news/stories/business-e-mail-compromise-on-the-rise)によると、全世界で報告されている損害額は米国ドルで30億ドルを超えています。 本日のホワイト ペーパーでは、ナイジェリアのサイバー犯罪の経緯と採用されている戦略を詳述し、この脅威がそのサイズ、範囲、複雑度、技術的な能力の点で昨年からどのような発展を遂げたかについて、独自の考察を紹介します。さらに、次の点についても詳述します。 ### **ツールと傾向** ナイジェリアの攻撃者はシンプルな商用情報窃取型ツールを好んで利用しているようですが、昨年は、より複雑な遠隔操作ツール(RAT)を使った攻撃にかなりの増加が見られました。このホワイト ペーパーでは、15個の商用マルウェア ツールすべての使用傾向を示すことで、人気がなくなったツールと、来年以降も脅威を振るうと思われる人気のあるツールを区別しています。 ### **アトリビューション分析(要因分析)がよりスケーラブルに** 分析リソースには限りがあるために、従来のアトリビューション分析(要因分析)の取り組みは、小規模なデータセットに対するものに限定されがちでした。しかしながら Unit 42 ではデータセット サイズが肥大化・複雑化しても、小規模なリソースで大規模なアトリビューション分析を可能にする技法を開発しました。実際、これらの技法により SilverTerrierインフラストラクチャの特定とネットワーク防御機器でのプロアクティブな対策が可能になりました。 「[++SilverTerrier: ナイジェリア発ビジネスメール詐欺の台頭++](https://www.paloaltonetworks.jp/resources/unit-42/unit42-silverterrier-rise-of-nigerian-business-email)」をダウンロードして、この脅威の詳細について調べてください。 トップに戻る ### タグ * [419](https://unit42.paloaltonetworks.com/ja/tag/419-ja/ "419") * [Nigeria](https://unit42.paloaltonetworks.com/ja/tag/nigeria-ja/ "Nigeria") * [SilverTerrier](https://unit42.paloaltonetworks.com/ja/tag/silverterrier-ja/ "SilverTerrier") * [Syndicate Orion](https://unit42.paloaltonetworks.com/ja/tag/syndicate-orion-ja/ "Syndicate Orion") [Threat Research Center](https://unit42.paloaltonetworks.com/ja/ "Threat Research") [次ページ:SquirtDanger: 熟練したマルウェア作成者TheBottleが放ったスイス アーミーナイフ マルウェア](https://unit42.paloaltonetworks.com/ja/unit42-squirtdanger-swiss-army-knife-malware-veteran-malware-author-thebottle/ "SquirtDanger: 熟練したマルウェア作成者TheBottleが放ったスイス アーミーナイフ マルウェア") ### 関連記事 * [オペレーションデリラ: Unit 42、国際刑事警察機構(INTERPOL)に協力しナイジェリア系ビジネスメール詐欺アクターを特定](https://unit42.paloaltonetworks.com/ja/operation-delilah-business-email-compromise-actor/ "article - table of contents") * [オペレーションファルコン II: Unit 42、国際刑事警察機構(INTERPOL)に協力 ナイジェリアのビジネスメール詐欺グループを特定](https://unit42.paloaltonetworks.com/ja/operation-falcon-ii-silverterrier-nigerian-bec/ "article - table of contents") * [SilverTerrier: ナイジェリアのビジネスメール詐欺に関するアップデート 2021](https://unit42.paloaltonetworks.com/ja/silverterrier-nigerian-business-email-compromise/ "article - table of contents") ## 関連項目 リソース ![Pictorial representation of a IUAM ClickFix generator. An artistic depiction of a digital workspace featuring an open laptop with a red virus on the screen, indicating malware.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/10/03_Malware_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2025年10月8日 [#### ClickFixファクトリー：IUAM ClickFixジェネレーターの初公開](https://unit42.paloaltonetworks.com/ja/clickfix-generator-first-of-its-kind/) * [Bash](https://unit42.paloaltonetworks.com/ja/tag/bash-ja/ "bash") * [ClickFix](https://unit42.paloaltonetworks.com/ja/tag/clickfix-ja/ "ClickFix") * [Phishing Kit](https://unit42.paloaltonetworks.com/ja/tag/phishing-kit-ja/ "Phishing Kit") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/clickfix-generator-first-of-its-kind/ "ClickFixファクトリー：IUAM ClickFixジェネレーターの初公開") ![Pictorial representation of phishing bait using AI. A luminous cube labeled "AI" centrally placed on a futuristic circuit board landscape with glowing blue lights and connections.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/03_Security-Technology_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2025年8月19日 [#### フィッシング攻撃に見られる旬のエサ:針先に潜む生成AI](https://unit42.paloaltonetworks.com/ja/genai-phishing-bait/) * [GenAI](https://unit42.paloaltonetworks.com/ja/tag/genai-ja/ "GenAI") * [Phishing](https://unit42.paloaltonetworks.com/ja/tag/phishing-ja/ "phishing") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/genai-phishing-bait/ "フィッシング攻撃に見られる旬のエサ:針先に潜む生成AI") ![Pictorial representation of social engineering. Digital illustration of four human profiles connected by glowing neural network lines against a dark background, symbolizing connectivity and technology.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/07/cover-1920x900-no-blades-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-report-white-1.svg)トレンド レポート](https://unit42.paloaltonetworks.com/ja/category/trend-reports-ja/) 2025年7月30日 [#### Unit 42インシデント レスポンス レポート(2025年版): ソーシャル エンジニアリング編](https://unit42.paloaltonetworks.com/ja/2025-unit-42-global-incident-response-report-social-engineering-edition/) * [Agent Serpens](https://unit42.paloaltonetworks.com/ja/tag/agent-serpens-ja/ "Agent Serpens") * [Credential Harvesting](https://unit42.paloaltonetworks.com/ja/tag/credential-harvesting-ja/ "Credential Harvesting") * [Lumma Stealer](https://unit42.paloaltonetworks.com/ja/tag/lumma-stealer-ja/ "Lumma Stealer") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/2025-unit-42-global-incident-response-report-social-engineering-edition/ "Unit 42インシデント レスポンス レポート(2025年版): ソーシャル エンジニアリング編") ![Pictorial representation of the ransomware landscape. Digital artwork of a disintegrating U.S. dollar bill with pixelated effects on a cyber-inspired background.](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/04/05_Ransomware_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-report-white-1.svg)トレンド レポート](https://unit42.paloaltonetworks.com/ja/category/trend-reports-ja/) 2025年5月22日 [#### 恐喝とランサムウェアの動向 2025年1月～3月](https://unit42.paloaltonetworks.com/ja/2025-ransomware-extortion-trends/) * [AI](https://unit42.paloaltonetworks.com/ja/tag/ai-ja/ "AI") * [Akira ransomware](https://unit42.paloaltonetworks.com/ja/tag/akira-ransomware-ja/ "Akira ransomware") * [BianLian](https://unit42.paloaltonetworks.com/ja/tag/bianlian-ja/ "BianLian") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/2025-ransomware-extortion-trends/ "恐喝とランサムウェアの動向 2025年1月～3月") ![A stylized digital illustration depicting an open laptop with a glowing envelope icon on the screen, indicating an email interface. The laptop is accompanied by a smartphone and a closed tablet, all rendered in a similar design with a metallic red finish. The background is dark with a subtle, wave-like pattern that enhances the techno-futuristic ambiance of the scene.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/01_Business_email_compromise_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2023年3月5日 [#### 2022年の最終週にLokiBotアクティビティが急増](https://unit42.paloaltonetworks.com/ja/lokibot-spike-analysis/) * [Information stealer](https://unit42.paloaltonetworks.com/ja/tag/information-stealer-ja/ "information stealer") * [LokiBot](https://unit42.paloaltonetworks.com/ja/tag/lokibot-ja/ "LokiBot") * [Machine Learning](https://unit42.paloaltonetworks.com/ja/tag/machine-learning-ja/ "Machine Learning") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/lokibot-spike-analysis/ "2022年の最終週にLokiBotアクティビティが急増") ![Three-dimensional render of a red at-symbol suspended by a fishhook over a reflective graphite-colored tiled surface, with abstract patterns and shapes creating a digital landscape. It suggests themes of phishing and business email compromise.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/03_Business_email_compromise_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2022年5月25日 [#### オペレーションデリラ: Unit 42、国際刑事警察機構(INTERPOL)に協力しナイジェリア系ビジネスメール詐欺アクターを特定](https://unit42.paloaltonetworks.com/ja/operation-delilah-business-email-compromise-actor/) * [Nigeria](https://unit42.paloaltonetworks.com/ja/tag/nigeria-ja/ "Nigeria") * [SilverTerrier](https://unit42.paloaltonetworks.com/ja/tag/silverterrier-ja/ "SilverTerrier") * [Syndicate Orion](https://unit42.paloaltonetworks.com/ja/tag/syndicate-orion-ja/ "Syndicate Orion") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/operation-delilah-business-email-compromise-actor/ "オペレーションデリラ: Unit 42、国際刑事警察機構(INTERPOL)に協力しナイジェリア系ビジネスメール詐欺アクターを特定") ![Laptop with a digital screen overlay showing multiple open email windows and fluctuating graph lines, symbolizing active online communication and data analysis.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/04_Business_email_compromise_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2022年1月20日 [#### オペレーションファルコン II: Unit 42、国際刑事警察機構(INTERPOL)に協力 ナイジェリアのビジネスメール詐欺グループを特定](https://unit42.paloaltonetworks.com/ja/operation-falcon-ii-silverterrier-nigerian-bec/) * [Nigeria](https://unit42.paloaltonetworks.com/ja/tag/nigeria-ja/ "Nigeria") * [SilverTerrier](https://unit42.paloaltonetworks.com/ja/tag/silverterrier-ja/ "SilverTerrier") * [Syndicate Orion](https://unit42.paloaltonetworks.com/ja/tag/syndicate-orion-ja/ "Syndicate Orion") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/operation-falcon-ii-silverterrier-nigerian-bec/ "オペレーションファルコン II: Unit 42、国際刑事警察機構(INTERPOL)に協力 ナイジェリアのビジネスメール詐欺グループを特定") ![Glowing red skull and crossbones symbol on a highly detailed, illuminated circuit board background, suggesting a concept of cyber threat or computer virus.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/07_Cybercrime_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2021年10月7日 [#### SilverTerrier: ナイジェリアのビジネスメール詐欺に関するアップデート 2021](https://unit42.paloaltonetworks.com/ja/silverterrier-nigerian-business-email-compromise/) * [SilverTerrier](https://unit42.paloaltonetworks.com/ja/tag/silverterrier-ja/ "SilverTerrier") * [Law Enforcement](https://unit42.paloaltonetworks.com/ja/tag/law-enforcement-ja/ "Law Enforcement") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/silverterrier-nigerian-business-email-compromise/ "SilverTerrier: ナイジェリアのビジネスメール詐欺に関するアップデート 2021") ![A glowing red padlock illuminated by ambient light sits on a wet surface with red particles floating around it, creating a mystical or high-tech atmosphere. The padlock appears sturdy and closed, symbolizing security or protection.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/11_Cybercrime_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2021年10月5日 [#### マルウェアを使わない大規模クレデンシャルハーベスティング（認証情報詐取）](https://unit42.paloaltonetworks.com/ja/credential-harvesting/) * [Credential Harvesting](https://unit42.paloaltonetworks.com/ja/tag/credential-harvesting-ja/ "Credential Harvesting") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/credential-harvesting/ "マルウェアを使わない大規模クレデンシャルハーベスティング（認証情報詐取）") ![A stylized digital illustration depicting an open laptop with a glowing envelope icon on the screen, indicating an email interface. The laptop is accompanied by a smartphone and a closed tablet, all rendered in a similar design with a metallic red finish. The background is dark with a subtle, wave-like pattern that enhances the techno-futuristic ambiance of the scene.](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/01_Business_email_compromise_Category_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)脅威リサーチ](https://unit42.paloaltonetworks.com/ja/category/threat-research-ja/) 2020年5月8日 [#### 脅威攻撃グループSilverTerrierによる新型コロナウイルスをテーマにしたビジネスメール詐欺の手口](https://unit42.paloaltonetworks.com/ja/silverterrier-covid-19-themed-business-email-compromise/) * [COVID](https://unit42.paloaltonetworks.com/ja/tag/covid-ja/ "COVID") * [Syndicate Orion](https://unit42.paloaltonetworks.com/ja/tag/syndicate-orion-ja/ "Syndicate Orion") * [SilverTerrier](https://unit42.paloaltonetworks.com/ja/tag/silverterrier-ja/ "SilverTerrier") [今すぐ読む ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ja/silverterrier-covid-19-themed-business-email-compromise/ "脅威攻撃グループSilverTerrierによる新型コロナウイルスをテーマにしたビジネスメール詐欺の手口") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/04/Unit-42_get-updates-banner.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Unit 42 からの最新情報を取得 ## 進化する脅威の状況を常に先取り メール アドレス 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