閉める
閉める
明日に向けたネットワーク
明日に向けたネットワーク
サポートするアプリケーションとユーザー向けに設計された、より高速で、より安全で、回復力のあるネットワークへの道を計画します。
          Netskopeを体験しませんか?
          Get Hands-on With the Netskope Platform
          Here's your chance to experience the Netskope One single-cloud platform first-hand. Sign up for self-paced, hands-on labs, join us for monthly live product demos, take a free test drive of Netskope Private Access, or join us for a live, instructor-led workshops.
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            Netskope、2024年ガートナー、シングルベンダーSASEのマジック・クアドラントでリーダーの1社の位置付けと評価された理由をご確認ください。
              ダミーのためのジェネレーティブAIの保護
              ダミーのためのジェネレーティブAIの保護
              Learn how your organization can balance the innovative potential of generative AI with robust data security practices.
                Modern data loss prevention (DLP) for Dummies eBook
                最新の情報漏えい対策(DLP)for Dummies
                Get tips and tricks for transitioning to a cloud-delivered DLP.
                  SASEダミーのための最新のSD-WAN ブック
                  Modern SD-WAN for SASE Dummies
                  遊ぶのをやめる ネットワークアーキテクチャに追いつく
                    リスクがどこにあるかを理解する
                    Advanced Analytics transforms the way security operations teams apply data-driven insights to implement better policies. With Advanced Analytics, you can identify trends, zero in on areas of concern and use the data to take action.
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        Netskope One Private Access is the only solution that allows you to retire your VPN for good.
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                            Netskope GovCloud
                            NetskopeがFedRAMPの高認証を達成
                            政府機関の変革を加速するには、Netskope GovCloud を選択してください。
                              Let's Do Great Things Together
                              Netskopeのパートナー中心の市場開拓戦略により、パートナーは企業のセキュリティを変革しながら、成長と収益性を最大化できます。
                                Netskopeソリューション
                                Netskope Cloud Exchange
                                Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.
                                  Netskopeテクニカルサポート
                                  Netskopeテクニカルサポート
                                  クラウドセキュリティ、ネットワーキング、仮想化、コンテンツ配信、ソフトウェア開発など、多様なバックグラウンドを持つ全世界にいる有資格のサポートエンジニアが、タイムリーで質の高い技術支援を行っています。
                                    Netskopeの動画
                                    Netskopeトレーニング
                                    Netskopeのトレーニングは、クラウドセキュリティのエキスパートになるためのステップアップに活用できます。Netskopeは、お客様のデジタルトランスフォーメーションの取り組みにおける安全確保、そしてクラウド、Web、プライベートアプリケーションを最大限に活用するためのお手伝いをいたします。

                                      CloudSquirrel Malware Squirrels Away Sensitive User Data Using Popular Cloud Apps

                                      Jul 15 2016
                                      Tags
                                      Cloud Best Practices
                                      Cloud Malware
                                      Cloud Security
                                      CloudSquirrel
                                      Netskope Threat Research Labs
                                      Tools and Tips
                                      Vulnerability Advisory

                                      Netskope has discovered a malware campaign that takes advantage of multiple cloud apps throughout the kill chain. The campaign, which we have dubbed “CloudSquirrel,” has been in operation since June 2016 and has the intention of stealing and exfiltrating user data within the Outlook address book and, more importantly, usernames and corresponding passwords for email accounts configured in any of the email clients.

                                      Likely originating in Brazil (based on names and parameters), CloudSquirrel is written in Java and is being distributed using ServInt’s Jelastic platform-as-a-service(PaaS). Jelastic redirects to the CloudApp collaboration platform which, in turn, uses Amazon AWS for its backend cloud services. This cloud malware actively uses Dropbox for its command and control communications.

                                      We have observed the CloudSquirrel attack arriving via an email phishing attack. This attack email attempts to trick its victim into opening it with a “tax invoice” or other important-sounding link. Once open, CloudSquirrel infects users by downloading additional malicious encrypted payloads via a JAR file. Those can include information and password stealers. Once the malware establishes a connection with its command and control hosted in Dropbox, it’s commands masquerade as plain text files with fake extensions like .mp4, .wmv, .png, .dat, and .wma.

                                      At this point, CloudSquirrel receives instructions to find and exfiltrate information both about users’ machines as well as account data such as usernames and passwords configured in native email clients.

                                      Here is the redirect path that CloudSquirrel uses.

                                      cloudsquirrel-redirect-path

                                      Summary Observations

                                      Our observation is that CloudSquirrel and other malware authors are aggressively using cloud applications in various stages of the malware attack kill chain. The CloudSquirrel campaign highlights the use of cloud applications for hosting drive-by-download files and, most importantly, to host command and control configuration data. A significant motivation for malware authors to use cloud applications (especially mainstream ones) is that many enterprises lack visibility into SSL traffic by traditional perimeter security vendors like firewalls and proxies. Enterprises – many of whom need to offer access to popular cloud services – are between a rock and a hard place, and often forced to allow these services in the first place, or at least make exceptions for them if blocked. This makes popular cloud services especially susceptible to use by malicious actors in the malware kill chain.

                                      What Should You Do?

                                      Netskope detects CloudSquirrel and other malware in and en route to cloud services. We recommend doing the following:

                                      • Detect and remediate all malware in sanctioned cloud apps
                                      • Detect and remediate all malware being downloaded from unsanctioned cloud apps
                                      • Actively track usage of unsanctioned instances of trusted cloud apps and enforce cloud DLP policies to control files and data entering and leaving your corporate environment
                                      • Regularly back up and turn on versioning for critical content in cloud apps
                                      • Disable macros in all Microsoft Office programs
                                      • Administrators should block macros by default via a group policy
                                      • Warn users to avoid opening untrusted attachments regardless of their extension or filename
                                      • Keep systems and antivirus updated with the latest releases and patches

                                      We have also worked with the cloud application providers to take down the necessary data related to the malicious user accounts and files. We will be publishing a detailed technical blog on CloudSquirrel soon.

                                      author image
                                      Ashwin Vamshi
                                      Ashwin Vamshi is a Security Researcher with innate interest in targeted attacks and malwares using cloud services.
                                      Ashwin Vamshi is a Security Researcher with innate interest in targeted attacks and malwares using cloud services.

                                      Stay informed!

                                      Subscribe for the latest from the Netskope Blog