fechar
fechar
Sua Rede do Amanhã
Sua Rede do Amanhã
Planeje seu caminho rumo a uma rede mais rápida, segura e resiliente projetada para os aplicativos e usuários aos quais você oferece suporte.
          Experimente a Netskope
          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.
            Líder em SSE. Agora é líder em SASE de fornecedor único.
            Líder em SSE. Agora é líder em SASE de fornecedor único.
            A Netskope estreia como líder no Quadrante Mágico™ do Gartner® para Single-Vendor SASE
              Protegendo a IA generativa para leigos
              Protegendo a IA generativa para leigos
              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
                Prevenção Contra Perda de Dados (DLP) Moderna para Leigos
                Get tips and tricks for transitioning to a cloud-delivered DLP.
                  Livro SD-WAN moderno para SASE Dummies
                  Modern SD-WAN for SASE Dummies
                  Pare de brincar com sua arquitetura de rede
                    Compreendendo onde estão os riscos
                    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.
                        Os 6 casos de uso mais atraentes para substituição completa de VPN herdada
                        Os 6 casos de uso mais atraentes para substituição completa de VPN herdada
                        Netskope One Private Access is the only solution that allows you to retire your VPN for good.
                          A Colgate-Palmolive protege sua “propriedade intelectual "” com proteção de dados inteligente e adaptável
                          A Colgate-Palmolive protege sua “propriedade intelectual "” com proteção de dados inteligente e adaptável
                            Netskope GovCloud
                            Netskope obtém alta autorização do FedRAMP
                            Escolha o Netskope GovCloud para acelerar a transformação de sua agência.
                              Let's Do Great Things Together
                              A estratégia de comercialização da Netskope, focada em Parcerias, permite que nossos Parceiros maximizem seu crescimento e lucratividade enquanto transformam a segurança corporativa.
                                Netskope solutions
                                Netskope Cloud Exchange
                                Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.
                                  Suporte Técnico Netskope
                                  Suporte Técnico Netskope
                                  Nossos engenheiros de suporte qualificados estão localizados em todo o mundo e têm diversas experiências em segurança de nuvem, rede, virtualização, fornecimento de conteúdo e desenvolvimento de software, garantindo assistência técnica de qualidade e em tempo hábil.
                                    Vídeo da Netskope
                                    Treinamento Netskope
                                    Os treinamentos da Netskope vão ajudar você a ser um especialista em segurança na nuvem. Conte conosco para ajudá-lo a proteger a sua jornada de transformação digital e aproveitar ao máximo as suas aplicações na nuvem, na web e privadas.

                                      Netskope Threat Coverage: DearCry Ransomware

                                      Mar 15 2021

                                      Summary

                                      On March 2, Microsoft released patches for four zero-day vulnerabilities affecting Exchange Server 2013, 2016, and 2019 (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065). In the following weeks, attackers have been aggressively targeting vulnerable servers to install web shells that provide persistent remote access to infected servers. On March 9, attackers began installing a new ransomware variant known as DearCry or DoejoCrypt on infected servers. DearCry copies and encrypts files and then overwrites and deletes the originals, a tactic previously employed by WannaCry. The samples do not contain any command and control connection to start encryption, instead using a hard-coded key to begin encryption immediately at infection time.

                                      If you are currently running a vulnerable Exchange server, we advise that you patch it immediately. Microsoft has released security updates and detailed technical guidance to help.  

                                      Protection

                                      Netskope Threat Labs is actively monitoring DearCry. Currently, use of DearCry has been limited to vulnerable Exchange servers. Each victim is targeted with a different sample, but the attackers have not employed any evasion techniques. We expect DearCry to be chained with other attacks in the near future and to begin employing common evasion and obfuscation techniques as it matures. 

                                      DearCry ransomware samples are detected by Netskope Threat Protection as  Gen:Variant.Ransom.DearCry.1Netskope Advanced Threat Protection provides proactive coverage against DearCry using both our ML and heuristic-based static analysis engines and our cloud sandbox.

                                      • Gen.Malware.Detect.By.Sandbox indicates a sample that was detected by Netskope’s cloud sandbox
                                      • Gen.Malware.Detect.By.StHeur indicates a sample that was detected by one of Netskope’s static analysis engines

                                      Hashes

                                      • 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff
                                      • e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6
                                      • feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede
                                      author image
                                      Ray Canzanese
                                      Ray is the Director of Netskope Threat Labs, which specializes in cloud-focused threat research. His background is in software anti-tamper, malware detection and classification, cloud security, sequential detection, and machine learning.
                                      Ray is the Director of Netskope Threat Labs, which specializes in cloud-focused threat research. His background is in software anti-tamper, malware detection and classification, cloud security, sequential detection, and machine learning.

                                      Mantenha-se informado!

                                      Assine para receber as últimas novidades do Blog da Netskope