Malware para Mobile se Passa por Opera Mini

segunda-feira, 24 de outubro de 2011 por Administrador


O recente crescimento na computação móvel traz consigo a necessidade browsers bons e confiáveis para dispositivos móveis, tal como o Opera Mini, instalados em seus smartphones ou outros dispositivos. Acreditamos que é por isso que os cyber criminosos atualmente utilizam o Opera Mobile como disfarce de malware para mobile.

Encontramos um website aparentemente desenvolvido para ser visualizado em um dispositivo móvel. O site, que é russo, se parece com o site do Opera. Ele imediatamente informa aos visitantes que eles precisam atualizar suas versões do Opera Mini.

opera

Figura 1. O site falso do Opera Mini

Todos os links do site levam ao download do arquivo malicioso OperaMini.jar, que foi detectado pela Trend Micro como J2ME_GAKEBROWS.A.

Quando executado, ele verifica se o telefone utiliza certos centros de serviço e inicia o envio de mensagens de texto para números de contas com acesso à internet. Ele afeta dispositivos que suportam MIDlets - um programa Java embarcado para dispositivos, especificamente Java 2 Micro Edition (J2ME).

Bloqueamos acesso ao site malicioso e estamos atualmente monitorando à procura de mais atividade maliciosa relacionada.

Usuários podem encontrar dicas de como proteger sues dispositivos móveis na página de malware móvel na Threat Encyclopedia (em inglês). Aconselhamos que visitem também o site oficial do Opera, http://opera.com ou http://operamini.com caso desejem instalar esse browser em seus dispositivos.

Adicionalmente, encontramos outro malware móvel que se passa pelo instalador do Opera Mini, só que desta vez direcionado a usuários do Android. Detectado como ANDROIDOS_FAKEBROWS.A, este malware abusa de contas com acesso à internet, enviando mensagens e provocando gastos indesejados aos usuários infectados.

Usuários devem instalar o Opera Mini somente à partir do site oficial do Opera para evitar contaminação.

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