Cisco Security Intelligence Operations has detected significant activity related to Portuguese-language spam e-mail messages that claim to contain the recipient's account statement details for review. The text in the e-mail message attempts to convince the recipient to follow a link and view the details. However, the link directs the user to a malicious .zip file containing an .exe file that, when executed, attempts to infect the system with malicious code.
E-mail messages that are related to this threat (RuleID4145, RuleID4152, and RuleID4152KVR) may contain any of the following files:
Demonstrativo_13BVT529.zip
Demonstrativo_13BVT529.exe
Demonstrativo_13BVT5299.zip
Demonstrativo_13BVT5299.exe
The Demonstrativo_13BVT529.exe file in the Demonstrativo_13BVT529.zip attachment has a file size of 168,448 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x662A521794E6542343043918D2A48E95
The Demonstrativo_13BVT5299.exe file in the Demonstrativo_13BVT5299.zip attachment has a file size of 168,448 bytes. The MD5 checksum is the following string: 0xA827598CABE9241BF46B58C8BF2B296C
A variant of the Demonstrativo_13BVT5299.exe file in the Demonstrativo_13BVT5299.zip attachment has a file size of 168,448 bytes. The MD5 checksum is the following string: 0x675BCECCD2935A040C9AF5A690B3E8FE
The following text is a sample of the e-mail message that is associated with this threat outbreak:
Subject: Problemas em sua declara? 2012
Message Body:
receita
Sua declara? de nmero 13BVT529/2012 est?endente de Retifica?.
A Receita Federal agora com parceria com SERPRO analisou todas as Declara?s feitas
em 2012 a fim de solucionar problemas pendentes em nosso sistema.
Analisando seu CPF/CNPJ encontramos diverg?ias, estamos enviando um demonstrativo dos nmeros apresentados
e dos nmeros divergentes, favor verifique os dados contidos no demonstrativo para corre?, e a falta de corre?
de sua declara? acarretar? inclus?da mesma na malha fina .
> Demonstrativo_13BVT529.zip
Cisco Security Intelligence Operations analysts examine real-world e-mail traffic data that is collected from over 100,000 contributing organizations worldwide. This data helps provide a range of information about and analysis of global e-mail security threats and trends. Cisco will continue to monitor this threat and automatically adapt IronPort systems to protect customers. This report will be updated if there are significant changes or if the risk to end users increases.
Cisco IronPort Virus Outbreak Filters protect customers during the critical period between the first exploit of a virus outbreak and the release of vendor antivirus signatures. E-mail that is managed by Cisco and end users who are protected by Cisco IronPort web security appliances will not be impacted by these attacks. Cisco IronPort appliances are automatically updated to prevent both spam e-mail and hostile web URLs from being passed to the end user.
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