Cisco Security Intelligence Operations has detected significant activity related to Portuguese-language spam e-mail messages that claim to contain budget information for the recipient. The text in the e-mail message instructs the recipient to follow a link to view a spreadsheet for additional details. However, the link directs the user to a malicious .zip file containing a malicious .exe file that, when executed, attempts to infect the system with malicious code.
E-mail messages that are related to this threat (RuleID4140) may contain the following files:
Humberto.zip
Humberto.exe
The Humberto.exe file in the Humberto.zip attachment has a file size of 57,344 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0xC1DE9AAE9FABA62AF39CCECC38913B74
The following text is a sample of the e-mail message that is associated with this threat outbreak:
Message Body:
Ola, estamos fazendo uma pesquisa de precos
e gostariamos de saber o valor deste orcamento.
Obs.: (Favor encaminhar resposta para financeiro6@terra.com.br ate dia (15/05/2012)
Aguardo Resposta.
Segue em anexo planilha de orcamento
ANEXO:hxxp://dl.dropbox.com/u/78358058/Humberto.zip
Atenciosamente,
Humberto Ribeiro Alves
3619-2342/ 9131-5223
reinaldoribeir@terra.com.br
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.
Related Links
Cisco Security Intelligence Operations
Cisco Threat Operations Center
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