Threat Outbreak Alert: Fake Invoice Notification Email Messages on October 24, 2013

2013-10-25T14:19:59
ID CISCO-THREAT-31493
Type ciscothreats
Reporter Cisco
Modified 2013-10-25T14:19:59

Description

Medium

Alert ID:

31493

First Published:

2013 October 25 14:19 GMT

Version:

1

Summary

  • Cisco Security has detected significant activity related to Portuguese-language spam email messages that claim to contain an electronic invoice notification for the recipient. The text in the email message attempts to convince the recipient to open the attachment to view the details. However, the .zip attachment contains a malicious .exe file that, when executed, attempts to infect the system with malicious code.

Email messages that are related to this threat (RuleID7602) may contain the following files:

> Nf Vivo.zip
Nf Vivo.exe

The Nf Vivo.exe file in the Nf Vivo.zip attachment has a file size of 810,886 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x22AECDBB50FAFF6BAAC1B477B9F43785

The following text is a sample of the email message that is associated with this threat outbreak:

> Subject: Vivo - Emissão de nota fiscal eletrônica.

Message Body:

Sr(a). Contribuinte,
Estamos enviando esta mensagem da Nota Fiscal Eletrônica de Serviços No. 27-13
emitida pelo prestador de serviços:
Razão Social: VIVO PARTICIPAÇÕES S...A.
Email: ASSISTENTEFINANCEIRO@VIVO.COM.BR
NIRE 35.3.0015879-1
CNPJ: 02.558.074/0001-73
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Cisco Security analysts examine real-world email 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 email security threats and trends. Cisco will continue to monitor this threat and automatically adapt systems to protect customers. This report will be updated if there are significant changes or if the risk to end users increases.

Cisco security appliances protect customers during the critical period between the first exploit of a virus outbreak and the release of vendor antivirus signatures. Email that is managed by Cisco and end users who are protected by Cisco Web Security Appliances will not be impacted by these attacks. Cisco security appliances are automatically updated to prevent both spam email and hostile web URLs from being passed to the end user.

Related Links
Cisco Security
Cisco SenderBase Security Network

Revision History

  • Version | Description | Section | Date
    ---|---|---|---
    1 | Initial Release | | 2013-October-25 14:19 GMT
    Show Less

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