Threat Outbreak Alert: Fake Invoice Email Messages on November 7, 2013

2013-11-07T14:27:56
ID CISCO-THREAT-31671
Type ciscothreats
Reporter Cisco
Modified 2013-11-07T14:27:56

Description

Medium

Alert ID:

31671

First Published:

2013 November 7 14:27 GMT

Version:

1

Summary

  • Cisco Security has detected significant activity related to spam email messages that claim to contain an invoice statement for the recipient. The text in the email message attempts to convince the recipient to open the attachment and 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 (RuleID7750) may contain the following files:

> _Invoice_5566489.zip
Invoice_07112013.exe
TT Application (2).zip
TT Application.exe _

The Invoice_07112013.exe file in the Invoice_5566489.zip attachment has a file size of 23,552 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x90D968AAB763EA0E91C357E47F10372D.

The TT Application.exe file in the_ TT Application (2).zip_ attachment has a file size of 395,777 bytes. The MD5 checksum is the following string: 0xBC5BC6C2C634C70A707D0934121E1FFB

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

> Message Body:

Please see attached copy (Invoice_5566489) of the original invoice.

Or

> Subject: Dear Sir

Message Body:

Dear Sir,
Please find attached a copy of the TT application and find out if it corresponds with the account information attached by the buyer.
Rgds,

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-November-07 14:27 GMT
    Show Less

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