Threat Outbreak Alert: Fake Fax Message Delivery Email Messages on November 11, 2013

2013-11-11T20:12:22
ID CISCO-THREAT-31707
Type ciscothreats
Reporter Cisco
Modified 2013-11-11T20:12:22

Description

Medium

Alert ID:

31707

First Published:

2013 November 11 20:12 GMT

Version:

1

Summary

  • Cisco Security has detected significant activity related to spam email messages that claim to contain an eFax message notification for the recipient. The text in the email message attempts to convince the recipient to open the attachment for 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 (RuleID7796) may contain the following files:

>
Fax_131111.zip
Fax_131111.exe

The Fax_131111.exe file in the Fax_131111.zip attachment has a file size of 25,088 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x899006990800023BE74C6414F4B359E7

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

>
Subject: Corporate eFax message from "698-853-9793" - 1 pages

Message Body:

Fax Message [Caller-ID: 698-853-9793]
You have received a 1 pages fax at 2013-11-11 01:11:11 CST.
* The reference number for this fax is latf1_did11-1814924154-8859275426-53.
View this fax using your PDF reader.
Please visit www.eFax.com/en/efax/twa/page/help if you have any questions regarding this message or your service.
Thank you for using the eFax service!
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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-November-11 20:12 GMT
    Show Less

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