Threat Outbreak Alert: Fake Fax Invoice Email Messages on November 20, 2013

2013-11-20T14:41:24
ID CISCO-THREAT-31836
Type ciscothreats
Reporter Cisco
Modified 2013-11-20T14:41:24

Description

Medium

Alert ID:

31836

First Published:

2013 November 20 14:41 GMT

Version:

1

Summary

  • Cisco Security has detected significant activity related to spam email messages that claim to contain a fax message notification relating to an invoice for the recipient. The text in the email message attempts to convince the recipient to open the attachment to view the attached invoice. 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 (RuleID7950) may contain the following files:

> Invoice_12653434.zip
Invoice_12653434.exe

The Invoice_12653434.exe file in the Invoice_12653434.zip attachment has a file size of 25,600 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x91ADE7D94244104D8CD6FC26BE839C62

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

> Subject: Response to Delivered Fax

Message Body:

The attached mail was received in response to a Fax2Mail user
for which you are listed as an administrator.
You can find your invoice attached.
Regards,
Jim Clay
CONFIDENTIAL NOTICE: The contents of this message, including any attachments, are confidential and are intended solely for the use of the person or entity to whom the message was addressed. If you are not the intended recipient of this message, please be advised that any dissemination, distribution, or use of the contents of this message is strictly prohibited. If you received this message in error, please notify the sender. Please also permanently delete all copies of the original message and any attached documentation. Thank you

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-20 14:41 GMT
    Show Less

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