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Threat Outbreak Alert

Threat Outbreak Alert: Malicious Tax Return Notification Email Messages on March 19, 2014

 
Threat Type:IntelliShield: Threat Outbreak Alert
IntelliShield ID:23586
Version:4
First Published:2011 July 06 14:36 GMT
Last Published:2014 May 20 12:57 GMT
Port: Not available
Urgency:Possible use
Credibility:Confirmed
Severity:Harassment
 
 
Version Summary:Cisco Security Intelligence Operations has detected significant activity on March 19, 2014.
 

Description
 
Cisco Security Intelligence Operations has detected significant activity related to spam email messages that claim to contain a tax return notification for the recipient. The text in the email message attempts to persuade the recipient to open the attachment to view details. However, the .zip attachment contains malicious .exe file, that when executed, attempts to infect the system with malicious code.

Email messages that are related to this threat (RuleID858KVR) may contain the following files:

doc.zip
doc.exe
Tax Report.zip
Tax Report.xls.exe
Your_2013_TaxReturnReport.zip
Your_2013_TaxReturnReport.exe
Docs.zip
docs2515.scr

The doc.exe file has a file size of 29,696 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0xB70B79F904984165FB0E3E8AE6B6CF8B

The Tax Report.xls.exe file in the Tax Report.zip attachment has a file size of 80,384 bytes. The MD5 checksum is the following string: 0x6FE4D3639767FF5376EE62BEE3CA862D

The Your_2013_TaxReturnReport.exe file in the Your_2013_TaxReturnReport.zip attachment has a file size of 224,768 bytes. The MD5 checksum is the following string: 0x459910B4C3ECFF73C8505B1AB0ADC5EC

The docs2515.scr file in the docs.zip attachment has a file size of 22,016 bytes. The MD5 checksum is the following string: 0x8042EAF499CE340E614E12F711A07309

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

Subject: IRS notification letter

Message Body:

Department of Tresaury Internal Revenue Source

Important information about your tax return

Or

Subject: Tax Agent Report - Delayed Tax Returns

Message Body:

Please do not respond to this email
Tax agent report for delayed tax returns over 30 days
Please find attached your weekly report for the period ending 10/01/2013
What you need to do
Refer to the initial notification email with attachment we sent you with instructions on how to interpret your tax agent report.
Yours sincerely
Deputy Commissioner of Taxation

Or

Subject: 2013 Tax Return Report!

Message Body:

Dear Member
Your 2013 tax return is under investigation, attached is a copy of the report. Kindly download, read and get back to us as soon as possible
Thanks
Internal Revenue Service

Or

Subject: FW: Important docs

Message Body:

We have received this documents from your bank, please review attached documents.
Terri Dewitt
Wells Fargo Accounting

Cisco Security Intelligence Operations 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 Virus Outbreak Filters 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 appliances are automatically updated to prevent both spam email and hostile web URLs from being passed to the end user.

Related Links
Cisco Security Intelligence Operations
Cisco SenderBase Security Network
 
Alert History
 

Version 3, March 17, 2014, 8:37 AM: Cisco Security Intelligence Operations has detected significant activity on March 12, 2014.

Version 2, January 16, 2013, 12:15 PM: Cisco Security Intelligence Operations has detected significant activity on January 15, 2013.

Version 1, July 6, 2011, 6:36 AM: Cisco Security Intelligence Operations has detected significant activity on July 6, 2011.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
IntelliShieldThreat Outbreak Alert Original Release Base

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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