Cisco Security Intelligence Operations has detected significant activity related to spam e-mail messages that instruct users to open an attached file and contact the sender's office for more details. However, the .zip file that is attached to the e-mail message contains a malicious .exe file that attempts to infect the target system with malicious code.
E-mail messages that are related to this threat (RuleID2520) may be associated with the following files:
info.zip
info.exe
The info.exe file (RuleID2520) in the .zip attachment has a file size of 28,610 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0xFC9EAA5E85E9843DDB184C7197FC5E40
The following text is a sample of the e-mail message that is associated with this threat outbreak:
Subject: get back to my office for more details
Message Body:
Please read the attached letter and get back to my office for more details to proceed further.
Thanks and have a very nice day.
Malicious software installed by files that are distributed via these messages show characteristics of Trojan.Agent. The trojan has the ability to spy on the browsing habits of users, modify browser settings, and download additional malicious files on the affected system.
Cisco Security Intelligence Operations analysts examine real-world e-mail 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 e-mail security threats and trends. Cisco will continue to monitor this threat and automatically adapt IronPort systems to protect customers. This report will be updated if there are significant changes or if the risk to end users increases.
Cisco IronPort Virus Outbreak Filters protect customers during the critical period between the first exploit of a virus outbreak and the release of vendor antivirus signatures. E-mail that is managed by Cisco and end users who are protected by Cisco IronPort web security appliances will not be impacted by these attacks. Cisco IronPort appliances are automatically updated to prevent both spam e-mail and hostile web URLs from being passed to the end user.
Related Links
Cisco Security Intelligence Operations
Cisco Threat Operations Center
Cisco SenderBase Security Network
