Cisco Security has detected significant activity related to spam e-mail messages that claim to contain an employee document sharing notification for the recipient. The text in the e-mail message attempts to convince the recipient to open and complete the attached documentation. However, the .zip
attachment contains a malicious .exe
file that, when executed, attempts to infect the system with malicious code.
E-mail messages that are related to this threat (RuleID5467) may contain the following files:
file in the ReturnDocument_189892.zip
attachment has a file size of 136,192 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0x9E7B681D40B8C9422F5489ED522E146A
The following text is a sample of the e-mail message that is associated with this threat outbreak:
Subject: FW: Confidential - ALL Employees Important Document(s)
Please find attached documentation I will need you to complete and send back
to me as soon as you can if that's okay.
Please do not hesitate to contact me if I can provide you with any further
support or assistance.
This e-mail and / or any attachment(s) is intended solely for the
above-mentioned recipient(s) and it may contain confidential or privileged
information. If you have received it in error, please notify us immediately
at firstname.lastname@example.org and delete the e-mail. You must not copy it,
distribute it, disclose it or take any action in reliance on it. For
Affiliate Members, this publication is only intended to provide a summary.
It does not purport to be comprehensive, definitive or to be legal advice.
Changes to the law and government policy may occur quickly. We recommend
that specific legal or other professional advice be obtained about matters
discussed in this publication. We give no warranty (and accepts no
liability) for loss or damage sustained by any person, corporation or other
legal entity as a direct or indirect consequence of their reliance on the
matters contained in this publication. For the future of our children please
consider the environment before printing this email.
Cisco Security 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 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. E-mail 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 e-mail and hostile web URLs from being passed to the end user.
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