Description
Cisco Security Intelligence Operations has detected significant activity related to spam e-mail messages that claim to contain a fax message notification for the recipient. The text in the e-mail message attempts to persuade the recipient to open the attachment and view the details. 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 (RuleID5329) may contain the following files:
fax_message_9586670910-9854245494-29_19022013.zip
fax_message_{DIGIT[10]}-{DIGIT[10]}-{DIGIT[2]}_19022013.exe
The fax_message_{DIGIT[10]}-{DIGIT[10]}-{DIGIT[2]}_19022013.exe file in the fax_message_9586670910-9854245494-29_19022013.zip attachment has a file size of 132,608 bytes. The MD5 checksum, which is a unique identifier of the executable, is the following string: 0xC0A98D3BD1BD9C2B95CE402B1BCFD8BC
The following text is a sample of the e-mail message that is associated with this threat outbreak:
Subject: Corporate eFax message - 3 pages
Message Body:
Fax Message [Caller-ID: 628-634-6607]
You have received a 3 pages fax at 19-02-2013 10:27:17 .
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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Source: Cisco