Blank ‘Business Card’ Emails Contain JavaScript Malware in Attachment

Email with the subject line ‘Business Card’ and no content in the body includes an attached .zip file.

Brief Analysis:
The attached file does not contain a business card as implied by the subject line. Opening the .zip file reveals a malicious JavaScript (.js) file that, if opened, can download and install malware.

Subject: Business Card

[Blank Body]

Attachment: IMG_1670.ZIP

Business Card Malware Email

Detailed Analysis:
Sometimes, even the simplest of tricks can be effective.  In this case, cybercrooks have sent out a malicious email that has no text at all in the body but has the subject line ‘Business Card’.  The email includes an attached .zip file called ‘IMG_1670’.  The implication is that the attached file contains a harmless business card.

Recipients who are still naive to the nefarious ways of the Internet may open the attachment out of simple curiosity. Inside the .zip file, they will find another ‘IMG’ file with the extension ‘.js’. The .js extension means that the file is a JavaScript.  But, if the JavaScript file is opened, it may download and install a version of the Dridex trojan.  Once installed, the trojan can harvest online banking credentials and other sensitive personal information from the infected computer and send it to the criminals. Alternatively, malicious JavaScript attachments like this one may download and install Locky Ransomware.

Details such as the supposed sender, the attachment name, and the purpose of the malware payload may vary in different versions of these emails.

If you receive one of these blank ‘Business Card’ emails, do not open any attachments or click any links that it contains.

Last updated: April 19, 2016
First published: April 19, 2016
By Brett M. Christensen
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