Name :	Email-Worm:W32/Zhelatin.CT
Category:	Malware
Type:	Rootkit, Email-Worm
Platform:	W32
Date of Discovery:	April 08, 2007

The Zhelatin.CT worm started to spread on April 13th, 2007. The worm spreads in e-mails with love-related subjects and with attachments named "Love Card.exe", "Greeting Card.exe" and so on. A bit later the same variant spread using security-related subjects.

The functionality of the Zhelatin.CT worm variant is similar to Zhelatin.CQ , however the subjects and attachment names it uses are different.

On April 13th several e-mails with love themed subjects were seen in the wild. While some of the subjects are a rehash of previously used subjects such as Sending You My Love, The Dance of Love, and When I'm With You, others are new:


The e-mail messages themselves have no text, instead, they have attached executables with romantic sounding filenames. These include:


Here is an example of the worm's e-mail:



A second run occurred after a few hours. This time, the subjects were security related:


Furthermore, the message body is an image file which advises the receiver to patch their systems. Also included within the image is a password in order to extract the attachment. Here is an example:



Something new to the Zhelatin family is the use of a password protected Zip archive as an attachment. The filenames vary but they have the following format:


The executable contained within the Zip archive has the same name as that of the archive but with an EXE extension.