This trojan horse provides an example of a well done social engineering approach, designed to deceive users into opening the ZIP based attachment. The appearance, message, and wording are realistic. Users should always be cautious and avoid taking action based on email messages alone.   

Clagger.E - New Realistic Paypal based scam
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=TROJ%5FCLAGGER%2EE

Clagger.E - Behavioral Diagram
http://www.trendmicro.com/vinfo/images/TROJ_CLAGGER_E2_BD.gif

EMAIL MESSAGE TO BLOCK OR AVOID
http://www.trendmicro.com/vinfo/images/TROJ_CLAGGER_E2_img.gif