Hachilem.b is a trojan that steals user e-mail address and registers it to a porn service without user knowledge and permission. Once executed, the parasite installs itself to the system, steals the default e-mail address of Microsoft Outlook, collects computer information and user name. It transfers gathered data to a predetermined adult web site and registers the user. Then Hachilem.b opens that web site. It also periodically displays porn images and Japanese messages asking the user to pay for the porn service. Hachilem.b runs on every Windows startup.