Trojan.Jasbom

Trojan.Jasbom is a Trojan horse that attempts to exploit the Microsoft Internet Explorer ITS Protocol Zone Bypass Vulnerability (as described in the Microsoft Security Bulletin MS04-013). The Trojan logs keystrokes, mouse clicks, and application memory, when using the application Lineage. The Trojan sends this logged information to a Web site on the j4sb.com domain.

Notes:

• Definitions dated prior to May 12, 2005 may detect this threat as PWSteal.Lineage.
• On May 15, 2005, the company Kakaku.com acknowledged that their Web site may have been compromised between May 11-14, 2005. During this time, Trojan.Jasbom was installed on their Web server. Computer users who accessed this Web site with unpatched versions of Internet Explorer may have had this Trojan downloaded to their computers between these dates.

Protection

• Initial Rapid Release version May 16, 2005
• Latest Rapid Release version June 22, 2009 revision 066
• Initial Daily Certified version May 16, 2005
• Latest Daily Certified version June 19, 2009 revision 051
• Initial Weekly Certified release date May 16, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Low