Backdoor.WinShell.50.b

Backdoor.WinShell.50.b is a server program that allows unauthorized access to an infected computer. This Trojan Horse is a variant of Backdoor.WinShell.50. The Backdoor uses port 39581 to communicate with it client(s). This threat is usually double-packed.

The original Backdoor.WinShell.50, with Trojan.Stealther.B, is associated with the Microsoft DCOM RPC vulnerability exploit.

Protection

• Initial Rapid Release version August 11, 2003
• Latest Rapid Release version March 3, 2008 revision 035
• Initial Daily Certified version August 11, 2003
• Latest Daily Certified version March 3, 2008 revision 037
• Initial Weekly Certified release date August 11, 2003

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