Backdoor.WinShell.50

Backdoor.WinShell.50 is a server program that allows unauthorized access to an infected computer. The Backdoor will listen on port 8719.

This piece of malware, along with Trojan.Stealther.B, has recently been found on systems that the Microsoft DCOM RPC vulnerability has exploited.

Symantec Security Response has developed a removal tool to clean infections of Backdoor.Winshell.50 and Trojan.Stealther.B.

NOTE: Virus definitions dated August 6, 2003 may detect this as Backdoor.Winshell.

Protection

• Initial Rapid Release version August 7, 2003
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version August 7, 2003 revision 003
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date August 13, 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: Moderate

Damage

• Damage Level: Medium

Distribution

• Distribution Level: Low