Sophos

Troj/Mssvc-A

Category
Type
What to do
Prevalence low high

Summary

 
Protection available since 9 January 2004 14:24:45 (GMT)
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Action

Please follow the instructions for removing Trojans.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\mssvc

and delete it if it exists.

Close the registry editor.

More Information

Troj/Mssvc-A is a remotely configurable distributed denial-of-service Trojan.

The Trojan copies itself as msvchost.exe in the Windows system folder and creates the following registry entry to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\mssvc

Troj/Mssvc-A connects to a remote website to which it passes the current country and operating system of the infected computer. It retrieves a list of URLs to which it tries to connect.

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