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Name msvchost.exe


Trojan.Xombe is a Trojan horse that has two components: a 4,096 byte downloader and a 27,136 byte Trojan.
The downloader component will retrieve the Trojan file from a predetermined Web site.

The download component has been distributed in an unsolicited email, purporting to be a security update for Windows XP, sent by Microsoft.
The email has the following characteristics:
Subject: Windows XP Service Pack 1 (Express) - Critical Update.
Body: "Window Update has determined that you are running a beta version of Windows XP Service Pack 1 (SP1)." And so on.
Attachment: winxp_sp1.exe

When the winxp_sp1.exe is executed, it will download another Trojan component from a predetermined Web site and execute it.
When this secondary file is executed, it will perform the following actions:
Creates a copy of itself as %System%\msvchost.exe.
This contains functionality to submit system information, download, and execute additional files from the predetermined Web site.

Adds the value:
"msvcc" = "%system%\msvchost.exe"
in the registry key:

Contacts the predetermined Web site a second time and accesses several scripts and submits information.

To prevent this Trojan from running, outgoing HTTP connections to domain can be blocked.
Remove it from startup by antivirus (also check How To Remove section)Startup Optimizer.

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