Summary
Xombe trojan downloader was sent as an email attachment to a large amount of people on 9th of January 2004. When run, the trojan downloader connects to Internet and downloads and activates another trojan on a victim's computer. UPDATE ON 10TH OF JANUARY 2003 The site used by this trojan (gamemaniacs.org) has now been disabled and this trojan won't be able to function any more.
Removal
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Technical Details
Xombe trojan downloader was sent to a large amount of people in the email that looks like that:
From: windowsupdate@microsoft.com Subject: Windows XP Service Pack 1 (Express) - Critical Update. Window Update has determined that you are running a beta version of Windows XP Service Pack 1 (SP1). To help improve the stability of your computer, Microsoft recommends that you remove the beta version of Windows XP SP1 and re-install Windows XP SP1. If you cannot remove the beta version, you should still reinstall Windows XP SP1. Windows XP SP1 provides the latest security, reliability, and performance updates to the Windows XP family of operating systems. Windows XP SP1 is designed to ensure Windows XP platform compatibility with newly released software and hardware, and includes updates to resolve issues discovered by customers or by Microsoft's internal testing team. The maximum download size is approximately 3 MB, however the size of the download and time required may be less for computers that have had updates previously installed. To minimize the download time needed for installation, setup will only download those files which are required to bring your computer up to date. Windows XP SP1 includes Internet Explorer 6 SP1. Anti-virus software programs may interfere with the installation of Windows XP SP1. Please disable anti-virus software while installing the service pack. Just run the file winxp_sp1.exe in attach and make sure to restart your PC after installation will be completed. (c) 2004 Microsoft Corporation. All rights reserved. Terms of Use Privacy Statement Attachment: winxp_sp1.exe
When the trojan downloader is run by a user, it connects to Internet and downloads another trojan.
Trojan components
The trojan consists of three components:
winxp_sp1.exe
This file is the first-stage downloader that comes in email. The only purpose of this program is to fetch the main component of the trojan and plant in on the target system.
msvchost.exe
This is the main component of the trojan. It is a general-purpose downloader application that is controlled through a certain web page. It can fetch arbitrary files from the Internet and install them on the infected system.
msvchost.exe is installed to the System Directory on the infected computer and added to the registry as [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\mssvc] When the trojan was first intercepted the website instructed the clients to download a DLL file.
http_f.dll
http_f.dll is an HTTP client which is apparently used to perform a Distibuted Denial-of-Service attack on a website that hosts forums. This file is also dropped to the System Directory, just like the main component.
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