Last Updated on Monday, 25 June 2012 20:14 Tuesday, 02 February 2010 13:03
The file names SOHA.EXE, serverupd.exe, server.exe have appeared in an virus analysis report. You can see it on this link
The installer is about 102 kb. It installs a component of backdoor Trojan Bifrose or BiFrost. It connects to remote hosts. It can download harmful files from the internet. A good firewall can detect harmful activities and prevent them. Some good freeware are ZoneAlarm Free Firewall, and Comodo Internet Security Free Edition (you can choose to install just the firewall from their security suite)It infects Internet explorer browser. It attaches a keylogger with Internet Explorer. That will steal your user ID and passwords. So do not use Internet explorer until the virus is removed.
It creates the files SOHA.EXE, serverupd.exe, server.exe on the infected computer that you need to search and delete. You should end running processes named SOHA.EXE, serverupd.exe, server.exe, from Task Manager. And also remove the file's entries from windows startup.
There are several variations in the EXE file names used by this virus. I have grouped them together in BiFrost Family
Statutory Warning: It is possible that some legitimate application may be using the same name as that of the virus files. Use Windows Defender or SysInternal Process Explorer to differentiate between them.
Using System Restore
If you know the duration since your computer is infected, you can try to restore your computer at a prior date, that will be an easy way to undo the changes done by the virus
Using system restore in windows XP
Using system restore in windows Vista
Boot in safe mode
Sometimes you can not delete a file. You should boot in safe mode and then try to delete it.
- How to boot in safe in windows XP
- How to boot in safe mode in windows Vista
You need to enable to view hidden files and folders before searching.
- How to Enable to View Hidden Files and Folders in Windows XP
- How to Enable to View Hidden Files and Folders in Windows Vista
Remove Processes from Task Manager
Press Ctrl Alt Del keys to open the Task Manager. Select Processes tab. You will see a list. Look for the names SOHA.EXE, serverupd.exe, server.exe in it. Select if found and press the End Process button. It will ask for your confirmation to end that process. Select Yes. You can end one process at a time.
You can find out if a process in Task Manager is good or bad by using Windows Defender. It shows the path of a process and its publisher. Harmful processes may be shown under Unknown Publisher in windows defender.
How to use Windows Defender in windows XP
How to use Windows Defender in windows VistaOr you can use Sysinternal's Process Explorer.
- How to use Sysinternal's Process Explorer
Removing entry from windows startup
The system configuration can be started in xp and in vista by typing msconfig in the run box/ start menu search box. In xp by clicking on Start > run . The windows startup is reversible. You can check / uncheck any entry from windows startup any number of times.
Open system configuration window. Click on the Startup tab. You will see a list all the programs that are scheduled to start with windows. Expand the middle column using your mouse pointer. That will show you the full path of the program. Locate and uncheck the boxes in front of these names "SOHA.EXE, serverupd.exe, server.exe" (also look for any other suspicious names) Press Apply , Press Close/Ok , Select "restart" at the next prompt.Deleting files
The computer will restart now. Delete the following files and folders. Boot in safe mode or boot in the dos prompt if needed. You can use windows search utility to search for SOHA.EXE, serverupd.exe, server.exe and find out if there are any other instances of this file present elsewhere in the computer.
[file and pathname of the sample #1]
Registry KeysSome of the registry keys will be automatically removed if you run Registry menu of CCleaner. For others you can see the report mentioned at the beginning of this article
You can easily remove the files in the temp folder by running CCleaner. You can set CCleaner to run automatically each time the computer starts.
Do not forget to run CCleaner > Registry menu to remove the obsolete registry entries.
more about CCleaner on this link
Free tools to repair disabled folder options, registry, Task Manager etc
Whereas you can repair disabled Folder Options, disabled Registry Tools, disabled Task Manager, Disabled System Restore etc using these free tools
Tools for Windows XP
Tools for Windows Vista
Use the System File Checker
To repair windows system files.
- How to run System File Checker utility in windows XP
- How to run System File Checker utility in windows Vista
Reprinted with permission from Threatexpert.com
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