Overview
This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then further propagate the virus. Although many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
|
Minimum DAT
5322 (2008-06-20) Updated DAT5322 (2008-06-20) |
Minimum Engine
5.2.00 File Length119296 |
Description Added
2008-06-21 Description Modified2008-06-21 |
Malware Proliferation
Characteristics
| File Property | Property Value |
|---|---|
| File Name | back.exe |
| McAfee Detection | W32/Nuwar@MM |
| Length | 119,296 bytes |
| CRC32 | 290B6991 |
| MD5 | bc2322edd44d94f4a006748f8e85efd7 |
| SHA1 | 4803B1FFB58549A93466B2AC178A124C926F9CBD |
Other Common Detection Aliases
| Company Name | Detection Name |
|---|---|
| AVG (GriSoft) | i-worm/nuwar.u |
| Microsoft | backdoor:win32/nuwar.gen!d |
| Symantec | Trojan.Peacomm.D |
Avert® Labs has observed the following system activities:
| Activity | Risk Level |
|---|---|
| Modifies Memory of Other Processes | High |
| Enumerates running Processes | Medium |
| Creates Registry Keys and Data values persistent on OS Reboot | Low |
| Writes Executable in the Windows Folder | Low |
Other detections that have been observed.
| File Name | McAfee Supported |
|---|---|
| c:\windows\msvupdater.exe | W32/Nuwar@MM |
This sample can be identified by the following symptoms.
System Changes
These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files
The following files have been added to the system:
The following registry elements have been changed:
- msvupdater = c:\windows\msvupdater.exe
Symptoms
This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.
Method of Infection
Viruses are self-replicating. They are often spread by a network or by transmission to a removable medium such as a removable disk, writable CD, or USB drive. Viruses may also spread by infecting files on a network file system or a file system that is shared by another computer.
Removal
All Users:
Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:
2.Update to current engine and DAT files for detection and removal.
3.Run a complete system scan.
Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).
1. Please go to the Microsoft Recovery Console and restore a clean MBR.
On windows XP:
Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
On Windows Vista and 7:
Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.
Variants