Originally posted by Koku:
ok it says that it is infected by W95/Puron virus and cannot be cleaned

What do I do when a virus cannot be cleaned or deleted?
For some viruses, your computer’s operating system might impose restrictions requiring you to manually clean your computer if it's infected.

If your computer cannot clean or delete a virus, please consult the Virus Information Library at http://uk.mcafee.com/virusInfo/default.asp for instructions on manually deleting the virus.

If the virus prevents you from using your Internet connection or from using your computer at all, try using a Rescue Disk to start your computer. In many cases, the Rescue Disk can start a computer if a virus disables it. See “Creating a Rescue Disk” for details.

For more help, consult McAfee Customer Support at the McAfee web site.

Email-Worm.Win32.Puron

Email-Worm.Win32.Puron (Kaspersky Lab) is also known as: I-Worm.Puron (Kaspersky Lab), W95/Puron (McAfee),
This is a virus-worm that spreads via infected e-mails, and infects Windows EXE files on computers. The worm's routines have bugs, and in some cases, halt the computer and/or corrupt files while infecting them.

The worm code has the "copyright" text strings:

(c)Vecna
Vecna is a punk rocker now...
Infected File Run
The worm can enter a computer via infected e-mails from the local network or from any other infected file that is executed.

When the worm starts, it extracts from an infected file its "main" code (that is "pure" virus code - Win32 PE EXE file 9.5 Kb of size), saves it to the Windows TEMP directory with a randomly selected name (for example, LNBAMKON.EXE, MMCAAHAN.EXE) and executes that file.

When the virus' "main" code gains control, it moves its file to the Windows directory that is referenced in the Registry key:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
Common Startup = %startup%
The %startup% directory name depends in Windows version, for example:

\Documents and Settings\All Users\Start Menu\Programs\Startup
%WindowsDir%\All Users\Start Menu\Programs\Startup
The worm moves itself to that %startup% directory with a random name that has eight randomly selected digits and an .EXE extension, for example:

00544102.EXE
17060133.EXE
37154273.EXE
The worm then executes that copy in the "Startup" directory, and deletes the first copy in the Windows TEMP directory, for example:

C:\VIRUS.EXE - infected file is run
C:\WINDOWS\TEMP\MMCAAHAN.EXE - 1st copy is created and run
C:\WINDOWS\All Users\Start Menu\Programs\Startup\00544102.EXE - this is 2nd copy, it is created here and executed. The 1st copy is deleted then.
Because of a bug, in some cases, the worm crashes in the middle of this process, and the 1st copy is left in the TEMP directory.

When this "file moving" process is complete, the worm installs a "stealth" hook, and runs the infection and e-mail spreading routines.

Infection
The infection routine when gains control, searches for a .EXE and .SCR Windows executable file on all local and network drives, and infects them. While infecting, it obtains a block from the file middle, compresses it, and stores the compressed data and worm code in the file so that the file length does not increase.

The worm also uses a polymorphic mutation engine to make the detection and disinfection process more complex.

E-mail spreading
To spread itself, the worm connects to a SMTP mail server, and sends infected messages to e-mail addresses. Both the SMTP server name and e-mail addresses, the worm obtains from WAB data files (Windows Address Book).

The infected messages are of HTML format and have fields:

From: "Mondo bizarro" [mourning@obituary.org]
Subject: Joey is dead, man... :-(
Text: A tribute to Joey Ramone (1951-2001)
Attach: ramones.mp3.exe
The worm uses one of the security vulnerabilities (Vulnerability identifier: CAN-2001-0154) that were found in MS Windows in 2001. The result of this breach is the possibility of spawning an attached EXE file without a user's action. When an infected e-mail is opened for reading or preview, the worm's EXE file is automatically run.

Microsoft already has released a patch that eliminates this vulnerability. Additional information may be found here: http://www.microsoft.com/technet/security/bulletin/MS01-020.asp

Stealth
The worm hooks FindFile and FindProcess Windows system calls (FindFirstFileA, FindNextFileA, Process32First, Process32Next). The worm processes these calls so that its copy in the "startup" directory (see above) is not reported. As a result, the worm file is not visible in files and processes lists.

Originally posted by Koku:
Ok if I do have this virus why does it only show up here? and what can i do about it?