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CHAPTER 9 HOW TO SEC URE Y OUR COMPUTE R
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Scanning for Viruses
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With Windows virus scanners, you might be used to performing whole system scans. This isn t advisable with ClamAV, because it simply isn t designed for that task. Instead, ClamAV is designed to scan user files, such as documents.
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Note ClamAV is actually primarily designed to be used in concert with a mail server and to scan incoming
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or outgoing mail attachments. See the About page at the ClamAV web site (www.clamav.org/about).
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You can try performing a full system scan, but in our tests, several false positives were identified, meaning that ClamAV identified innocent files as containing viruses. Because of this, it s best to use ClamAV to scan just your personal files for viruses, which is to say, those within your /home directory. Bear in mind that this is where all files you import to your computer will likely to be installed, so this is where an infection is most likely to be found. To scan your personal files, follow these instructions:
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1. Start ClamTk by clicking Applications System Tools Virus Scanner. 2. Before starting the scan, it s useful to ensure hidden files are scanned. After all, a
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virus is likely to try to hide, rather than make its presence obvious! This can be done by clicking Options Scan Hidden Files (.*).
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Note Resist the temptation at this stage to select Delete Infected Files from the Options menu. This is
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because ClamTk might return a false positive a file that it thinks contains a virus but that is actually perfectly safe. It s better to deal with viruses after they ve been found on a one-by-one basis, rather than automatically.
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3. Although there s a button on the toolbar that lets you scan your /home directory with a
single click, it won t scan recursively. That means it won t scan any folders (or folders of folders) within your /home directory, so it isn t of much use. To perform a recursive scan of your /home directory, click File Recursive Scan. Then click the OK button in the Select a Directory (Recursive Scan) dialog box. This will select your /home directory. Of course, you can also select any other folders to scan at this stage.
4. The scan will start. Depending on the quantity of files in your /home directory and
their sizes, it may take some time. You ll see a live status report beneath the toolbar, showing which file is currently being scanned. When the status line reads Scanning Complete, the scan has finished. Running along the bottom of the window will be a complete status report, showing the number of files scanned and the number of viruses found, if any. See Figure 9-22 for an example. If any viruses are found, move on to the next section.
CHAPTER 9 HOW TO SEC URE Y OUR COMPUTE R
Figure 9-22. You ll see a live status report detailing which files are being scanned below the toolbar in the ClamTk program window.
Dealing with Infections
If any viruses are found, they will be listed in the ClamTk program window. The type of virus that s allegedly infecting the file will be listed in the Status column. See Figure 9-23 for an example.
Figure 9-23. If ClamTk finds a virus, it will be listed in the main program window. Look in the Status column for the name of the virus.
CHAPTER 9 HOW TO SEC URE Y OUR COMPUTE R
Be aware that ClamTk sometimes reports a virus when it simply can t access a particular file, perhaps because of file permission problems. If this is the case, you ll see Access Denied or Can t Open Directory in the Status column. You can ignore these files.
Tip If you really want to scan files that require superuser permissions, you can run ScanTk with superuser
powers. Open a terminal window (Applications Accessories Terminal), and type gksu scantk.
Entries in the list can be right-clicked and quarantined or deleted. Quarantining is where the file is moved to a special directory for inspection or deletion later on. You can manage quarantined files using the Quarantine Maintenance menu. While the impulse might be to simply delete the file, you should be cautious. Be aware that ClamTk might be reporting a false positive a file that it thinks is infected with a virus, but which isn t. This is rare but can happen. If you do find a file you know is a false positive, right-click it and select Quarantine. Then click Quarantine Maintenance. In the list, select the file and click False Positive. This will ensure it s ignored next time you scan. So what should you do if you find a file is infected First, don t panic. Remember that practically all viruses that ClamAV is likely to find are targeted at Windows systems and don t affect Linux.
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