Internet Security

Scan of compound files

A common method of concealing viruses is to embed them into compound files: archives, databases, etc. To detect viruses that are hidden in this way a compound file should be unpacked, which can significantly lower the scan speed.

For each type of compound file, you can select to scan either all files or only new ones. To make your selection, click the link next to the name of the object. It changes its value when you left-click on it. If you select the scan new and changed files only mode, you will not be able to select the links allowing you to scan all or new only files.

By default, Kaspersky Internet Security scans only embedded OLE objects.

When large compound files are scanned, their preliminary unpacking may take a long period of time. This period can be reduced by enabling unpacking of compound files in background mode if they exceed the specified file size. If a malicious object is detected while working with such a file, the application will notify you about it.

You can restrict the maximum size of the compound file being scanned. Compound files larger than the specified value will not be scanned.

When large files are extracted from archives, they will be scanned even if the  Do not unpack large compound files box is checked.

To modify the list of scanned compound files:

1. Open the application settings window.
2. In the left part of the window, in the Protection Center section, select the File Anti-Virus component.
3. Click the Settings button in the Security level section in the right part of the window.
4. In the window that opens, on the Performance tab, in the Scan of compound files section, select the required type of compound files to be scanned.

In order to set the maximum size of compound files to be scanned:

1. Open the application settings window.
2. In the left part of the window, in the Protection Center section, select the File Anti-Virus component.
3. Click the Settings button in the Security level section in the right part of the window.
4. In the window that opens, on the Performance tab, in the Scan of compound files section, click the Additional button.
5. In the Compound files window, check the  Do not unpack large compound files box and specify the maximum file size.

To unpack large-sized compound files in background mode:

1. Open the application settings window.
2. In the left part of the window, in the Protection Center section, select the File Anti-Virus component.
3. Click the Settings button in the Security level section in the right part of the window.
4. In the window that opens, on the Performance tab, in the Scan of compound files section, click the Additional button.
5. In the Compound files window, check the  Extract compound files in the background box and specify the minimum file size.