viruse in the installation file

Toshiba Canvio e05a100pbu2xk hard drive...
October 1, 2010 at 08:21:39
Specs: Windows XP, 2.5/2
Can an extraction file i mean a file that installs applications can it be scaned by an antiviruse?
because when i scaned the extraction file the file that installs applications the antiviruse didnt show me any viruses but the funny thing is that when i was installing a file it told me that there wasa threat or as we can say a viruse hows that possible help i really need a answer

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October 1, 2010 at 08:38:38
Good virus scanners can and do scan installer files. But they are only able to do this with installers it knows about and is able to extract the files. In the case of custom or rarely used installers this will not be possible and a virus could slip by.

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October 1, 2010 at 08:44:20

Many installation files are simply an installation program wrapped around a compressed file containing all the individual application files. Most anti-virus software can not only scan the installation file, but also each individual file compressed within the installtion program -- ...UNLESS, that feature is missing from your anti-virus software or the feature (to scan within compressed files) is disabled.

It sounds like the latter might be the case. If your anti-virus doesn't scan the contents of compressed files, it wouldn't "see" an infected file until it was de-compressed during installion.

To fix this, you need to enable scanning within compressed files, or if your anti-virus software doesn't support this feature (some free anti-virus softwares don't do this), replace it with one that does.

-- kptech

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