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Decompression bomb

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#1 pmaccr


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Posted 05 August 2011 - 10:21 PM

Window defender found it , I dont know if it needs removed but it wont let me remove it?

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#2 Broni


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Posted 05 August 2011 - 10:32 PM

A decompression bomb is a file (usually compressed) that unpacks to an enormous amount of data - thus "flooding" the unpacking engine.
Not necessary malicious.
What is the name of that file?

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#3 boopme


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Posted 05 August 2011 - 10:35 PM

A decompression bomb is a highly compressed archive of a large amount of uncompressed data. In other words, it is a file that looks small as a result of multiple compression methods but is actually very large when decompressed. Such files could potentially crash a system when unpacked and in the past they were known for targeting anti-virus programs during scanning. Your anti-virus will not attempt to scan/unpack the file but will alert you to the high compression ratio which it considers suspicious.

This is a common issue for avast anti-virus users.

Generally, there is not need to be worried about. Decompression bomb is just something that unpacks to an unusually big amount of data even though it's rather small (i.e. has a high compression ratio, for example). It's nothing to worry about, you are just informed that avast! will not try to unpack the archive (you may not even know that it's an archive, but it seems like it is) because it may take VERY long to process...I'd suggest to ignore these files.
But you can change values into avast4.ini file to configure how avast should work with these files.

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