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It's not a big problem in this case, however - the "decompression bomb" announcement actually means something like "The file has a very high, maybe even suspicious, compression ratio and the AV is not going to scan the archive content".īut you can change values into avast4.ini file to configure how avast should work with these files.Ĭlick 'Settings' in my signature for more info ) This kind of files is rather hard to detect (and avoid) precisely - so, it is possible that there are some false alarms. Such file are not malicious per se, but they may block an antivirus program when it tries to scan them. The reason it couldn't be moved to the chest is likely to be the file size is too large.ĭecompression bomb is a file that may be rather small, but decompresses to an enormous amount of data (when processed as a packed archive).
If you cannot delete it using Windows explorer, post back, let us know.
It's in a temp folder, so should be safe to delete within a day or two. It is simply a file with an unusually high compression ratio or routine.Ĭhances are it is not infected, just unable to be scanned because of the compression of it. I have see posts here that the most dangerous thing about a "decompression bomb" is the terminology. (Possibly someone else can help any further.) Its just a file which is highly compressed. i found the file in the temp folder, but i can't do anything with it there either.įile is c:\windows\temp\_avast4_\unp187064927.tmp\Ī decompression bomb isn't necessarily bad. i tried to move to chest and tried to delete file and it says there was an error. After running avast scan, it showed a file that could not be scanned because it was a decompression bomb.