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https://bro-tracker.atlassian.net/browse/BIT-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18303#comment-18303
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Brian O'Berry commented on BIT-1238:
------------------------------------
I guess more likely, any regular text file containing lines padded with at
least 24 spaces after the 100th character will match, including a line of at
least 124 spaces. Or, lines padded with spaces followed by digits in the case
of left-justified descriptions followed by right-justified integers. Point
being this pattern seems likely to match many text files, period, not just
those in our environment.
> High false-positive for application/x-tar signature
> ---------------------------------------------------
>
> Key: BIT-1238
> URL: https://bro-tracker.atlassian.net/browse/BIT-1238
> Project: Bro Issue Tracker
> Issue Type: Problem
> Components: Bro
> Affects Versions: 2.3
> Reporter: Brian O'Berry
> Labels: file, mime, signature
>
> The following signature in base/frameworks/files/magic/general.sig frequently
> triggers on text files in our environment, and includes a strength value
> higher than GNU and POSIX tar signatures in libmagic.sig.
> {code}
> signature file-tar {
> file-magic /([[:print:]\x00]){100}(([[:digit:]\x00\x20]){8}){3}/
> file-mime "application/x-tar", 150
> }
> {code}
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