From: Joel Esler (jeslersourcefire.com)
Date: Mon May 06 2013 - 13:22:58 CDT

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Try this rule:

alert tcp $EXTERNAL_NET $FILE_DATA_PORTS -> $HOME_NET any (msg:"FILE-EXECUTABLE Portable Executable binary file magic detected"; flow:to_client,established; file_data; content:"MZ"; byte_jump:4,58,relative,little; content:"PE|00 00|"; within:4; distance:-64; metadata:service http, service imap, service pop3; classtype:policy-violation; sid:15306; rev:17;)

On May 6, 2013, at 7:59 AM, tarik shalo <tarikshalogmail.com> wrote:

>
> Hi,
>
> I edited the rule based on ur comment, "Try flow:from_server,established; and instead of the string ".exe" try content:"|4d 5a|"; which is equivalent to the text string "MZ" found at the beginning of most PE files."
>
> But the rule didn't fire. Are there some executables that i can use to test for which there are corresponding Snort rules that catch them?
>
> -Thanks again guys for the help and lessons that i am learning from your responses.
>
> Shalo
>
>
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