[Snort-sigs] Offer sig for detect Malformed RTF document

Tyler Montier tmontier at ...435...
Thu Mar 23 19:01:50 EDT 2017


@rmkml,

Thanks for your submission. We will review and test the rule and get back
to you when its finished.

Sincerely,

Tyler Montier
Cisco Talos

On Thu, Mar 23, 2017 at 4:09 PM, rmkml <rmkml at ...4129...> wrote:

> Hello,
>
> First, thx @r00tbsd and Talos,
>
> Please check sig for detecting Malformed RTF document:
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-RTF
> Malformed RTF with PNG header attempt"; flow:to_client,established;
> file_data;
> content:"{|5c|rt"; within:4; distance:0; content:"PNG|0d 0a|";
> within:5;distance:1;
> reference:url,blog.talosintelligence.com/2017/03/
> how-malformed-rtf-defeats-security.html;
> classtype:attempted-user; sid:1; rev:1;)
>
> Please send any comments.
>
> Best Regards
> @Rmkml
>
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