[Snort-sigs] New sig for detecting possible Hancitor maldoc bypass via PNG

Joshua Williams joshuwi2 at ...435...
Mon Nov 7 10:39:00 EST 2016


rmkml,

Thanks for your submission. I'll review and test this rule and get back to
you when it's finished.

--
Josh Williams
Detection Response Team
TALOS Security Group

On Sun, Nov 6, 2016 at 3:11 PM, rmkml <rmkml at ...4129...> wrote:

> Hi,
>
> First, Thx @didierstevens and @sans_isc,
>
> Please check a new sig for detecting possible Hancitor maldoc bypass via
> PNG:
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT
> possible Hancitor maldoc bypass via PNG image attempt";
> flow:to_client,established; file_data; content:"|89|PNG|0D 0A 1A 0A|";
> within:8; distance:0; content:"|00 00 00 00|IEND"; distance:0;
> content:"STARFALL"; fast_pattern; within:12; distance:0; reference:url,
> isc.sans.edu/forums/diary/Hancitor+Maldoc+Bypasses+Application+
> Whitelisting/21683/;
> classtype:attempted-user; sid:1; rev:1;)
>
> Don't forget check variables.
>
> Please send any comments.
>
> Regards
> @Rmkml
>
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