Re: .exe

[tarik shalo <tarikshalo () gmail com>]

On Tue, May 7, 2013 at 9:11 AM, tarik shalo <tarikshalo () gmail com> wrote:

> Hi,
>
> I have added also the "-k none" when i started Snort and I didn't see any
> difference. It started normally, "commencing packet processing".
>
> -Thanks
>
>
>
> On Mon, May 6, 2013 at 11:42 PM, Joel Esler <jesler () sourcefire com> wrote:
>
> > Try adding -k none to your snort startup line.
> >
> > On May 6, 2013, at 4:27 PM, tarik shalo <tarikshalo () gmail com> wrote:
> >
> > Hi,
> >
> > Yes, it alerts on ICMP traffic at least.
> >
> > Thanks
> >
> > -Shalo
> >
> > On Mon, May 6, 2013 at 11:01 PM, Joel Esler <jesler () sourcefire com>wrote:
> >
> > > Sounds like a configuration problem then.  Verify that you can alert on
> > > the simplest traffic first.
> > >
> > > Try adding -k none to your snort startup line.
> > >
> > >
> > > On May 6, 2013, at 3:52 PM, tarik shalo <tarikshalo () gmail com> wrote:
> > >
> > > Hi,
> > >
> > > I found the rule (15306) in "file-identify.rules" and removed the
> > > "flowbits:set, file.exe" from the rule so as to match ur rule suggestion
> > > (the following). Then I tried to download "winscp514setup.exe" from a
> > > remote http server on the machine where Snort was running. But the rule
> > > doesn't fire still :(
> > >
> > > -Shalo
> > >
> > > On Mon, May 6, 2013 at 9:22 PM, Joel Esler <jesler () sourcefire com>wrote:
> > >
> > > > 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 <tarikshalo () gmail 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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