If your ports are properly stealthed, and you have scanned your systems and
have no vulnerabilities, you have little to fear from scans.

Now, if your ISP pays attention to you and fights for you and does something
about all those scans coming from China, good for you. You have a really
good ISP.

Regards,

Sergio

-----Mensaje original-----
De: Rivest, Philippe [mailto:PRivest (at) transforce (dot) ca [email concealed]]
Enviado el: Lunes, 07 de Julio de 2008 12:53 p.m.
Para: Sergio Castro; Jorge L. Vazquez; security-basics;
security-basics-sc.1207759308.halobnafecliebdpegpn-Jlvazquez825=gmail.co
m@se
curityfocus.com; security focus listbounce
Asunto: RE: what should I do when....

This is not a good practice.
If you just tolerate brute forcing and scanning you are on the wrong track.
Imagine if the network usage would double or triple because of these
behavior. When will you start to report this to your ISP? When will you
start to pressure them that they have clients that need & WANT a secure
service (ISP)?

As I stated, you should follow your internal procedure, hardened you device
after your investigation (&before also..) and contact your ISP.

When you have a contract with your ISP you should have a contact for
*emergency*. Contact him or normal enterprise service level and have them
take a look at the situation.

Not doing anything is just accepting that you can be probe and that's not
very wise.

**Also note that if the guy whos probing you knows nobody ever contacts the
ISP for investigation.. do you really think his gonna do nice and limited
(rate) scans? His gonna pop everything he has against you to do a full &
extensive & complet scan.

Merci / Thanks
Philippe Rivest, CEH
Vérificateur interne en sécurité de l'information
Courriel: Privest (at) transforce (dot) ca [email concealed]
Téléphone: (514) 331-4417
www.transforce.ca

Vous pourriez imprimer ce courriel, mais faire pousser un arbre c'est long.
You could print this email, but it does takes a long time to grow trees.

-----Message d'origine-----
De : listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] De
la part de Sergio Castro Envoyé : 4 juillet 2008 19:51 À : 'Jorge L.
Vazquez'; 'security-basics';
security-basics-sc.1207759308.halobnafecliebdpegpn-Jlvazquez825=gmail.co
m@se
c
urityfocus.com; 'security focus listbounce'
Objet : RE: what should I do when....

Hi Jorge,

My recommendation, other than make sure your public IP systems are properly
hardened, is to do nothing. Continuous scans and brute force login attempts
are the norm on the Internet. For every ISP that pays attention to your
complaints, 10 will ignore you.

- Sergio

-----Mensaje original-----
De: listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] En
nombre de Jorge L. Vazquez Enviado el: Jueves, 03 de Julio de 2008 09:05
p.m.
Para: security-basics;
security-basics-sc.1207759308.halobnafecliebdpegpn-Jlvazquez825=gmail.co
m@se
curityfocus.com; security focus listbounce
Asunto: what should I do when....

for the last 2 days I've been getting lots of connections attempts on my
firewall logs(ipcop firewall), from a specific ip based in Canada, the log
is showing a
*
*
NEW not SYN?

it seems that someone is trying to initiate a connections, or may be a scan.
Although the good thing is that the firewall is detecting them therefore
stopping them, I'm getting worried of hacker activity, I've already done ip
lookup, and dns whois query both of those point to ip and host in Canada it
seems to be a company as I got their public website and also private
network.....could anyone advice me what's the proper course of actions in
this case?....

thanks
Jorge L. Vazquez
www.pctechtips.org

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