RE: what should I do when....

["Sergio Castro" <sergio.castro () unicin net>]

What Internet cops should I call to defend me from Chinese hackers Philipe?
Because just last night my 1025 and 1026 ports where getting scanned from a
Chinese IP address.

"Bullet-proofing" your systems is as easy as using a firewall. If you know
what you are doing, you have nothing to fear from port scans and brute force
attacks. The only true danger would be a DDOS, but unless you are a high
profile website, such an attack is unlikely to happen. If you DO have a high
profile website, there are precautions you can take against DDOS too.

Jorge, you may want to check out the Internet Storm Center, where you can
see just how common port scans are: http://isc.sans.org/top10.html

Regards,

- Sergio

-----Mensaje original-----
De: Rivest, Philippe [mailto:PRivest () transforce ca] 
Enviado el: Lunes, 07 de Julio de 2008 01:16 p.m.
Para: Sergio Castro; Jorge L. Vazquez; security-basics;
security-basics-sc.1207759308.halobnafecliebdpegpn-Jlvazquez825=gmail.com@se
curityfocus.com; security focus listbounce
Asunto: RE: what should I do when....

Not everyone is BULLET PROOF :)

If your house has metal doors and your windows have steal frame behind. If
you see a potential a strange looking men in a cars in front of your house
at 2am with a flash light knowning his been there for 3hrs.

Do you think you should call the cops are you will estimate that they are
too lazy and just take a chance that you have locked all your doors and
windows?

I do think I would call and take a bat in my hands. Do the same with your
systems! They are ur babies after all :)

Merci / Thanks
Philippe Rivest, CEH
Vérificateur interne en sécurité de l'information
Courriel: Privest () transforce ca
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 : Sergio Castro [mailto:sergio.castro () unicin net] Envoyé : 7 juillet 2008
14:04 À : Rivest, Philippe; 'Jorge L. Vazquez'; 'security-basics';
security-basics-sc.1207759308.halobnafecliebdpegpn-Jlvazquez825=gmail.com@se
c
urityfocus.com; 'security focus listbounce'
Objet : RE: what should I do when....

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 () transforce ca] 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.com@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 () transforce ca
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 () securityfocus com [mailto:listbounce () securityfocus com] 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.com@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 () securityfocus com [mailto:listbounce () securityfocus com] 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.com@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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