If you find entries in your webservers weblog like these:
srv08.edv-sklave.de - - [02/Jan/2010:15:31:53 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:54 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:54 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:55 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:55 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:52 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:55 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:58 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:58 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:58 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:00 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:57 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:48 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:00 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:58 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:01 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:58 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:00 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:57 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:02 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:59 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:32:02 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
srv08.edv-sklave.de - - [02/Jan/2010:15:31:56 +0100] "GET /index.php?reason=netsecdb_is_visiting_back_hacker_source_and_notifying_its_admin_the_direct_way HTTP/1.0" 200 17428 "-" "ApacheBench/2.0.40-dev"
Every of these requests is send out with a HEADER:
'www.netsecdb.de - visits back hackers origin - see http://www.netsecdb.de/index.php?q=node/595'
Your server is either a torexit node, open proxy or in another way was misused to exploit-attack www.netsecdb.de.

Copyright © 2008-2010 Claus Marxmeier EDV-Service
Alle Rechte vorbehalten. Insbesondere dürfen Nachdruck, Aufnahme in Online-Dienste und Internet und Vervielfältigung auf Datenträger
wie CD-ROM, DVD-ROM etc. nur nach vorheriger schriftlicher Zustimmung erfolgen.
Die Anbieter haften nicht für unverlangt eingesandte Manuskripte und Fotos.
Designed by Claus Marxmeier.
