Hi there,
I've recently deployed a passive Snort sniffer next a bunch of
webservers, and I'm getting quite a lot of "WEB-CLIENT Excel malformed
FBI record" reports. I can't quite figure out if it's false positives or
not.
I've configured the IP's of the webservers as $HOME_NET, but when I look in
"rules/web-client.rules"
it states
"alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any"
which I read as the $HOME_NET is the destination, BUT when I read the
Snort syslog message below, it looks like the "attack" originates from
my webserver. Is that a correct assumption?
(Timestamp and IPs have been changed to protect the innocent! :-)
Jul 7 13:37:00 sysloghost snort: [1:12256:1] WEB-CLIENT Excel malformed
FBI record [Classification: Attempted User Privilege Gain] [Priority:
1]: {TCP} 10.1.1.1:80 -> 10.2.2.2:1229
10.1.1.1 is the webserver
10.2.2.2 is some client
Can any of you guys enlighten me?
--
Jesper S. Jensen
Basisnet og Sikkerhed
Uni-C - Århus, Danmark
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