Re: alert vs drop

[Y M via Snort-users <snort-users () lists snort org>]

Typically, the ExtraData should come after the event itself. Is the output cut somewhere or writes were blocked to the 
u2 file? I haven't seen this one before.

Thanks
YM

________________________________
From: Snort-users <snort-users-bounces () lists snort org> on behalf of Андрей Пегов via Snort-users <snort-users () 
lists snort org>
Sent: Monday, April 16, 2018 11:35 AM
To: snort-users () lists snort org
Subject: [Snort-users] alert vs drop

Hi

snort 2.9.9.0

snort.conf:

ruletype test
{
type drop
output alert_unified2: filename snort-unified.alert, limit 1
output log_null
}

rule:

test tcp any any -> any any (file_data; msg:"secret"; content:"topsecret"; nocase; sid:10000010;)

u2spewfoo:

(Event)
sensor id: 0 event id: 1 event second: 1523876791 event microsecond: 132288
sig id: 10000010 gen id: 1 revision: 0 classification: 0
priority: 0 ip source: 192.168.0.2 ip destination: 192.168.1.2
src port: 80 dest port: 56700 protocol: 6 impact_flag: 32 blocked: 1

snort.conf:

ruletype test
{
type alert
output alert_unified2: filename snort-unified.alert, limit 1
output log_null
}

u2spewfoo:

(ExtraDataHdr)
event type: 4 event length: 33
(ExtraData)
sensor id: 0 event id: 1 event second: 1523876957
type: 9 datatype: 1 bloblength: 9 HTTP URI: /
(ExtraDataHdr)
event type: 4 event length: 43
(ExtraData)
sensor id: 0 event id: 1 event second: 1523876957
type: 10 datatype: 1 bloblength: 19 HTTP Hostname: 192.168.0.2


snort does not write an alarm event to unified2 ?

Andrey

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