On Wednesday, November 25, 2015 at 1:46:15 PM UTC-5, LostInThe Tubez wrote:
>
> On the OSSEC server, open /var/ossec/rules/syslog_rules.xml. Search for
> rule 1002, right there towards the top. Note the options element, which
> contains alert_by_email. That option tells OSSEC to ignore your
> email_alert_level and just send an email every time this rule matches. As
> you have seen, rule 1002 is a catch-all heuristics rule that attempts to
> identify problems in logs based on certain keywords.
>
>
>
Thank you, that explains why level 2 alerts are generating the emails for
the "BAD_WORDS". I was under the impression that the default level of 7 was
for all types of rules, but that is clear now.
I'm now left with the feeling of that is the main cause of these alerts
coming in, even though I have the filters in local_rules.xml, level 2
alerts are still coming in. Even when logtest shows that it should stop.
Here is another simple example of a local_rule working for logtest, but
still generating email alerts .
/var/ossec/rules/local_rules.xml
<rule id="100010" level="0">
<program_name>accelerator</program_name>
<regex>Update peer failed with code 22</regex>
<description>Ignore Expand Warnings</description>
</rule>
/var/ossec/bin/ossec-logtest
2015/11/25 19:15:23 ossec-testrule: INFO: Reading local decoder file.
2015/11/25 19:15:24 ossec-testrule: INFO: Started (pid: 6713).
ossec-testrule: Type one log per line.
Nov 25 19:11:45 x.x.x.x accelerator[4124]: Update peer failed with code
22.
**Phase 1: Completed pre-decoding.
full event: 'Nov 25 19:11:45 x.x.x.x accelerator[4124]: Update
peer failed with code 22.'
hostname: 'x.x.x.x'
program_name: 'accelerator'
log: ' Update peer failed with code 22.'
**Phase 2: Completed decoding.
No decoder matched.
**Phase 3: Completed filtering (rules).
Rule id: '100010'
Level: '0'
Description: 'Ignore Expand Warnings'
So, even though logtest shows it will be a Level: '0', I still get an email
alert as:
Rule: 1002 fired (level 2) -> "Unknown problem somewhere in the system."
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