Dear all,
I worked on MHN Honeypot and now I am able to log IP in a specific log file
and by using OSSEC and active respons ALL my servers are able to ban IPs
coming on the honeypot (for MHN script I wrote
:
https://groups.google.com/d/msg/modern-honey-network/szahW2nS2UM/oQTmlaXbyTEJ).
So everything is working fine, but I want to improve it a little bit before
sharing a kind of how to on this.... and so I need your light ! :
On OSSEC server I created this decoder and rules :
*DECODER :*
<decoder name="mhn">
<program_name>MHN</program_name>
<!-- <prematch>^MHN: New attack from </prematch>
<regex offset="after_prematch">SRC=(\S+) </regex>
<order>srcip</order>-->
<regex>from SRC=(\d+.\d+.\d+.\d+)</regex>
<order>srcip</order>
</decoder>
*RULES :*
<rule id="100010" level="3">
<decoded_as>mhn</decoded_as>
<description>Parent rule for MHN detection and action</description>
</rule>
<rule id="100011" level="3" frequency="1" timeframe="3600" ignore="3600">
<if_matched_sid>100010</if_matched_sid>
<description>This IP has been banned for some time...</description>
</rule>
*And OSSEC.CONF :*
<active-response>
<command>host-deny</command>
<location>defined-agent</location>
<agent_id>xxx</agent_id>
<rules_id>100011</rules_id>
<timeout>3600</timeout>
</active-response>
As you can see this is not perfect as I'm not sure I need 100011 for
example !
Anyway, the idea is to :
1°) Alert immediatly all my agents (except the Honeypot) about a new
attack, and add the IP in hosts.deny for X hours. Then during X hours don't
alert the agents.
2°) If an attack comes from an IP for the second time (after the X delay)
ban the IP for Y hours (Y > X !)
3°) if an attack comes from an IP for the third time (after Y delay) ban
the IP for Z hours or day(s)
Is that possible ???
Many thanks for any idea or suggestion...
All the best
Thomas
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