Hi,
I appreciate your patience on this and thank you, I changed the level on
msauth_rules.xml and the alerts are working fine , but I have one issue here,
which is If I set the frequency and timeframe on the same file for the rule
,and OSSEC fails to start. All Im trying to do is change both frequency and
level of a rule and get the OSSEC started.
Below is the Change I made in msauth_rules.xml which makes OSSEC fail to start:
<rule id="18105" level="12" frequency="3" timeframe="120" >
<if_sid>18100</if_sid>
<status>^AUDIT_FAILURE|^failure</status>
<description>Windows audit failure event.</description>
</rule>
However If I remove : frequency="3" timeframe="120" and enter the below it
works fine:
<rule id="18105" level="12">
<if_sid>18100</if_sid>
<status>^AUDIT_FAILURE|^failure</status>
<description>Windows audit failure event.</description>
</rule>
Regards,
Khoshal AR
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of dan (ddp)
Sent: Monday, February 02, 2015 8:54 PM
To: [email protected]
Subject: Re: [ossec-list] overwrite rules from Local_rules.xml does not work
On Mon, Feb 2, 2015 at 10:16 AM, dan (ddp) <[email protected]> wrote:
> On Mon, Feb 2, 2015 at 10:12 AM, Khoshal A R.
> <[email protected]> wrote:
>> Hi,
>>
>> No Please, I meant I ended up goin to some blog online and I tried that
>> solution, not on the OSSEC documentation, definitely not.
>>
>> Can you please help on noticing where I'm going wrong on the below
>> configuration.
>>
>
>
> Besides that I already pointed out? Try changing the level for the
> rule that's being triggered, if that's your final goal.
>
If you're trying to modify the level of the alert that you posted, try this:
<rule id="18138" level="12" overwrite="yes">
<if_sid>18106</if_sid>
<id>^539$|^4625$</id>
<description>Logon Failure - Account locked out.</description>
<group>win_authentication_failed,</group>
</rule>
>> Regards,
>> Khoshal AR
>>
>>
>>
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]] On
>> Behalf Of dan (ddp)
>> Sent: Monday, February 02, 2015 8:36 PM
>> To: [email protected]
>> Subject: Re: [ossec-list] overwrite rules from Local_rules.xml does not work
>>
>> On Mon, Feb 2, 2015 at 9:59 AM, Khoshal A R.
>> <[email protected]> wrote:
>>> Hi,
>>>
>>> I tried without changing the rule_id , but somewhere in the on the online
>>> docs I got this idea to use the new rule ID, however now as you mentioned I
>>> ve reverted back and to narrow the issue I m pasting the config entry in
>>> local_rules.xml and the corresponding output from
>>> /var/ossec/logs/alerts/alerts.log
>>>
>>
>> If you figure out what part of the documentation gave you that idea,
>> let me know and I'll try to make it more clear.
>>
>>> This is the entry in local_rules.xml:
>>>
>>> <rule id="18106" level="13" overwrite="yes">
>>> <if_sid>18105</if_sid>
>>>
>>> <id>^529$|^530$|^531$|^532$|^533$|^534$|^535$|^536$|^537$|^539$|^4625$</id>
>>> <description>Windows Logon Failure.</description>
>>> <group>win_authentication_failed,</group>
>>> </rule>
>>>
>>> Then I tried with the invalid password to one of our windows agent and here
>>> is the output from alerts.log
>>>
>>> ** Alert 1422888616.112065949: - windows,win_authentication_failed,
>>> 2015 Feb 02 14:50:16 (RZP_NA_PROD_RDP01) 10.0.0.6->WinEvtLog
>>> Rule: 18138 (level 7) -> 'Logon Failure - Account locked out.'
>>
>> The rule you modified is 18106, this log message triggers 18138. I
>> don't see anything in 18138 that would be affected by the change in
>> 18106. I'm not very confused as to what you're trying to do, because
>> this doesn't really make much sense.
>>
>>> User: (no user)
>>> 2015 Feb 02 09:50:05 WinEvtLog: Security: AUDIT_FAILURE(4625):
>>> Microsoft-Windows-Security-Auditing: (no user): no domain: RZPPROD-RDP01:
>>> An account failed to log on. Subject: Security ID: S-1-0-0 Account Name:
>>> - Account Domain: - Logon ID: 0x0 Logon Type: 3 Account For Which
>>> Logon Failed: Security ID: S-1-0-0 Account Name: khoshalk Account
>>> Domain: RZPPROD-RDP01 Failure Information: Failure Reason: %%2313
>>> Status: 0xc000006d Sub Status: 0xc0000064 Process Information: Caller
>>> Process ID: 0x0 Caller Process Name: - Network Information: Workstation
>>> Name: BG1NB189 Source Network Address: - Source Port: - Detailed
>>> Authentication Information: Logon Process: NtLmSsp Authentication
>>> Package: NTLM Transited Services: - Package Name (NTLM only): - Key
>>> Length: 0 This event is generated when a logon request fails. It is
>>> generated on the computer where access was attempted.
>>>
>>> Email alert level is set to 12 in ossec.conf and I ve restarted OSSEC after
>>> I added to the local_rules.xml.
>>>
>>> Can you please figure out where exactly Im going wrong with this,
>>>
>>> Regards,
>>> Khoshal AR
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: [email protected] [mailto:[email protected]] On
>>> Behalf Of dan (ddp)
>>> Sent: Monday, February 02, 2015 8:03 PM
>>> To: [email protected]
>>> Subject: Re: [ossec-list] overwrite rules from Local_rules.xml does not work
>>>
>>> On Mon, Feb 2, 2015 at 9:24 AM, Khoshal A R.
>>> <[email protected]> wrote:
>>>> Hi,
>>>> Thanx for quick response.
>>>>
>>>> These entries are not commented in local_rules.xml, here is one sample
>>>> rule I am trying to modify the severity,
>>>>
>>>> <rule id="100111" level="13" overwrite="yes">
>>>
>>> I don't have a 100111, can you provide your original rule with id 100111?
>>> Or, are you misunderstanding the overwrite option? You should use
>>> overwrite when there is a rule in the *_rules.xml files that come with
>>> OSSEC that you want to modify. If you are creating a new rule, you
>>> should not be using the overwrite option.
>>> For example, if you wanted to change the level of rule 18105, you could use:
>>>
>>> <rule id="18105" level="12" overwrite="yes">
>>> <if_sid>18100</if_sid>
>>> <status>^AUDIT_FAILURE|^failure</status>
>>> <description>Windows audit failure event.</description>
>>> </rule>
>>>
>>> Notice how the "rule id" does not change, only the level and the
>>> addition of the overwrite option.
>>>
>>>> <if_sid>18105,18106,18116</if_sid>
>>>> <match>illegal user|invalid user</match>
>>>> <description>Attempt to login using a non-existent user</description>
>>>> <group>invalid_login,authentication_failed,</group>
>>>> </rule>
>>>>
>>>> Also , I am restarting OSSEC after every little change in the config
>>>> files.If I set the mail alert to less than 12 I get the alerts correctly
>>>> but as there are too many events Im flooded with mails hence I'm trying to
>>>> increase the severity of few events like the one above mentioned.
>>>>
>>>> I'm also checking the /var/ossec/logs/alerts/alerts.log after I made the
>>>> entry in local_rules.xml and restarted OSSEC, but alerts.log still gives
>>>> the rule number in the msauth_rules.xml and not the rule number on
>>>> local_rules.xml,
>>>>
>>>> Please let me know if you need more info,
>>>>
>>>> Regards,
>>>> Khoshal AR
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: [email protected] [mailto:[email protected]] On
>>>> Behalf Of dan (ddp)
>>>> Sent: Monday, February 02, 2015 7:31 PM
>>>> To: [email protected]
>>>> Subject: Re: [ossec-list] overwrite rules from Local_rules.xml does not
>>>> work
>>>>
>>>> On Mon, Feb 2, 2015 at 8:57 AM, Khoshal A R.
>>>> <[email protected]> wrote:
>>>>> Hi,
>>>>>
>>>>> Can you please help me in what I m doing wrong in modifying the severity
>>>>> of
>>>>> the rules that I m trying in local_rules.xml.
>>>>>
>>>>> OS : Kali-Linux
>>>>>
>>>>> OSSEC version : 2.8.1
>>>>>
>>>>>
>>>>>
>>>>> Please find the local_rules.xml file entries below for the overwrite:
>>>>>
>>>>> Everything else works , but I need to change the severity of certain rules
>>>>> for the meaningful alerts and fine tune the frequency they are executed.
>>>>>
>>>>> Appreciate your help.
>>>>>
>>>>
>>>> Are all of these rules commented out in the local_rules.xml file as well?
>>>> Did you restart the OSSEC processes after making the changes?
>>>> Do you have log samples that can be tested with ossec-logtest?
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> <rule id="100102" level="12" overwrite="yes">
>>>>>
>>>>> <if_sid>18104</if_sid>
>>>>>
>>>>> <id>^513$|^4609$</id>
>>>>>
>>>>> <description>Windows is shutting down.</description>
>>>>>
>>>>> <group>system_shutdown,</group>
>>>>>
>>>>> </rule>
>>>>>
>>>>> -->
>>>>>
>>>>>
>>>>>
>>>>> <!--
>>>>>
>>>>> <rule id="100103" level="13" overwrite="yes">
>>>>>
>>>>> <if_sid>18103</if_sid>
>>>>>
>>>>> <id>^13570$</id>
>>>>>
>>>>> <description>Windows file system full.</description>
>>>>>
>>>>> <group>low_diskspace,</group>
>>>>>
>>>>> </rule>
>>>>>
>>>>> -->
>>>>>
>>>>>
>>>>>
>>>>> <!--
>>>>>
>>>>> <rule id="100104" level="12" overwrite="yes">
>>>>>
>>>>> <if_sid>18100,18103</if_sid>
>>>>>
>>>>> <status>^ERROR</status>
>>>>>
>>>>> <description>Windows error event.</description>
>>>>>
>>>>> <group>system_error,</group>
>>>>>
>>>>> </rule>
>>>>>
>>>>> -->
>>>>>
>>>>>
>>>>>
>>>>> <!--
>>>>>
>>>>> <rule id="100105" level="12" overwrite="yes">
>>>>>
>>>>> <if_sid>18100,18105</if_sid>
>>>>>
>>>>> <status>^AUDIT_FAILURE|^failure</status>
>>>>>
>>>>> <description>Windows audit failure event.</description>
>>>>>
>>>>> </rule>
>>>>>
>>>>> -->
>>>>>
>>>>>
>>>>>
>>>>> </group> <!-- SYSLOG,LOCAL -->
>>>>>
>>>>>
>>>>>
>>>>> Regards,
>>>>>
>>>>> Khoshal AR
>>>>>
>>>>> Sonata Software Limited
>>>>>
>>>>>
>>>>>
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