Hi Craig,
did you try to use the new decoders?. I think it could be work.
Steps:
- Create a backup of your decoder.xml
- Replace "windows decoder" copying from line 174 to 417 of this file
(https://github.com/wazuh/ossec-rules/blob/master/rules-decoders/ossec/decoders/windows_decoders.xml#L174)
- Restart ossec
Let me know if it works.
On Wednesday, August 3, 2016 at 4:40:29 AM UTC+2, LostInThe Tubez wrote:
>
> I’d give Wazuh a whirl, if I were you. They’ve got decoders and rules for
> sysmon, as well as eventchannel working (or I assume they do, if they have
> that stuff setup for sysmon).
>
>
>
> My current decoder/rule development server and agents have been around
> long enough that I don’t recall what sort of Frankenstein mixture of agent
> and server versions I am running. Now that I think back on it, I’m fairly
> certain I had to track down a fixed version of the Windows agent in the
> listserv archives to make 2.8.3 work.
>
>
>
> *From:* [email protected] <javascript:> [mailto:
> [email protected] <javascript:>] *On Behalf Of *Craig Mitchell
> *Sent:* Tuesday, August 2, 2016 7:13 PM
> *To:* [email protected] <javascript:>
> *Subject:* Re: [ossec-list] eventchannel decoder testing
>
>
>
> Thanks for the input! I'll take a closer look at 2.8.3 but the whole
> reason I was looking at 2.9RC2 was because it supported the eventchannel
> log type. From what I understand, 2.8.x had trouble with this and therefore
> had trouble with sysmon. Has that been your experience with 2.8.3? Thanks
> again everyone for the help.
>
>
>
> On Tue, Aug 2, 2016 at 8:49 PM, lostinthetubez <[email protected]
> <javascript:>> wrote:
>
> Craig,
>
>
>
> Hm... I just now noticed your exact symptoms while playing with a test
> OSSEC server that was created from a relatively recent git clone of the
> repository (cloned within the last month or two?). Take a look at your
> original output of ossec-logtest, under “Prepended Data Removed”. Look at
> the parsed “log:” field. Ossec-logtest is stripping “2016 Jul 29 22:32:24
> WinEvtLog:” before processing it against the decoders. It isn’t supposed to
> be doing this. At least, this was not the behavior under 2.8.3. I do not
> have time to test the latest build from the repo to see if this problem has
> been fixed, though you might give that a whirl if you have the luxury of
> time. If you just want to make things work correctly, build your OSSEC
> server from the last known-good release, which is 2.8.3, or just follow
> Jesus’ suggestion and try out the Wazuh build.
>
>
>
>
>
> *From:* [email protected] <javascript:> [mailto:
> [email protected] <javascript:>] *On Behalf Of *Craig
> *Sent:* Sunday, July 31, 2016 3:14 PM
> *To:* ossec-list <[email protected] <javascript:>>
> *Subject:* Re: [ossec-list] eventchannel decoder testing
>
>
>
> Great, thank you. That does help troubleshoot. So, I do have a follow up
> question. Here is the default decoder:
>
>
>
> <decoder name="Sysmon-EventID#1">
>
> <type>windows</type>
>
> <prematch>INFORMATION\(1\)</prematch>
>
> <regex offset="after_prematch">Image: (\.*) \s*CommandLine: \.* \s*User:
> (\.*) \s*LogonGuid: \S* \s*LogonId: \S* \s*TerminalSessionId: \S*
> \s*IntegrityLevel: \.*HashType: \S* \s*Hash: (\S*) \s*ParentProcessGuid:
> \S* \s*ParentProcessID: \S* \s*ParentImage: (\.*)
> \s*ParentCommandLine:</regex>
>
> <order>status,user,url,data</order>
>
> </decoder>
>
>
>
> However, when I remove the prepended data from my archives.log file and
> send it through logtest, the decoder doesn't work (if I leave the prepended
> data there, the decoder works). Any ideas why this might be happening? See
> below for my logtest:
>
>
>
> *Prepended Data Removed:*
>
>
>
> **Phase 1: Completed pre-decoding.
>
> full event: '2016 Jul 29 22:32:24 WinEvtLog:
> Microsoft-Windows-Sysmon/Operational: INFORMATION(1):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY: Win7-x64-PC1.hackme.local:
> Process Create: UtcTime: 2016-07-30 03:32:24.846 ProcessGuid:
> {67C360F4-1FC8-579C-0000-001017F41E00} ProcessId: 3988 Image:
> C:\Users\administrator\Desktop\svchost.exe CommandLine:
> "C:\Users\administrator\Desktop\svchost.exe" CurrentDirectory:
> C:\Users\administrator\Desktop\ User: HACKME\Administrator LogonGuid:
> {67C360F4-1C55-579C-0000-00206BBC0600} LogonId: 0x6bc6b
> TerminalSessionId: 1 IntegrityLevel: High Hashes:
> MD5=C019D10F80409FC4C7D45EBFA48B0076 ParentProcessGuid:
> {67C360F4-1C57-579C-0000-001092EC0600} ParentProcessId: 3056 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE'
>
> hostname: 'ubuntu-srv1'
>
> program_name: 'WinEvtLog'
>
> log: 'Microsoft-Windows-Sysmon/Operational: INFORMATION(1):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY: Win7-x64-PC1.hackme.local:
> Process Create: UtcTime: 2016-07-30 03:32:24.846 ProcessGuid:
> {67C360F4-1FC8-579C-0000-001017F41E00} ProcessId: 3988 Image:
> C:\Users\administrator\Desktop\svchost.exe CommandLine:
> "C:\Users\administrator\Desktop\svchost.exe" CurrentDirectory:
> C:\Users\administrator\Desktop\ User: HACKME\Administrator LogonGuid:
> {67C360F4-1C55-579C-0000-00206BBC0600} LogonId: 0x6bc6b
> TerminalSessionId: 1 IntegrityLevel: High Hashes:
> MD5=C019D10F80409FC4C7D45EBFA48B0076 ParentProcessGuid:
> {67C360F4-1C57-579C-0000-001092EC0600} ParentProcessId: 3056 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE'
>
>
>
> ***Phase 2: Completed decoding.*
>
> * No decoder matched.*
>
>
>
> *Prepended Data Intact:*
>
>
>
> **Phase 1: Completed pre-decoding.
>
> full event: '*2016 Jul 29 22:32:25 (WIN7-X64-PC1)
> 172.16.213.5->WinEvtLog* 2016 Jul 29 22:32:24 WinEvtLog:
> Microsoft-Windows-Sysmon/Operational: INFORMATION(1):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY: Win7-x64-PC1.hackme.local:
> Process Create: UtcTime: 2016-07-30 03:32:24.846 ProcessGuid:
> {67C360F4-1FC8-579C-0000-001017F41E00} ProcessId: 3988 Image:
> C:\Users\administrator\Desktop\svchost.exe CommandLine:
> "C:\Users\administrator\Desktop\svchost.exe" CurrentDirectory:
> C:\Users\administrator\Desktop\ User: HACKME\Administrator LogonGuid:
> {67C360F4-1C55-579C-0000-00206BBC0600} LogonId: 0x6bc6b
> TerminalSessionId: 1 IntegrityLevel: High Hashes:
> MD5=C019D10F80409FC4C7D45EBFA48B0076 ParentProcessGuid:
> {67C360F4-1C57-579C-0000-001092EC0600} ParentProcessId: 3056 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE'
>
> hostname: '(WIN7-X64-PC1)'
>
> program_name: '(null)'
>
> log: '172.16.213.5->WinEvtLog 2016 Jul 29 22:32:24 WinEvtLog:
> Microsoft-Windows-Sysmon/Operational: INFORMATION(1):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY: Win7-x64-PC1.hackme.local:
> Process Create: UtcTime: 2016-07-30 03:32:24.846 ProcessGuid:
> {67C360F4-1FC8-579C-0000-001017F41E00} ProcessId: 3988 Image:
> C:\Users\administrator\Desktop\svchost.exe CommandLine:
> "C:\Users\administrator\Desktop\svchost.exe" CurrentDirectory:
> C:\Users\administrator\Desktop\ User: HACKME\Administrator LogonGuid:
> {67C360F4-1C55-579C-0000-00206BBC0600} LogonId: 0x6bc6b
> TerminalSessionId: 1 IntegrityLevel: High Hashes:
> MD5=C019D10F80409FC4C7D45EBFA48B0076 ParentProcessGuid:
> {67C360F4-1C57-579C-0000-001092EC0600} ParentProcessId: 3056 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE'
>
>
>
> ***Phase 2: Completed decoding.*
>
> * decoder: 'Sysmon-EventID#1'*
>
>
>
>
>
>
>
>
>
>
> On Friday, July 29, 2016 at 11:22:46 AM UTC-5, LostInThe Tubez wrote:
>
> Delving into Sysmon event log parsing reveals just how monumental a task
> it is to parse out useful information from Windows event logs. The
> challenge is that nearly each and every Event ID has a different log
> format, which essentially means that almost every Event ID needs its own
> decoder... I may be waxing a little dramatic here, but the point is that to
> properly parse Windows logs, the original decoder needs to be made more
> generic and LOTS more child decoders need to be developed. At least, that
> is the approach I took, personally. Maybe I’m totally off base. Been
> testing it for a few months and it seems to work OK, but I haven’t done any
> auditing to see if I’ve broken anything. Anyway, here’s what I did and what
> works for me at the moment. If you go this route, you’ll need to comment
> out the original windows decoder in /var/ossec/etc/decoder.xml (and
> whatever else sysmon-related might have made it in there since last I
> looked; I’m not running the latest beta). I put these in local_decoder.xml:
>
>
>
> <decoder name="windows">
>
> <type>windows</type>
>
> <prematch>^\d\d\d\d \w\w\w \d\d \d\d:\d\d:\d\d WinEvtLog:
> |^WinEvtLog: </prematch>
>
> </decoder>
>
>
>
> <decoder name="windows-defaultlogs">
>
> <parent>windows</parent>
>
> <type>windows</type>
>
> <use_own_name>true</use_own_name>
>
> <prematch offset="after_parent">^Application: |^Security:
> |^System: </prematch>
>
> <regex offset="after_parent">^\.+: (\w+)\((\d+)\): (\.+): </regex>
>
> <regex>(\.+): \.+: (\S+): </regex>
>
> <order>status, id, extra_data, user, system_name</order>
>
> <fts>name, location, user, system_name</fts>
>
> </decoder>
>
>
>
> <decoder name="windows-sysmon-eventID1">
>
> <parent>windows</parent>
>
> <type>windows</type>
>
> <prematch
> offset="after_parent">^Microsoft-Windows-Sysmon/Operational:
> INFORMATION\(1\)</prematch>
>
> <regex
> offset="after_parent">^Microsoft-Windows-Sysmon/Operational: (\w+)\((\d)\):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY: (\S+): Process Create: \.+
> ProcessId: \d+ Image: (\.*) CommandLine: \.*</regex>
>
> <regex> User: (\.*) LogonGuid: \S* LogonId: \S*
> TerminalSessionId: \d* IntegrityLevel: \w* Hashes: \w+=(\w*)
> ParentProcessGuid: \S* ParentProcessID: \S* ParentImage: (\.+)</regex>
>
> <order>status, id, system_name, dstuser, srcuser, url, extra_data,
> extra_data</order>
>
> </decoder>
>
>
>
>
>
> Put this in your local_rules.xml:
>
> <rule id="184600" level="1">
>
> <if_sid>18101</if_sid>
>
> <id>^1$</id>
>
> <description>Sysmon Process Launch Event</description>
>
> </rule>
>
>
>
> If you haven’t done so already, it is always helpful to enable logall mode
> when you’re working on new decoders. This will retain a copy of every
> single log line sent to your OSSEC manager. In your ossec.conf on the
> manager, put <logall>yes</logall> in a global tag somewhere and restart the
> service. You will now have a record of all logs sent to the manager, not
> just those that generate alerts. The current day’s archival logs are in
> /var/ossec/logs/archives/archives.log. Note that in order to run these
> particular logs through ossec-logtest, you’ll need to remove a prepended
> bit of text. So, edit a log entry like this:
>
>
>
> 2016 Jul 29 08:33:17 (hostname) 100.200.123.123->WinEvtLog 2016 Jul 29
> 08:36:08 WinEvtLog: Microsoft-Windows-Sysmon/Operational: INFORMATION(1):
> Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY:
> hostname.subdomain.domain.tld: Process Create: UtcTime: 2016-07-29
> 15:36:08.268 ProcessGuid: {A560AB96-77E8-579B-0000-0010B7B17E50}
> ProcessId: 50292 Image: C:\Program Files (x86)\KeePass Password Safe
> 2\KeePass.exe CommandLine: "C:\Program Files (x86)\KeePass Password Safe
> 2\KeePass.exe" CurrentDirectory: C:\Program Files (x86)\KeePass Password
> Safe 2\ User: domain\username LogonGuid:
> {A560AB96-40DE-578E-0000-00209886AB02} LogonId: 0x2AB8698
> TerminalSessionId: 1 IntegrityLevel: Medium Hashes:
> SHA1=5F5AC91EB83EFB6C4171AFF9EC1ED98EBA1C6A6C ParentProcessGuid:
> {A560AB96-40E0-578E-0000-0010285AAC02} ParentProcessId: 7540 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE
>
>
>
> to become:
>
> 2016 Jul 29 08:36:08 WinEvtLog: Microsoft-Windows-Sysmon/Operational:
> INFORMATION(1): Microsoft-Windows-Sysmon: SYSTEM: NT AUTHORITY:
> hostname.subdomain.domain.tld: Process Create: UtcTime: 2016-07-29
> 15:36:08.268 ProcessGuid: {A560AB96-77E8-579B-0000-0010B7B17E50}
> ProcessId: 50292 Image: C:\Program Files (x86)\KeePass Password Safe
> 2\KeePass.exe CommandLine: "C:\Program Files (x86)\KeePass Password Safe
> 2\KeePass.exe" CurrentDirectory: C:\Program Files (x86)\KeePass Password
> Safe 2\ User: domain\username LogonGuid:
> {A560AB96-40DE-578E-0000-00209886AB02} LogonId: 0x2AB8698
> TerminalSessionId: 1 IntegrityLevel: Medium Hashes:
> SHA1=5F5AC91EB83EFB6C4171AFF9EC1ED98EBA1C6A6C ParentProcessGuid:
> {A560AB96-40E0-578E-0000-0010285AAC02} ParentProcessId: 7540 ParentImage:
> C:\Windows\explorer.exe ParentCommandLine: C:\Windows\Explorer.EXE
>
>
>
> before copy/pasting into ossec-logtest. This is the best way to go about
> testing an eventchannel log. You get to see exactly what is decoded and
> which rules are triggered.
>
>
>
>
>
> *From:* [email protected] [mailto:[email protected]] *On
> Behalf Of *Craig
> *Sent:* Thursday, July 28, 2016 8:24 PM
> *To:* ossec-list <[email protected]>
> *Subject:* [ossec-list] eventchannel decoder testing
>
>
>
> I am currently running 2.9RC2 on both client and server:
>
>
>
> What is the best way to go about testing an eventchannel log? I have the
> following set in my local ossec.conf on my windows agent:
>
>
>
> <localfile>
>
> <location>Microsoft-Windows-Sysmon/Operational</location>
>
> <log_format>eventchannel</log_format>
>
> </localfile>
>
>
>
> I am using the default sysmon decoder included on my server:
>
>
>
> <decoder name="Sysmon-EventID#1">
>
> <type>windows</type>
>
> <prematch>INFORMATION\(1\)</prematch>
>
> <regex offset="after_prematch">Image: (\.*) \s*CommandLine: \.* \s*User:
> (\.*) \s*LogonGuid: \S* \s*LogonId: \S* \s*TerminalSessionId: \S*
> \s*IntegrityLevel: \.*HashType: \S* \s*Hash: (\S*) \s*ParentProcessGuid:
> \S* \s*ParentProcessID: \S* \s*ParentImage: (\.*)
> \s*ParentCommandLine:</regex>
>
> <order>status,user,url,data</order>
>
> </decoder>
>
>
>
> I modified the default sysmon rule so that I would capture all process
> creates by setting the level to 1:
>
>
>
> <rule id="184700" level="1">
>
> <if_sid>18100</if_sid>
>
> <description>Sysmon - Process Create Event</description>
>
> </rule>
>
>
>
>
>
> I would think that i would now see all process creates in my alerts.log
> but unfortunately I don't see any sysmon events at all. Any idea on the
> best way to troubleshoot this? Thank you!
>
>
>
>
>
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