Hi Rob, *extra_data *is another allowed field used by OSSEC decoders to extract information from the event, once it is extracted you can match the field content in order to create a rule. The content of extra_data depends on the decoder which extracted it, in Windows decoders <https://github.com/wazuh/ossec-rules/blob/master/rules-decoders/ossec/decoders/windows_decoders.xml#L350>could be for example: Win source, Parent Image, Protocol, Signature, Start function...
Best regards, Pedro S. On Tuesday, May 17, 2016 at 5:32:25 PM UTC+2, Rob B wrote: > > Thanks Brent.! Funny enough, that day I figured it out and built a > whole bunch very similar to your list. Seems to be working very nicely, as > now I find myself leaning to creating some down right creative > composites.... (finally) > > I've been looking for some reference material on the <extra_data> tag? > How is this used properly? > > > > Cheers! Rob > > > On Monday, May 16, 2016 at 5:22:08 PM UTC-4, Brent Morris wrote: >> >> Rob - can you post your OSSEC version of the log? I can check my rules. >> These are a culmination of gleaned rules that I updated some time back >> with new event IDs. Yours is covered in there.... but I would like to >> test it against a valid OSSEC log. So if you can post it from the OSSEC >> logs, that'd be great. >> >> Here they are.. >> >> </group> >> <!-- Microsoft Security Essentials rules --> >> <!-- see https://technet.microsoft.com/en-us/library/hh144989.aspx --> >> <group name="windows,mse,"> >> <rule id="720001" level="0"> >> <category>windows</category> >> <if_sid>18101,18102,18103</if_sid> >> <extra_data>^Microsoft Antimalware</extra_data> >> <description>Grouping of Microsoft Security Essentials >> rules.</description> >> </rule> >> >> <rule id="720010" level="12"> >> <if_sid>720001</if_sid> >> <id>^1118$|^1119$</id> >> <group>virus,</group> >> <description>Microsoft Security Essentials - Virus detected, but >> unable to remove.</description> >> </rule> >> <rule id="720011" level="7"> >> <if_sid>720001</if_sid> >> <id>^1117$</id> >> <group>virus,</group> >> <description>Microsoft Security Essentials - Virus detected and >> properly removed.</description> >> </rule> >> >> <rule id="720012" level="7"> >> <if_sid>720001</if_sid> >> <id>^1119$|^1118$|^1117$|^1116$</id> >> <group>virus,</group> >> <description>Microsoft Security Essentials - Virus >> detected.</description> >> </rule> >> >> <rule id="720013" level="7"> >> <if_sid>720001</if_sid> >> <id>^1015$</id> >> <group>virus,</group> >> <description>Microsoft Security Essentials - Suspicious activity >> detected.</description> >> </rule> >> >> <!-- Service conditions and errors --> >> <rule id="720020" level="3"> >> <if_sid>720001</if_sid> >> <id>^5007$</id> >> <description>Microsoft Security Essentials - Configuration >> changed.</description> >> <group>policy_changed,</group> >> </rule> >> <rule id="720021" level="9"> >> <if_sid>720001</if_sid> >> <id>^5008$</id> >> <description>Microsoft Security Essentials - Service >> failed.</description> >> </rule> >> <rule id="720022" level="9"> >> <if_sid>720001</if_sid> >> <id>^3002$</id> >> <description>Microsoft Security Essentials - Real time protection >> failed.</description> >> </rule> >> <rule id="720023" level="8"> >> <if_sid>720001</if_sid> >> <id>^2012$</id> >> <description>Microsoft Security Essentials - Cannot use Dynamic >> Signature Service.</description> >> </rule> >> <rule id="720024" level="8"> >> <if_sid>720001</if_sid> >> <id>^2004$</id> >> <description>Microsoft Security Essentials - Loading definitions >> failed. Using last good set.</description> >> </rule> >> <rule id="720025" level="8"> >> <if_sid>720001</if_sid> >> <id>^2003$</id> >> <description>Microsoft Security Essentials - Engine update >> failed.</description> >> </rule> >> <rule id="720026" level="8"> >> <if_sid>720001</if_sid> >> <id>^2001$</id> >> <description>Microsoft Security Essentials - Definitions update >> failed.</description> >> </rule> >> <rule id="720027" level="7"> >> <if_sid>720001</if_sid> >> <id>^1005$</id> >> <description>Microsoft Security Essentials - Scan error. Scan has >> stopped.</description> >> </rule> >> <rule id="720028" level="5"> >> <if_sid>720001</if_sid> >> <id>^1002$</id> >> <description>Microsoft Security Essentials - Scan stopped before >> completion.</description> >> </rule> >> >> <!-- EICAR test file special case --> >> <!-- www.eicar.org/86-0-Intended-use.html --> >> <rule id="720041" level="5"> >> <if_sid>720012</if_sid> >> <match>Virus:DOS/EICAR_Test_File</match> >> <options>alert_by_email</options> >> <description>Microsoft Security Essentials - EICAR test file >> detected.</description> >> </rule> >> <rule id="720042" level="3"> >> <if_sid>720011</if_sid> >> <match>Virus:DOS/EICAR_Test_File</match> >> <options>alert_by_email</options> >> <description>Microsoft Security Essentials - EICAR test file >> removed.</description> >> </rule> >> <rule id="720043" level="8"> >> <if_sid>720010</if_sid> >> <match>Virus:DOS/EICAR_Test_File</match> >> <options>alert_by_email</options> >> <description>Microsoft Security Essentials - EICAR test file >> detected, but removal failed.</description> >> </rule> >> >> <!-- Status messages --> >> <rule id="720050" level="3"> >> <if_sid>720001</if_sid> >> <id>^2000$</id> >> <description>Microsoft Security Essentials - Signature database >> updated.</description> >> </rule> >> <rule id="720051" level="3"> >> <if_sid>720001</if_sid> >> <id>^2002$</id> >> <description>Microsoft Security Essentials - Scan engine >> updated.</description> >> </rule> >> <rule id="720053" level="3"> >> <if_sid>720001</if_sid> >> <id>^1000$|^1001$</id> >> <description>Microsoft Security Essentials - Scan started or >> stopped.</description> >> </rule> >> <rule id="720054" level="4"> >> <if_sid>720001</if_sid> >> <id>^1013$</id> >> <description>Microsoft Security Essentials - History >> cleared.</description> >> </rule> >> >> <!-- Time based alerts --> >> <rule id="720070" level="10" frequency="4" timeframe="240"> >> <if_matched_sid>720011</if_matched_sid> >> <description>Multiple Microsoft Security Essentials AV warnings >> detected.</description> >> </rule> >> <rule id="720071" level="10" frequency="4" timeframe="240"> >> <if_matched_sid>720012</if_matched_sid> >> <description>Multiple Microsoft Security Essentials AV warnings >> detected.</description> >> </rule> >> >> </group> <!-- mse --> >> >> >> On Friday, April 22, 2016 at 1:16:22 PM UTC-7, Rob B wrote: >>> >>> Hello All, >>> >>> Does anyone have a decoder for Windows Defender floating around out >>> there?? >>> >>> Im having a heck of a time... Here is the event channel event example >>> if anyone is curious or can help: (Win10 box) >>> >>> Log Name: Microsoft-Windows-Windows Defender/Operational >>> Source: Microsoft-Windows-Windows Defender >>> Date: 4/22/2016 4:05:17 PM >>> Event ID: 1116 >>> Task Category: None >>> Level: Warning >>> Keywords: >>> User: SYSTEM >>> Computer: VICTIM0 >>> Description: >>> Windows Defender has detected malware or other potentially unwanted >>> software. >>> For more information please see the following: >>> >>> http://go.microsoft.com/fwlink/?linkid=37020&name=Trojan:Win32/Bagsu!rfn&threatid=2147694406&enterprise=0 >>> Name: Trojan:Win32/Bagsu!rfn >>> ID: 2147694406 >>> Severity: Severe >>> Category: Trojan >>> Path: >>> containerfile:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe;file:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe;file:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe->(VFS:svchost.exe) >>> Detection Origin: Network share >>> Detection Type: Concrete >>> Detection Source: Real-Time Protection >>> User: frog >>> Process Name: C:\Windows\explorer.exe >>> Signature Version: AV: 1.217.2054.0, AS: 1.217.2054.0, NIS: 115.8.0.0 >>> Engine Version: AM: 1.1.12603.0, NIS: 2.1.11804.0 >>> >>> Event Xml: >>> <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event";> >>> <System> >>> <Provider Name="Microsoft-Windows-Windows Defender" >>> Guid="{11CD958A-C507-4EF3-B3F2-5FD9DFBD2C78}" /> >>> <EventID>1116</EventID> >>> <Version>0</Version> >>> <Level>3</Level> >>> <Task>0</Task> >>> <Opcode>0</Opcode> >>> <Keywords>0x8000000000000000</Keywords> >>> <TimeCreated SystemTime="2016-04-22T20:05:17.551083000Z" /> >>> <EventRecordID>95</EventRecordID> >>> <Correlation ActivityID="{ECC2B320-F9A6-41AD-9F17-5C9EE24D3330}" /> >>> <Execution ProcessID="2332" ThreadID="4540" /> >>> <Channel>Microsoft-Windows-Windows Defender/Operational</Channel> >>> <Computer>VICTIM0</Computer> >>> <Security UserID="S-1-5-77" /> >>> </System> >>> <EventData> >>> <Data Name="Product Name">%%827</Data> >>> <Data Name="Product Version">4.9.10586.0</Data> >>> <Data Name="Detection >>> ID">{CAADD684-36C9-444B-8A6D-8CE537A93E40}</Data> >>> <Data Name="Detection Time">2016-04-22T20:04:40.369Z</Data> >>> <Data Name="Unused"> >>> </Data> >>> <Data Name="Unused2"> >>> </Data> >>> <Data Name="Threat ID">2147694406</Data> >>> <Data Name="Threat Name">Trojan:Win32/Bagsu!rfn</Data> >>> <Data Name="Severity ID">5</Data> >>> <Data Name="Severity Name">Severe</Data> >>> <Data Name="Category ID">8</Data> >>> <Data Name="Category Name">Trojan</Data> >>> <Data Name="FWLink"> >>> http://go.microsoft.com/fwlink/?linkid=37020&name=Trojan:Win32/Bagsu!rfn&threatid=2147694406&enterprise=0 >>> </Data> >>> <Data Name="Status Code">1</Data> >>> <Data Name="Status Description"> >>> </Data> >>> <Data Name="State">1</Data> >>> <Data Name="Source ID">3</Data> >>> <Data Name="Source Name">%%818</Data> >>> <Data Name="Process Name">C:\Windows\explorer.exe</Data> >>> <Data Name="Detection User">frog</Data> >>> <Data Name="Unused3"> >>> </Data> >>> <Data >>> Name="Path">containerfile:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe;file:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe;file:_\\10.0.1.10\share\Malware_For_Demo\REAL_BAD_Malz2\Server.exe->(VFS:svchost.exe)</Data> >>> <Data Name="Origin ID">2</Data> >>> <Data Name="Origin Name">%%846</Data> >>> <Data Name="Execution ID">1</Data> >>> <Data Name="Execution Name">%%813</Data> >>> <Data Name="Type ID">0</Data> >>> <Data Name="Type Name">%%822</Data> >>> <Data Name="Pre Execution Status">0</Data> >>> <Data Name="Action ID">9</Data> >>> <Data Name="Action Name">%%887</Data> >>> <Data Name="Unused4"> >>> </Data> >>> <Data Name="Error Code">0x00000000</Data> >>> <Data Name="Error Description">The operation completed successfully. >>> </Data> >>> <Data Name="Unused5"> >>> </Data> >>> <Data Name="Post Clean Status">0</Data> >>> <Data Name="Additional Actions ID">0</Data> >>> <Data Name="Additional Actions String">No additional actions >>> required</Data> >>> <Data Name="Remediation User"> >>> </Data> >>> <Data Name="Unused6"> >>> </Data> >>> <Data Name="Signature Version">AV: 1.217.2054.0, AS: 1.217.2054.0, >>> NIS: 115.8.0.0</Data> >>> <Data Name="Engine Version">AM: 1.1.12603.0, NIS: 2.1.11804.0</Data> >>> </EventData> >>> </Event> >>> >>> >>> Thanks!, Rob >>> >> -- --- You received this message because you are subscribed to the Google Groups "ossec-list" group. 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