Maxime Thiebaut
c5bdd18d8d
When Sysmon logs a "RegistryEvent" event of ID 13, the event might contain a field named "RuleName" as shown in the following excerpt. ```xml <?xml version="1.0" encoding="utf-8" standalone="yes"?> <Events> <Event xmlns='http://schemas.microsoft.com/win/2004/08/events/event'> <System> <Provider Name='Microsoft-Windows-Sysmon' Guid='{5770385f-c22a-43e0-bf4c-06f5698ffbd9}'/> <EventID>13</EventID> <Version>2</Version> <Level>4</Level> <Task>13</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime='2020-03-18T03:52:07.173448000Z'/> <EventRecordID>160631</EventRecordID> <Correlation/> <Execution ProcessID='2156' ThreadID='3628'/> <Channel>Microsoft-Windows-Sysmon/Operational</Channel> <Computer>win10.sec699-40.lab</Computer> <Security UserID='S-1-5-18'/> </System> <EventData> <Data Name='RuleName'>Context,ProtectedModeExitOrMacrosUsed</Data> <Data Name='EventType'>SetValue</Data> <Data Name='UtcTime'>2020-03-18 03:52:07.129</Data> <Data Name='ProcessGuid'>{36aa6401-9acb-5e71-0000-0010e3ed6803}</Data> <Data Name='ProcessId'>5064</Data> <Data Name='Image'>C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE</Data> <Data Name='TargetObject'>HKU\S-1-5-21-1850752718-2055233276-2633568556-1126\Software\Microsoft\Office\16.0\Word\Security\Trusted Documents\TrustRecords\%USERPROFILE%/Documents/sec699.docm</Data> <Data Name='Details'>Binary Data</Data> </EventData> </Event> </Events> ``` When used in combination with Elastic's Winlogbeat, the resulting field is named `winlog.event_data.RuleName`. This commit introduces a mapping between the Sigma `RuleName` field (pre-existing in the `arcsight.yml` config) and Elastic's `winlog.event_data.RuleName`. The presence of this field could be leveraged to build Sigma rules detecting events such as the above where a malicious macro was executed.
This package contains libraries for processing of Sigma rules and the following command line tools:
- sigmac: converter between Sigma rules and SIEM queries:
- Elasticsearch query strings
- Kibana JSON with searches
- Splunk SPL queries
- Elasticsearch X-Pack Watcher
- Logpoint queries
- merge_sigma: Merge Sigma collections into simple Sigma rules.
- sigma2misp: Import Sigma rules to MISP events.