ASIM Process Event schema parser with its sample and test data for SentinelOne

ASIM/dev/ASimTester/ASimTester.csv

@@ -540,7 +540,7 @@ EventProduct,string,Mandatory,Common,,,
 EventProduct,string,Mandatory,Dhcp,,,
 EventProduct,string,Mandatory,Dns,Enumerated,Umbrella|Azure Firewall|DNS Server|Sysmon|Sysmon for Linux|ZIA DNS|NIOS|Cloud DNS|Zeek|Vectra Stream,
 EventProduct,string,Mandatory,FileEvent,Enumerated,Sysmon for Linux|Sysmon|M365 Defender for Endpoint|Azure File Storage|SharePoint|OneDrive,
-EventProduct,string,Mandatory,NetworkSession,Enumerated,Fortigate|IOS|SDP|Vectra Stream|NSGFlow|Fireware|VPC|Azure Defender for IoT|Azure Firewall|M365 Defender for Endpoint|Sysmon|Sysmon for Linux|Windows Firewall|WireData|ZIA Firewall|CDL|PanOS|VMConnection|Meraki MX|Zeek|Firewall|ASA|Cynerio,
+EventProduct,string,Mandatory,NetworkSession,Enumerated,Fortigate|IOS|SDP|Vectra Stream|NSGFlow|Fireware|VPC|Azure Defender for IoT|Azure Firewall|M365 Defender for Endpoint|Sysmon|Sysmon for Linux|Windows Firewall|WireData|ZIA Firewall|CDL|PanOS|VMConnection|Meraki MX|Zeek|Firewall|ASA|Cynerio|SentinelOne,
 EventProduct,string,Mandatory,ProcessEvent,Enumerated,M365 Defender for Endpoint|Sysmon for Linux|Sysmon|Azure Defender for IoT|Security Events,
 EventProduct,string,Mandatory,RegistryEvent,Enumerated,M365 Defender for Endpoint|Security Events|Sysmon|Windows Event,
 EventProduct,string,Mandatory,UserManagement,,,
@@ -668,7 +668,7 @@ EventVendor,string,Mandatory,Common,,,
 EventVendor,string,Mandatory,Dhcp,,,
 EventVendor,string,Mandatory,Dns,Enumerated,Cisco|Corelight|GCP|Infoblox|Microsoft|Zscaler|Vectra AI,
 EventVendor,string,Mandatory,FileEvent,Enumerated,Microsoft,
-EventVendor,string,Mandatory,NetworkSession,Enumerated,Fortinet|AppGate|Palo Alto|Microsoft|Zscaler|AWS|Vectra AI|WatchGuard|Cisco|Corelight|Check Point|Forcepoint|Cynerio,
+EventVendor,string,Mandatory,NetworkSession,Enumerated,Fortinet|AppGate|Palo Alto|Microsoft|Zscaler|AWS|Vectra AI|WatchGuard|Cisco|Corelight|Check Point|Forcepoint|Cynerio|SentinelOne,
 EventVendor,string,Mandatory,ProcessEvent,Enumerated,Microsoft,
 EventVendor,string,Mandatory,UserManagement,,,
 EventVendor,string,Mandatory,WebSession,Enumerated,Microsoft|Squid|Zscaler|Vectra AI|Palo Alto|WatchGuard|Cisco|Forcepoint|Corelight|Dataminr,

Parsers/ASimProcessEvent/Parsers/ASimProcessCreateSentinelOne.yaml

@@ -0,0 +1,153 @@
+Parser:
+  Title: Process Create ASIM parser for SentinelOne
+  Version: '0.1.0'
+  LastUpdated: Sep 18, 2023
+Product:
+  Name: SentinelOne
+Normalization:
+  Schema: ProcessEvent
+  Version: '0.1.4'
+References:
+- Title: ASIM ProcessEvent Schema
+  Link: https://aka.ms/ASimProcessEventDoc
+- Title: ASIM
+  Link: https://aka.ms/AboutASIM
+- Title: SentinelOne Documentation
+- Link: https://<SOneInstanceDomain>.sentinelone.net/api-doc/overview
+Description: |
+  This ASIM parser supports normalizing SentinelOne logs to the ASIM Process Event normalized schema. SentinelOne events are captured through SentinelOne data connector which ingests SentinelOne server objects such as Threats, Agents, Applications, Activities, Policies, Groups, and more events into Microsoft Sentinel through the REST API.
+ParserName: ASimProcessCreateSentinelOne
+EquivalentBuiltInParser: _ASim_ProcessCreate_SentinelOne
+ParserParams:
+  - Name: disabled
+    Type: bool
+    Default: false
+ParserQuery: |
+  let ThreatConfidenceLookup_undefined = datatable(
+      alertInfo_analystVerdict_s: string,
+      ThreatConfidence_undefined: int
+  )
+  [
+      "FALSE_POSITIVE", 5,
+      "Undefined", 15,
+      "SUSPICIOUS", 25,
+      "TRUE_POSITIVE", 33 
+  ];
+  let ThreatConfidenceLookup_suspicious = datatable(
+      alertInfo_analystVerdict_s: string,
+      ThreatConfidence_suspicious: int
+  )
+  [
+      "FALSE_POSITIVE", 40,
+      "Undefined", 50,
+      "SUSPICIOUS", 60,
+      "TRUE_POSITIVE", 67 
+  ];
+  let ThreatConfidenceLookup_malicious = datatable(
+      alertInfo_analystVerdict_s: string,
+      ThreatConfidence_malicious: int
+  )
+  [
+      "FALSE_POSITIVE", 75,
+      "Undefined", 80,
+      "SUSPICIOUS", 90,
+      "TRUE_POSITIVE", 100 
+  ];
+  let parser = (disabled: bool=false) {
+      let alldata = SentinelOne_CL
+          | where not(disabled) 
+              and event_name_s == "Alerts."
+              and alertInfo_eventType_s == "PROCESSCREATION";
+      let undefineddata = alldata
+          | where ruleInfo_treatAsThreat_s == "UNDEFINED"
+          | lookup ThreatConfidenceLookup_undefined on alertInfo_analystVerdict_s;
+      let suspiciousdata = alldata
+          | where ruleInfo_treatAsThreat_s == "Suspicious"
+          | lookup ThreatConfidenceLookup_suspicious on alertInfo_analystVerdict_s;
+      let maaliciousdata = alldata
+          | where ruleInfo_treatAsThreat_s == "Malicious"
+          | lookup ThreatConfidenceLookup_malicious on alertInfo_analystVerdict_s;
+      union undefineddata, suspiciousdata, maaliciousdata
+      | extend ThreatConfidence = coalesce(ThreatConfidence_undefined, ThreatConfidence_suspicious, ThreatConfidence_malicious)
+      | project-rename
+          DvcId = agentDetectionInfo_uuid_g,
+          EventStartTime = sourceProcessInfo_pidStarttime_t,
+          TargetProcessCommandLine = targetProcessInfo_tgtProcCmdLine_s,
+          TargetProcessId = targetProcessInfo_tgtProcPid_s,
+          TargetProcessName = targetProcessInfo_tgtProcName_s,
+          EventUid = _ItemId,
+          TargetProcessCreationTime = targetProcessInfo_tgtProcessStartTime_t,
+          ActingProcessName = sourceProcessInfo_name_s,
+          ParentProcessName = sourceParentProcessInfo_name_s,
+          ActingProcessCommandLine = sourceProcessInfo_commandline_s,
+          ActingProcessGuid = sourceProcessInfo_uniqueId_g,
+          ActingProcessSHA1 = sourceProcessInfo_fileHashSha1_s,
+          ParentProcessSHA1 = sourceParentProcessInfo_fileHashSha1_s,
+          ActingProcessSHA256 = sourceProcessInfo_fileHashSha256_s,
+          ParentProcessSHA256 = sourceParentProcessInfo_fileHashSha256_s,
+          DvcOs = agentDetectionInfo_osName_s,
+          DvcOsVersion = agentDetectionInfo_osRevision_s,
+          TargetProcessIntegrityLevel = targetProcessInfo_tgtProcIntegrityLevel_s,
+          EventOriginalType = alertInfo_eventType_s,
+          EventOriginalSeverity = ruleInfo_severity_s,
+          EventOriginalUid = alertInfo_dvEventId_s,
+          RuleName = ruleInfo_name_s,
+          ThreatOriginalConfidence = ruleInfo_treatAsThreat_s
+      | invoke _ASIM_ResolveDvcFQDN('agentDetectionInfo_name_s')
+      | extend
+          ActingProcessId = sourceProcessInfo_pid_s,
+          ActorUsername = sourceProcessInfo_user_s,
+          TargetUsername = sourceProcessInfo_user_s,
+          Hash = coalesce(targetProcessInfo_tgtFileHashSha256_s, targetProcessInfo_tgtFileHashSha1_s),
+          ParentProcessId = sourceProcessInfo_pid_s,
+          TargetProcessSHA1 = targetProcessInfo_tgtFileHashSha1_s,
+          TargetProcessSHA256 = targetProcessInfo_tgtFileHashSha256_s,
+          ParentProcessMD5 = replace_string(sourceParentProcessInfo_fileHashMd5_g, "-", ""),
+          ActingProcessMD5 = replace_string(sourceProcessInfo_fileHashMd5_g, "-", ""),
+          EventSeverity = iff(EventOriginalSeverity == "Critical", "High", EventOriginalSeverity)
+      | extend
+          EventCount = int(1),
+          EventProduct = "SentinelOne",
+          EventResult = "Success",
+          DvcAction = "Allowed",
+          EventSchemaVersion = "0.1.4",
+          EventType = "ProcessCreated",
+          EventVendor = "SentinelOne",
+          EventSchema = "ProcessEvent"
+      | extend 
+          Dvc = DvcId,
+          EventEndTime = EventStartTime,
+          User = TargetUsername,
+          ActingProcessCreationTime = EventStartTime,
+          CommandLine = TargetProcessCommandLine,
+          Process = TargetProcessName,
+          Rule = RuleName
+      | extend 
+          HashType = case(
+                isnotempty(Hash) and isnotempty(TargetProcessSHA256),
+                "TargetProcessSHA256",
+                isnotempty(Hash) and isnotempty(TargetProcessSHA1),
+                "TargetProcessSHA1",
+                ""
+            ),
+          TargetUsernameType = _ASIM_GetUsernameType(TargetUsername),
+          TargetUserType = _ASIM_GetUserType(TargetUsername, ""),
+          DvcIdType = iff(isnotempty(DvcId), "Other", ""),
+          ActorUsernameType = _ASIM_GetUsernameType(ActorUsername),
+          ActorUserType = _ASIM_GetUserType(ActorUsername, "")
+      | project-away
+          *_d,
+          *_s,
+          *_g,
+          *_t,
+          *_b,
+          _ResourceId,
+          TenantId,
+          RawData,
+          Computer,
+          MG,
+          ManagementGroupName,
+          SourceSystem,
+          ThreatConfidence_*
+  };
+  parser(disabled=disabled)

Parsers/ASimProcessEvent/Parsers/ASimProcessEvent.yaml

@@ -29,6 +29,7 @@ Parsers:
   - _ASim_ProcessEvent_TerminateMicrosoftWindowsEvents
   - _ASim_ProcessEvent_CreateMicrosoftWindowsEvents
   - _ASim_ProcessEvent_MD4IoT
+  - _ASim_ProcessEvent_CreateSentinelOne
 
 ParserQuery: |
   let DisabledParsers=materialize(_GetWatchlist('ASimDisabledParsers') | where SearchKey in ('Any', 'ExcludeASimProcess') | extend SourceSpecificParser=column_ifexists('SourceSpecificParser','') | distinct SourceSpecificParser);
@@ -44,4 +45,5 @@ ParserQuery: |
     ASimProcessTerminateLinuxSysmon(imProcessEventBuiltInDisabled or ('ExcludeASimProcessTerminateLinuxSysmon' in (DisabledParsers) )),
     ASimProcessTerminateMicrosoftWindowsEvents(imProcessEventBuiltInDisabled or ('ExcludeASimProcessTerminateMicrosoftWindowsEvents' in (DisabledParsers) )),
     ASimProcessCreateMicrosoftWindowsEvents(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateMicrosoftWindowsEvents' in (DisabledParsers) )),
-    ASimProcessEventMD4IoT(imProcessEventBuiltInDisabled or ('ExcludeASimProcessEventMD4IoTh' in (DisabledParsers) ))
+    ASimProcessEventMD4IoT(imProcessEventBuiltInDisabled or ('ExcludeASimProcessEventMD4IoTh' in (DisabledParsers) )),
+    ASimProcessCreateSentinelOne(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateSentinelOne' in (DisabledParsers) ))

Parsers/ASimProcessEvent/Parsers/ASimProcessEventCreate.yaml

@@ -24,6 +24,7 @@ Parsers:
   - _ASim_ProcessEvent_CreateLinuxSysmon
   - _ASim_ProcessEvent_CreateMicrosoftWindowsEvents
   - _ASim_ProcessEvent_MD4IoT
+  - _ASim_ProcessEvent_CreateSentinelOne
 
 ParserQuery: |
   let DisabledParsers=materialize(_GetWatchlist('ASimDisabledParsers') | where SearchKey in ('Any', 'ExcludeASimProcessEventCreate') | extend SourceSpecificParser=column_ifexists('SourceSpecificParser','') | distinct SourceSpecificParser);
@@ -35,4 +36,5 @@ ParserQuery: |
     ASimProcessCreateMicrosoftSecurityEvents(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateMicrosoftSecurityEvents' in (DisabledParsers) )),
     ASimProcessCreateLinuxSysmon(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateLinuxSysmon' in (DisabledParsers) )),
     ASimProcessCreateMicrosoftWindowsEvents(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateMicrosoftWindowsEvents' in (DisabledParsers) )),
-    ASimProcessEventMD4IoT(imProcessEventBuiltInDisabled or ('ExcludeASimProcessEventMD4IoT' in (DisabledParsers) ))
+    ASimProcessEventMD4IoT(imProcessEventBuiltInDisabled or ('ExcludeASimProcessEventMD4IoT' in (DisabledParsers) )),
+    ASimProcessCreateSentinelOne(imProcessEventBuiltInDisabled or ('ExcludeASimProcessCreateSentinelOne' in (DisabledParsers) ))