Dumping LSASS Process Into a File

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Id	a7b9df32-1367-402d-b385-882daf6e3020
Rulename	Dumping LSASS Process Into a File
Description	Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS). After a user logs on, the system generates and stores a variety of credential materials in LSASS process memory. These credential materials can be harvested by an administrative user or system and used to conduct lateral movement using alternate authentication materials. As well as in-memory techniques, the LSASS process memory can be dumped from the target host and analyzed on a local system. Ref: https://attack.mitre.org/techniques/T1003/001/
Severity	High
Tactics	CredentialAccess
Techniques	T1003.001
Required data connectors	SecurityEvents WindowsSecurityEvents
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/DumpingLSASSProcessIntoaFile.yaml
Version	1.0.3
Arm template	a7b9df32-1367-402d-b385-882daf6e3020.json

KQL

Event
| where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID==10
| parse EventData with * 'TargetImage">' TargetImage "<" * 'GrantedAccess">' GrantedAccess "<" * 'CallTrace">' CallTrace "<" * 
| where GrantedAccess =~ "0x1FFFFF" and TargetImage =~ "C:\\Windows\\System32\\lsass.exe" and CallTrace has_any ("dbghelp.dll","dbgcore.dll")
| parse EventData with * 'SourceProcessGUID">' SourceProcessGUID "<" * 'SourceImage">' SourceImage "<" *
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, SourceProcessGUID, SourceImage, GrantedAccess, TargetImage, CallTrace
| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')

YAML

status: Available
id: a7b9df32-1367-402d-b385-882daf6e3020
query: |
  Event
  | where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID==10
  | parse EventData with * 'TargetImage">' TargetImage "<" * 'GrantedAccess">' GrantedAccess "<" * 'CallTrace">' CallTrace "<" * 
  | where GrantedAccess =~ "0x1FFFFF" and TargetImage =~ "C:\\Windows\\System32\\lsass.exe" and CallTrace has_any ("dbghelp.dll","dbgcore.dll")
  | parse EventData with * 'SourceProcessGUID">' SourceProcessGUID "<" * 'SourceImage">' SourceImage "<" *
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, SourceProcessGUID, SourceImage, GrantedAccess, TargetImage, CallTrace
  | extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/DumpingLSASSProcessIntoaFile.yaml
description: |
  'Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
  After a user logs on, the system generates and stores a variety of credential materials in LSASS process memory.
  These credential materials can be harvested by an administrative user or system and used to conduct lateral movement using alternate authentication materials.
  As well as in-memory techniques, the LSASS process memory can be dumped from the target host and analyzed on a local system.
  Ref: https://attack.mitre.org/techniques/T1003/001/'  
name: Dumping LSASS Process Into a File
relevantTechniques:
- T1003.001
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: Computer
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: DnsDomain
- entityType: Process
  fieldMappings:
  - identifier: CommandLine
    columnName: SourceImage
triggerThreshold: 0
severity: High
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
queryFrequency: 1h
queryPeriod: 1h
version: 1.0.3
kind: Scheduled
tactics:
- CredentialAccess
triggerOperator: gt

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a7b9df32-1367-402d-b385-882daf6e3020')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a7b9df32-1367-402d-b385-882daf6e3020')]",
      "properties": {
        "alertRuleTemplateName": "a7b9df32-1367-402d-b385-882daf6e3020",
        "customDetails": null,
        "description": "'Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).\nAfter a user logs on, the system generates and stores a variety of credential materials in LSASS process memory.\nThese credential materials can be harvested by an administrative user or system and used to conduct lateral movement using alternate authentication materials.\nAs well as in-memory techniques, the LSASS process memory can be dumped from the target host and analyzed on a local system.\nRef: https://attack.mitre.org/techniques/T1003/001/'\n",
        "displayName": "Dumping LSASS Process Into a File",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Computer",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "SourceImage",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/DumpingLSASSProcessIntoaFile.yaml",
        "query": "Event\n| where EventLog =~ \"Microsoft-Windows-Sysmon/Operational\" and EventID==10\n| parse EventData with * 'TargetImage\">' TargetImage \"<\" * 'GrantedAccess\">' GrantedAccess \"<\" * 'CallTrace\">' CallTrace \"<\" * \n| where GrantedAccess =~ \"0x1FFFFF\" and TargetImage =~ \"C:\\\\Windows\\\\System32\\\\lsass.exe\" and CallTrace has_any (\"dbghelp.dll\",\"dbgcore.dll\")\n| parse EventData with * 'SourceProcessGUID\">' SourceProcessGUID \"<\" * 'SourceImage\">' SourceImage \"<\" *\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, SourceProcessGUID, SourceImage, GrantedAccess, TargetImage, CallTrace\n| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1003.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1003"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}