TEARDROP memory-only dropper

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Id	738702fd-0a66-42c7-8586-e30f0583f8fe
Rulename	TEARDROP memory-only dropper
Description	Identifies SolarWinds TEARDROP memory-only dropper IOCs in Window’s defender Exploit Guard activity References: - https://www.fireeye.com/blog/threat-research/2020/12/evasive-attacker-leverages-solarwinds-supply-chain-compromises-with-sunburst-backdoor.html - https://gist.github.com/olafhartong/71ffdd4cab4b6acd5cbcd1a0691ff82f
Severity	High
Tactics	Execution Persistence DefenseEvasion
Techniques	T1543 T1059 T1027
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/SolarWinds_TEARDROP_Process-IOCs.yaml
Version	1.0.6
Arm template	738702fd-0a66-42c7-8586-e30f0583f8fe.json

KQL

DeviceEvents
| where ActionType has "ExploitGuardNonMicrosoftSignedBlocked"
| where InitiatingProcessFileName has "svchost.exe" and FileName has "NetSetupSvc.dll"
| extend HashAlgorithm = "SHA1"
| extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)

YAML

kind: Scheduled
severity: High
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: DeviceName
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: HostNameDomain
  entityType: Host
- fieldMappings:
  - identifier: FullName
    columnName: InitiatingProcessAccountUpn
  - identifier: Name
    columnName: InitiatingProcessAccountName
  - identifier: UPNSuffix
    columnName: InitiatingProcessAccountDomain
  entityType: Account
- fieldMappings:
  - identifier: Algorithm
    columnName: HashAlgorithm
  - identifier: Value
    columnName: InitiatingProcessSHA1
  entityType: FileHash
name: TEARDROP memory-only dropper
relevantTechniques:
- T1543
- T1059
- T1027
triggerOperator: gt
tactics:
- Execution
- Persistence
- DefenseEvasion
query: |
  DeviceEvents
  | where ActionType has "ExploitGuardNonMicrosoftSignedBlocked"
  | where InitiatingProcessFileName has "svchost.exe" and FileName has "NetSetupSvc.dll"
  | extend HashAlgorithm = "SHA1"
  | extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)  
triggerThreshold: 0
tags:
- Sunburst
- Solorigate
- NOBELIUM
status: Available
description: |
  Identifies SolarWinds TEARDROP memory-only dropper IOCs in Window's defender Exploit Guard activity
  References:
  - https://www.fireeye.com/blog/threat-research/2020/12/evasive-attacker-leverages-solarwinds-supply-chain-compromises-with-sunburst-backdoor.html
  - https://gist.github.com/olafhartong/71ffdd4cab4b6acd5cbcd1a0691ff82f  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/SolarWinds_TEARDROP_Process-IOCs.yaml
queryFrequency: 1d
queryPeriod: 1d
id: 738702fd-0a66-42c7-8586-e30f0583f8fe
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceEvents
version: 1.0.6

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/738702fd-0a66-42c7-8586-e30f0583f8fe')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/738702fd-0a66-42c7-8586-e30f0583f8fe')]",
      "properties": {
        "alertRuleTemplateName": "738702fd-0a66-42c7-8586-e30f0583f8fe",
        "customDetails": null,
        "description": "Identifies SolarWinds TEARDROP memory-only dropper IOCs in Window's defender Exploit Guard activity\nReferences:\n- https://www.fireeye.com/blog/threat-research/2020/12/evasive-attacker-leverages-solarwinds-supply-chain-compromises-with-sunburst-backdoor.html\n- https://gist.github.com/olafhartong/71ffdd4cab4b6acd5cbcd1a0691ff82f\n",
        "displayName": "TEARDROP memory-only dropper",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessAccountUpn",
                "identifier": "FullName"
              },
              {
                "columnName": "InitiatingProcessAccountName",
                "identifier": "Name"
              },
              {
                "columnName": "InitiatingProcessAccountDomain",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "FileHash",
            "fieldMappings": [
              {
                "columnName": "HashAlgorithm",
                "identifier": "Algorithm"
              },
              {
                "columnName": "InitiatingProcessSHA1",
                "identifier": "Value"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/SolarWinds_TEARDROP_Process-IOCs.yaml",
        "query": "DeviceEvents\n| where ActionType has \"ExploitGuardNonMicrosoftSignedBlocked\"\n| where InitiatingProcessFileName has \"svchost.exe\" and FileName has \"NetSetupSvc.dll\"\n| extend HashAlgorithm = \"SHA1\"\n| extend HostName = tostring(split(DeviceName, \".\")[0]), DomainIndex = toint(indexof(DeviceName, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution",
          "Persistence"
        ],
        "tags": [
          "Sunburst",
          "Solorigate",
          "NOBELIUM"
        ],
        "techniques": [
          "T1027",
          "T1059",
          "T1543"
        ],
        "templateVersion": "1.0.6",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}