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Dev-0228 File Path Hashes November 2021 ASIM Version

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Id29a29e5d-354e-4f5e-8321-8b39d25047bf
RulenameDev-0228 File Path Hashes November 2021 (ASIM Version)
DescriptionThis hunting query looks for file paths/hashes related to observed activity by Dev-0228. The actor is known to use custom version of popular tool like PsExec, Procdump etc. to carry its activity.

The risk score associated with each result is based on a number of factors, hosts with higher risk events should be investigated first.

This query uses the Microsoft Sentinel Information Model - https://docs.microsoft.com/azure/sentinel/normalization
SeverityHigh
TacticsCredentialAccess
Execution
TechniquesT1569
T1003
KindScheduled
Query frequency6h
Query period6h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/imFileEvent_Dev-0228FilePathHashesNovember2021(ASIMVersion).yaml
Version1.2.2
Arm template29a29e5d-354e-4f5e-8321-8b39d25047bf.json
Deploy To Azure
let files1 = dynamic(["C:\\Windows\\TAPI\\lsa.exe", "C:\\Windows\\TAPI\\pa.exe", "C:\\Windows\\TAPI\\pc.exe", "C:\\Windows\\TAPI\\Rar.exe"]);
let files2 = dynamic(["svchost.exe","wdmsvc.exe"]);
let FileHash1 = dynamic(["43109fbe8b752f7a9076eaafa417d9ae5c6e827cd5374b866672263fdebd5ec3", "ab50d8d707b97712178a92bbac74ccc2a5699eb41c17aa77f713ff3e568dcedb", "010e32be0f86545e116a8bc3381a8428933eb8789f32c261c81fd5e7857d4a77",     "56cd102b9fc7f3523dad01d632525ff673259dbc9a091be0feff333c931574f7"]);
let FileHash2 = dynamic(["2a1044e9e6e87a032f80c6d9ea6ae61bbbb053c0a21b186ecb3b812b49eb03b7", "9ab7e99ed84f94a7b6409b87e56dc6e1143b05034a5e4455e8c555dbbcd0d2dd", "18a072ccfab239e140d8f682e2874e8ff19d94311fc8bb9564043d3e0deda54b"]);
imProcessCreate
| where ((Process has_any (files1)) and (ActingProcessSHA256 has_any (FileHash1))) or ((Process has_any (files2)) and (ActingProcessSHA256 has_any (FileHash2)))
// Increase risk score if recent alerts for the host
| join kind=leftouter (
  SecurityAlert
  | where ProviderName =~ "MDATP"
  | extend ThreatName = tostring(parse_json(ExtendedProperties).ThreatName)
  | mv-expand todynamic(Entities)
  | extend DvcId = tostring(parse_json(Entities).MdatpDeviceId)
  | where isnotempty(DvcId)
  // Higher risk score are for Defender alerts related to threat actor
  | extend AlertRiskScore = iif(ThreatName has_any ("Backdoor:MSIL/ShellClient.A", "Backdoor:MSIL/ShellClient.A!dll", "Trojan:MSIL/Mimikatz.BA!MTB"), 1.0, 0.5)
  | project DvcId, AlertRiskScore) 
  on DvcId
| extend AlertRiskScore = iif(isempty(AlertRiskScore), 0.0, AlertRiskScore)
| extend AccountName = tostring(split(ActorUsername, @'\')[1]), AccountNTDomain = tostring(split(ActorUsername, @'\')[0])
| extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)
| project-away DomainIndex
kind: Scheduled
triggerThreshold: 0
relevantTechniques:
- T1569
- T1003
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/imFileEvent_Dev-0228FilePathHashesNovember2021(ASIMVersion).yaml
requiredDataConnectors: []
queryPeriod: 6h
tactics:
- CredentialAccess
- Execution
severity: High
triggerOperator: gt
description: |
  'This hunting query looks for file paths/hashes related to observed activity by Dev-0228. The actor is known to use custom version of popular tool like PsExec, Procdump etc. to carry its activity.
   The risk score associated with each result is based on a number of factors, hosts with higher risk events should be investigated first.
   This query uses the Microsoft Sentinel Information Model - https://docs.microsoft.com/azure/sentinel/normalization'  
query: |
  let files1 = dynamic(["C:\\Windows\\TAPI\\lsa.exe", "C:\\Windows\\TAPI\\pa.exe", "C:\\Windows\\TAPI\\pc.exe", "C:\\Windows\\TAPI\\Rar.exe"]);
  let files2 = dynamic(["svchost.exe","wdmsvc.exe"]);
  let FileHash1 = dynamic(["43109fbe8b752f7a9076eaafa417d9ae5c6e827cd5374b866672263fdebd5ec3", "ab50d8d707b97712178a92bbac74ccc2a5699eb41c17aa77f713ff3e568dcedb", "010e32be0f86545e116a8bc3381a8428933eb8789f32c261c81fd5e7857d4a77",     "56cd102b9fc7f3523dad01d632525ff673259dbc9a091be0feff333c931574f7"]);
  let FileHash2 = dynamic(["2a1044e9e6e87a032f80c6d9ea6ae61bbbb053c0a21b186ecb3b812b49eb03b7", "9ab7e99ed84f94a7b6409b87e56dc6e1143b05034a5e4455e8c555dbbcd0d2dd", "18a072ccfab239e140d8f682e2874e8ff19d94311fc8bb9564043d3e0deda54b"]);
  imProcessCreate
  | where ((Process has_any (files1)) and (ActingProcessSHA256 has_any (FileHash1))) or ((Process has_any (files2)) and (ActingProcessSHA256 has_any (FileHash2)))
  // Increase risk score if recent alerts for the host
  | join kind=leftouter (
    SecurityAlert
    | where ProviderName =~ "MDATP"
    | extend ThreatName = tostring(parse_json(ExtendedProperties).ThreatName)
    | mv-expand todynamic(Entities)
    | extend DvcId = tostring(parse_json(Entities).MdatpDeviceId)
    | where isnotempty(DvcId)
    // Higher risk score are for Defender alerts related to threat actor
    | extend AlertRiskScore = iif(ThreatName has_any ("Backdoor:MSIL/ShellClient.A", "Backdoor:MSIL/ShellClient.A!dll", "Trojan:MSIL/Mimikatz.BA!MTB"), 1.0, 0.5)
    | project DvcId, AlertRiskScore) 
    on DvcId
  | extend AlertRiskScore = iif(isempty(AlertRiskScore), 0.0, AlertRiskScore)
  | extend AccountName = tostring(split(ActorUsername, @'\')[1]), AccountNTDomain = tostring(split(ActorUsername, @'\')[0])
  | extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)
  | project-away DomainIndex  
name: Dev-0228 File Path Hashes November 2021 (ASIM Version)
version: 1.2.2
metadata:
  support:
    tier: Community
  categories:
    domains:
    - Security - Threat Intelligence
  author:
    name: Microsoft Security Research
  source:
    kind: Community
id: 29a29e5d-354e-4f5e-8321-8b39d25047bf
queryFrequency: 6h
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: ActorUsername
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountNTDomain
    identifier: NTDomain
- entityType: Host
  fieldMappings:
  - columnName: Dvc
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: HostNameDomain
    identifier: DnsDomain
- entityType: File
  fieldMappings:
  - columnName: FileName
    identifier: Name
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/29a29e5d-354e-4f5e-8321-8b39d25047bf')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/29a29e5d-354e-4f5e-8321-8b39d25047bf')]",
      "properties": {
        "alertRuleTemplateName": "29a29e5d-354e-4f5e-8321-8b39d25047bf",
        "customDetails": null,
        "description": "'This hunting query looks for file paths/hashes related to observed activity by Dev-0228. The actor is known to use custom version of popular tool like PsExec, Procdump etc. to carry its activity.\n The risk score associated with each result is based on a number of factors, hosts with higher risk events should be investigated first.\n This query uses the Microsoft Sentinel Information Model - https://docs.microsoft.com/azure/sentinel/normalization'\n",
        "displayName": "Dev-0228 File Path Hashes November 2021 (ASIM Version)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ActorUsername",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountNTDomain",
                "identifier": "NTDomain"
              }
            ]
          },
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "Dvc",
                "identifier": "FullName"
              },
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "HostNameDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "File",
            "fieldMappings": [
              {
                "columnName": "FileName",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/imFileEvent_Dev-0228FilePathHashesNovember2021(ASIMVersion).yaml",
        "query": "let files1 = dynamic([\"C:\\\\Windows\\\\TAPI\\\\lsa.exe\", \"C:\\\\Windows\\\\TAPI\\\\pa.exe\", \"C:\\\\Windows\\\\TAPI\\\\pc.exe\", \"C:\\\\Windows\\\\TAPI\\\\Rar.exe\"]);\nlet files2 = dynamic([\"svchost.exe\",\"wdmsvc.exe\"]);\nlet FileHash1 = dynamic([\"43109fbe8b752f7a9076eaafa417d9ae5c6e827cd5374b866672263fdebd5ec3\", \"ab50d8d707b97712178a92bbac74ccc2a5699eb41c17aa77f713ff3e568dcedb\", \"010e32be0f86545e116a8bc3381a8428933eb8789f32c261c81fd5e7857d4a77\",     \"56cd102b9fc7f3523dad01d632525ff673259dbc9a091be0feff333c931574f7\"]);\nlet FileHash2 = dynamic([\"2a1044e9e6e87a032f80c6d9ea6ae61bbbb053c0a21b186ecb3b812b49eb03b7\", \"9ab7e99ed84f94a7b6409b87e56dc6e1143b05034a5e4455e8c555dbbcd0d2dd\", \"18a072ccfab239e140d8f682e2874e8ff19d94311fc8bb9564043d3e0deda54b\"]);\nimProcessCreate\n| where ((Process has_any (files1)) and (ActingProcessSHA256 has_any (FileHash1))) or ((Process has_any (files2)) and (ActingProcessSHA256 has_any (FileHash2)))\n// Increase risk score if recent alerts for the host\n| join kind=leftouter (\n  SecurityAlert\n  | where ProviderName =~ \"MDATP\"\n  | extend ThreatName = tostring(parse_json(ExtendedProperties).ThreatName)\n  | mv-expand todynamic(Entities)\n  | extend DvcId = tostring(parse_json(Entities).MdatpDeviceId)\n  | where isnotempty(DvcId)\n  // Higher risk score are for Defender alerts related to threat actor\n  | extend AlertRiskScore = iif(ThreatName has_any (\"Backdoor:MSIL/ShellClient.A\", \"Backdoor:MSIL/ShellClient.A!dll\", \"Trojan:MSIL/Mimikatz.BA!MTB\"), 1.0, 0.5)\n  | project DvcId, AlertRiskScore) \n  on DvcId\n| extend AlertRiskScore = iif(isempty(AlertRiskScore), 0.0, AlertRiskScore)\n| extend AccountName = tostring(split(ActorUsername, @'\\')[1]), AccountNTDomain = tostring(split(ActorUsername, @'\\')[0])\n| extend HostName = tostring(split(Dvc, \".\")[0]), DomainIndex = toint(indexof(Dvc, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)\n| project-away DomainIndex\n",
        "queryFrequency": "PT6H",
        "queryPeriod": "PT6H",
        "severity": "High",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Execution"
        ],
        "techniques": [
          "T1003",
          "T1569"
        ],
        "templateVersion": "1.2.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}