T1216 — System Script Proxy Execution

# T1216 - System Script Proxy Execution

## SOC Recommendation
Investigate System Script Proxy Execution activity in the context of Stealth: confirm scope, affected host/identity, and whether it matches expected administrative behaviour before deciding this is benign.

## D3FEND Mappings
| D3FEND Technique | Relationship | Practical SOC Action |
|---|---|---|
| Network Traffic Analysis | Detect | Monitor for Network Traffic Analysis indicators relevant to this technique. |

## Investigation Steps
1. Review Defender for Endpoint / Defender XDR alerts and timeline for the affected host or identity.
2. Check Sentinel analytics rules and incidents correlated with this technique.
3. Review Entra ID sign-in and audit logs if the technique involves an identity or cloud resource.

## Evidence to Collect
- Host or resource affected
- Account or identity involved
- Timestamp of the activity
- Related process, file, or network artifact
- Any preceding or follow-on alerts

## Response Actions
| Action | Risk | Automation Safe | Approval Required |
|---|---|---|---|
| Contain the affected host or account | Medium | No | Yes |
| Collect and preserve evidence | Low | Yes | No |

## KQL
```kql
DeviceEvents
| where TimeGenerated > ago(24h)
| where ActionType has "<tune to T1216>"
```

## Escalation Criteria
- System Script Proxy Execution activity observed on a privileged account or critical system.
- Activity follows or precedes other suspicious behaviour in the same investigation.
- Automated triage cannot confidently rule out malicious intent.

## False Positive Considerations
- Legitimate administrative or maintenance activity matching this pattern.
- Approved security testing or red team exercise.
- Known benign software producing similar telemetry.

Generated by SOC Response Atlas by Basyrix.

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• /api/techniques/T1216.json
• /api/recommendations/T1216.json
• /api/d3fend/T1216.json
• /api/mappings/T1216.json
• /api/confluence/T1216.md

Example curl:

curl https://atlas.basyrix.com/api/recommendations/T1216.json

Response:

{
  "technique_id": "T1216",
  "name": "System Script Proxy Execution",
  "priority": "low",
  "status": "draft",
  "version": "0.1.0",
  "last_reviewed": "2026-07-23",
  "generated_by": "SOC Response Atlas by Basyrix",
  "tactics": [
    "Stealth"
  ],
  "platforms": [
    "Windows"
  ],
  "summary": "Adversaries may use trusted scripts, often signed with certificates, to proxy the execution of malicious files. Several Microsoft signed scripts that have been downloaded from Microsoft or are default on Windows installations can be used to proxy execution of other files. This behavior may be abused by adversaries to execute malicious files that could bypass application control and signature validation on systems.",
  "soc_recommendation": "Investigate System Script Proxy Execution activity in the context of Stealth: confirm scope, affected host/identity, and whether it matches expected administrative behaviour before deciding this is benign.",
  "d3fend_mappings": [
    {
      "id": "D3-NTA",
      "name": "Network Traffic Analysis",
      "relationship": "detect",
      "practical_action": "Monitor for Network Traffic Analysis indicators relevant to this technique.",
      "tooling": [
        "Sentinel",
        "Defender for Endpoint"
      ]
    }
  ],
  "investigation_steps": {
    "microsoft": [
      "Review Defender for Endpoint / Defender XDR alerts and timeline for the affected host or identity.",
      "Check Sentinel analytics rules and incidents correlated with this technique.",
      "Review Entra ID sign-in and audit logs if the technique involves an identity or cloud resource."
    ],
    "generic": [
      "Confirm whether the observed system script proxy execution activity matches expected administrative or application behaviour.",
      "Identify the host, account, or resource where the activity occurred and its business criticality.",
      "Check for related alerts before and after this activity to reconstruct the broader intrusion timeline.",
      "Real detection reference: \"Delayed Execution via Ping\" -- Identifies the execution of commonly abused Windows utilities via a delayed Ping execution. This behavior is often observed during malware installation and is consistent with an attacker attempting to evade detection."
    ]
  },
  "evidence_to_collect": [
    "Host or resource affected",
    "Account or identity involved",
    "Timestamp of the activity",
    "Related process, file, or network artifact",
    "Any preceding or follow-on alerts"
  ],
  "response_actions": [
    {
      "name": "Contain the affected host or account",
      "category": "Containment",
      "risk": "Medium",
      "automation_safe": false,
      "approval_required": true,
      "tool": "Defender for Endpoint / Entra ID",
      "notes": "Requires approval -- confirm malicious intent before isolating a host or disabling an account."
    },
    {
      "name": "Collect and preserve evidence",
      "category": "Investigation",
      "risk": "Low",
      "automation_safe": true,
      "approval_required": false,
      "tool": "Defender for Endpoint",
      "notes": "Safe -- read-only evidence collection."
    }
  ],
  "queries": {
    "kql": [
      {
        "name": "Starting point for T1216",
        "description": "Generic starting query -- tune to the specific data source relevant to this technique.",
        "query": "DeviceEvents\n| where TimeGenerated > ago(24h)\n| where ActionType has \"<tune to T1216>\""
      }
    ],
    "spl": [],
    "esql": [
      {
        "name": "e00b8d49-632f-4dc6-94a5-76153a481915 — Delayed Execution via Ping",
        "description": "(EQL) Identifies the execution of commonly abused Windows utilities via a delayed Ping execution. This behavior is often observed during malware installation and is consistent with an attacker attempting to evade detection. (Source: Elastic's official detection-rules repository (Elastic License v2).)",
        "query": "sequence by process.parent.entity_id with maxspan=1m\n  [process where host.os.type == \"windows\" and event.action == \"start\" and process.name : \"ping.exe\" and\n   process.args : \"-n\" and process.parent.name : \"cmd.exe\" and not user.id : \"S-1-5-18\"]\n  [process where host.os.type == \"windows\" and event.action == \"start\" and\n   process.parent.name : \"cmd.exe\" and\n   (\n        process.name : (\n            \"rundll32.exe\", \"powershell.exe\",\n            \"mshta.exe\", \"msbuild.exe\",\n            \"certutil.exe\", \"regsvr32.exe\",\n            \"powershell.exe\", \"cscript.exe\",\n            \"wscript.exe\", \"wmic.exe\",\n            \"installutil.exe\", \"msxsl.exe\",\n            \"Microsoft.Workflow.Compiler.exe\",\n            \"ieexec.exe\", \"iexpress.exe\",\n            \"RegAsm.exe\", \"installutil.exe\",\n            \"RegSvcs.exe\", \"RegAsm.exe\"\n        ) or\n        (process.executable : \"?:\\\\Users\\\\*\\\\AppData\\\\*.exe\" and not process.code_signature.trusted == true)\n    ) and\n\n    not process.args : (\"?:\\\\Program Files\\\\*\", \"?:\\\\Program Files (x86)\\\\*\") and\n    not (process.name : (\"openssl.exe\", \"httpcfg.exe\", \"certutil.exe\") and process.parent.command_line : \"*ScreenConnectConfigurator.cmd*\") and\n    not (process.pe.original_file_name : \"DPInst.exe\" and process.command_line : \"driver\\\\DPInst_x64  /f \") and\n    not (process.name : \"powershell.exe\" and process.args : \"Write-Host ======*\") and\n    not (process.name : \"wscript.exe\" and process.args : \"launchquiet_args.vbs\" and process.parent.args : \"?:\\\\Windows\\\\TempInst\\\\7z*\") and\n    not (process.name : \"regsvr32.exe\" and process.args : (\"?:\\\\windows\\\\syswow64\\\\msxml?.dll\", \"msxml?.dll\", \"?:\\\\Windows\\\\SysWOW64\\\\mschrt20.ocx\")) and\n    not (process.name : \"wscript.exe\" and\n         process.working_directory :\n                    (\"?:\\\\Windows\\\\TempInst\\\\*\",\n                     \"?:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\BackupBootstrapper\\\\Logs\\\\\",\n                     \"?:\\\\Users\\\\*\\\\AppData\\\\Local\\\\Temp\\\\QBTools\\\\\"))\n    ]"
      }
    ]
  },
  "automation": {
    "safe": [
      "Add recommendation as Sentinel incident comment.",
      "Run enrichment queries.",
      "Create ServiceNow SecOps task."
    ],
    "approval_required": [
      "Contain or disable the affected host/account.",
      "Any change to production configuration."
    ]
  },
  "escalation_criteria": [
    "System Script Proxy Execution activity observed on a privileged account or critical system.",
    "Activity follows or precedes other suspicious behaviour in the same investigation.",
    "Automated triage cannot confidently rule out malicious intent."
  ],
  "false_positive_considerations": [
    "Legitimate administrative or maintenance activity matching this pattern.",
    "Approved security testing or red team exercise.",
    "Known benign software producing similar telemetry."
  ],
  "confluence": {
    "title": "T1216 - System Script Proxy Execution Response Guidance",
    "labels": [
      "mitre",
      "attack",
      "d3fend",
      "secops",
      "basyrix"
    ],
    "sections": [
      "summary",
      "d3fend_mappings",
      "investigation_steps",
      "response_actions",
      "queries",
      "automation",
      "escalation_criteria",
      "false_positive_considerations"
    ]
  }
}