Azure Kusto Irql

# IRQL -- Incident Response Query Language

Compose IRQL function pipelines from selector, extractor, and enricher building blocks. IRQL wraps raw KQL security tables behind intent-revealing, composable functions so analysts (and LLMs) can express hunts without memorizing schemas, cluster locations, or join keys.

## Activation Triggers

Use this skill when the user: - Explicitly mentions IRQL, `Get_*`, `Extract_*`, or `Enrich_*` functions - Says "use IRQL" or "write an IRQL query" - Requests a composable hunting pipeline using known IRQL selectors

Do **not** activate for generic security queries (e.g. "find failed logins") unless the user explicitly asks for IRQL. Route those to `azure-kusto` instead.

**Not a natural-language-to-IRQL converter.** This skill composes IRQL function pipelines and may handle basic natural-language requests that map directly to known selectors and simple filters. For general NL-to-KQL or NL-to-IRQL conversion, use a dedicated query-generation skill (available separately).

## IRQL Function Preflight

Before generating a pipeline, verify IRQL is available on the target database:

```kql .show functions | where Name startswith "Get_" or Name startswith "Extract_" or Name startswith "Enrich_" | project Name ```

If no IRQL functions are found, inform the user that IRQL is not deployed on the target database and suggest using `azure-kusto` for raw KQL queries instead. IRQL functions are a prerequisite -- this skill does not deploy base IRQL selectors.

## What IRQL Is

IRQL is a **function-based dialect on top of KQL**. It provides:

1. **Unified schema** -- disparate security tables project into consistent column names regardless of the underlying data source 2. **Composability** -- small functions chain via `| invoke` to build complex hunts from simple steps 3. **Portability** -- the same IRQL pipeline works across different clusters/databases; only the `Get_*` primitives need re-pointing

IRQL is not a separate language. It's KQL functions you invoke. Any valid KQL works alongside IRQL functions.

## Deploying IRQL

IRQL functions are stored KQL functions (`.create-or-alter function`). They must already be deployed to the target database before this skill can generate pipelines.

**Public example cluster** (functions pre-deployed): - Cluster: `https://kc7001.eastus.kusto.windows.net` - Databases: `ValdyTimes`, `JoJosHospital`

To port IRQL to a new cluster/database, create `Get_*` selectors that project your source tables into the unified schema (column names below), then deploy extractors and enrichers. The extractors and enrichers work unchanged as long as the input schema matches.

## Function Catalog

### 1. Selectors -- `Get_*`

Return projected, schema-unified views of source tables. Use the minimal form by default; use `_All` when extra columns are needed.

| Function | Columns | |---|---| | `Get_Event_Authentication` | `EnvTime`, `Hostname`, `ClientIp`, `Username`, `Result` | | `Get_Event_Authentication_All` | + `Description`, `UserAgent`, `PasswordHash` | | `Get_Email` | `EnvTime`, `EmailSender`, `EmailRecipient`, `Subject`, `Url` | | `Get_Email_All` | + `ReplyTo`, `Verdict` | | `Get_Employees` | `Name`, `ClientIp`, `Email`, `Username`, `Hostname`, `Role` | | `Get_Employees_All` | + `HireDate`, `UserAgent`, `Domain` | | `Get_Event_FileCreation` | `EnvTime`, `Hostname`, `Filename`, `Path` | | `Get_Event_FileCreation_All` | + `Username`, `Sha256`, `ProcessName` | | `Get_Event_NetworkInbound` | `EnvTime`, `ClientIp`, `Url` | | `Get_Event_NetworkInbound_All` | + `Method`, `UserAgent`, `StatusCode` | | `Get_Event_NetworkOutbound` | `EnvTime`, `ClientIp`, `Url` | | `Get_Event_NetworkOutbound_All` | + `Method`, `UserAgent` | | `Get_Dns_All` | `EnvTime`, `Domain`, `ClientIp` | | `Get_Event_Process` | `EnvTime`, `ProcessCommandLine`, `ProcessName`, `Hostname`, `Username` | | `Get_Event_Process_All` | + `ParentProcessName`, `ParentProcessHash`, `ProcessHash` | | `Get_SecurityAlerts_All` | `EnvTime`, `AlertType`, `Severity`, `Description`, `Indicators` | | `Get_Network_Connection_All` | `EnvTime`, `SourceIp`, `SourcePort`, `DestinationIp`, `DestinationPort`, `Protocol`, `Bytes` |

### 2. Extractors -- `Extract_*`

Derive a new column from an existing one. Invoke after a selector.

| Function | Input Column | Adds | |---|---|---| | `Extract_Email_Sender_Domain(T)` | `EmailSender` | `Domain` | | `Extract_Employee_Firstname(T)` | `Name` | `Firstname` | | `Extract_Event_Network_Domain(T)` | `Url` | `DomainName` |

### 3. Enrichers -- `Enrich_*`

Left-join helpers that attach context from a related table.

| Function | Key Column | Enriches With | |---|---|---| | `Enrich_Event_Authentication_Username(T)` | `Username` | Auth events for user | | `Enrich_Ip_Employee(T)` | `ClientIp` | Employee identity from IP | | `Enrich_Username_Employee(T)` | `Username` | Employee identity from username | | `Enrich_Ip_Domain(T)` | `ClientIp` | DNS domains resolved to IP | | `Enrich_Ip_Event_NetworkO