Suspicious Registry Modifications

# --- Query Metadata ---
# Human-readable name for the query. Will be displayed as the title.
name: Suspicious Registry Modifications

# MITRE ATT&CK technique IDs
mitre_ids:
  - T1112
  - T1547.001

# Description of what the query does and its purpose.
description: This query detects suspicious registry modifications that could indicate persistence mechanisms or system configuration tampering by attackers.

# The author or team that created the query.
author: ByteRay GmbH

# The required log sources to run this query successfully in Next-Gen SIEM.
# This will be displayed in the UI to inform the user.
log_sources:
  - Endpoint

# Tags for filtering and categorization.
tags:
  - Hunting

cs_required_modules: 
  - Insight
  - Identity

# --- Query Content ---
# The actual CrowdStrike Query Language (CQL) code.
# Using the YAML block scalar `|` allows for multi-line strings.
cql: |
  #event_simpleName=RegGenericValue 
  | RegObjectName=/\\(Run|RunOnce|Winlogon|AppInit_DLLs|Image File Execution Options)/i
  | RegValueName!=/^(ctfmon|SecurityHealth|OneDrive)$/i
  | join({#event_simpleName=UserIdentity}, field=AuthenticationID, include=[UserName])
  | table([aid, UserName, RegObjectName, RegValueName, RegStringValue, ProcessImageFileName])

# Explanation of the query.
# Using the YAML block scalar `|` allows for multi-line strings.
# Uses markdown for formatting on the webpage.
explanation: |
  This query uses CrowdStrike Query Language (CQL) to detect suspicious registry modifications:

  1. **Event Filtering**: `#event_simpleName=RegGenericValue`
     - Searches for registry value modification events

  2. **High-Risk Keys**: `RegObjectName=/\\(Run|RunOnce|Winlogon|AppInit_DLLs|Image File Execution Options)/i`
     - Focuses on common persistence and execution registry locations

  3. **Exclude Legitimate**: `RegValueName!=/^(ctfmon|SecurityHealth|OneDrive)$/i`
     - Filters out known legitimate applications

  4. **User Context**: `join({#event_simpleName=UserIdentity}, field=AuthenticationID, include=[UserName])`
     - Enriches results with username information

  5. **Output**: `table([aid, UserName, RegObjectName, RegValueName, RegStringValue, ProcessImageFileName])`
     - Displays registry path, value, and modifying process