SMB Enumeration | Defender for Identity

# --- Query Metadata ---
# Human-readable name for the query. Will be displayed as the title.
name: SMB Enumeration | Defender for Identity

# MITRE ATT&CK technique IDs
mitre_ids:
  - T1135

# Description of what the query does and its purpose.
description: |
  This detection query will detect SMB Enumeration based on the Microsoft defender for Identity Module

# The author or team that created the query.
author: Kundan Kumar

# The required log sources to run this query successfully in Next-Gen SIEM.
log_sources:
  - Identity

# The CrowdStrike modules required to run this query.
cs_required_modules:
  - Identity

# Tags for filtering and categorization.
tags:
  - Detection

# --- Query Content ---
# The actual CrowdStrike Query Language (CQL) code.
# Using the YAML block scalar `|` allows for multi-line strings.
cql: |
  #Vendor = "microsoft"
  | #event.module = "defender-identity"
  | Vendor.category = "AdvancedHunting-IdentityDirectoryEvents"
  | event.action = "smb session"
  | #event.outcome = "success"
  | groupBy([user.name, source.address],function=[count(as=smb_sessions),count(field=Vendor.properties.DestinationDeviceName, distinct=true, as=unique_destinations),collect(fields=Vendor.properties.DestinationDeviceName),collect(fields=Vendor.properties.AdditionalFields.DestinationComputerOperatingSystem),min(@timestamp, as=start_time),max(@timestamp, as=end_time)])
  | unique_destinations >= 3
  | time_diff_min := (end_time - start_time) / 60000
  | time_diff_min <= 10
  | start_time_fmt := formatTime("%Y-%m-%d %H:%M:%S", field=start_time, timezone="UTC")
  | end_time_fmt := formatTime("%Y-%m-%d %H:%M:%S", field=end_time, timezone="UTC")
  | drop([start_time, end_time])
  | sort([unique_destinations], order=desc)