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EntraFalcon is a powerful offensive tool designed to enumerate Entra ID (formerly Azure AD) objects and their assignments. With complex cloud environments containing thousands of objects, automated detection becomes essential. Below is a KQL (Kusto Query Language) detection query for Microsoft Sentinel to identify potential EntraFalcon activity.
You Should Know:
1. KQL Sentinel Detection Query
let timeframe = 7d;
SecurityEvent
| where TimeGenerated >= ago(timeframe)
| where EventID == 4624 // Successful logon
| where AccountType == "User"
| where LogonType == 3 // Network logon
| where IPAddress has_any ("1.2.3.4", "5.6.7.8") // Replace with suspicious IPs
| extend UserAgent = tostring(parse_json(AdditionalFields).UserAgent)
| where UserAgent contains "EntraFalcon"
| project TimeGenerated, AccountName, IPAddress, UserAgent, LogonType
2. PowerShell Command to Monitor Entra ID Changes
Get-AzureADAuditDirectoryLogs -Filter "InitiatedBy contains 'EntraFalcon'" -Top 100
3. Linux Command to Check Suspicious API Calls
journalctl -u azuread-sync --since "1 hour ago" | grep -i "unusual_enumeration"
4. Windows Defender Advanced Hunting Query
DeviceNetworkEvents | where RemoteUrl contains "entrafalcon" | where ActionType == "ConnectionSuccess" | project Timestamp, DeviceName, RemoteUrl, InitiatingProcessCommandLine
5. Mitigation Steps
- Restrict API Permissions:
Set-AzureADApplication -ObjectId <AppId> -RequiredResourceAccess @()
- Enable Conditional Access Policies:
New-AzureADMSConditionalAccessPolicy -DisplayName "Block EntraFalcon" -State "Enabled" -Conditions @{}
What Undercode Say:
EntraFalcon poses a significant reconnaissance risk in Azure environments. Proactive detection using KQL, PowerShell, and Defender queries is critical. Implementing strict API permissions and monitoring unusual enumeration patterns can mitigate exposure.
Expected Output:
- Suspicious logon events with EntraFalcon UserAgent.
- Unusual API calls from unrecognized IPs.
- Azure AD audit logs showing mass object enumeration.
Prediction:
As cloud environments grow, automated reconnaissance tools like EntraFalcon will evolve, requiring more advanced behavioral detection in Microsoft Sentinel and Defender.
Relevant URLs:
References:
Reported By: 0x534c Cybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
