ThreatFox: Unknown malware IOCs

Hunt Hypothesis

The ThreatFox: Unknown malware IOCs rule detects potential adversary activity involving unknown malicious indicators that may be associated with advanced persistent threats. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate emerging threats before they cause significant damage.

IOC Summary

Malware Family: Unknown malware Total IOCs: 2 IOC Types: url

KQL: Url Hunt

// Hunt for access to known malicious URLs
// Source: ThreatFox - Unknown malware
let malicious_urls = dynamic(["https://sipapudemo.xyz/", "https://lebnannews.com/"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc

Required Data Sources

References

• ThreatFox — Unknown malware

False Positive Guidance

• Scenario: A system administrator is using PowerShell to run a scheduled job that downloads a legitimate update from a trusted source.
  Filter/Exclusion: Exclude PowerShell scripts that use Invoke-WebRequest or Start-Process with known trusted URLs (e.g., https://download.microsoft.com).

• Scenario: A database administrator is using SQL Server Agent to execute a job that connects to a remote database using a known IP address.
  Filter/Exclusion: Exclude connections to IP addresses associated with known database servers (e.g., 10.10.10.10 or 192.168.1.5).

• Scenario: A DevOps engineer is using Ansible to deploy a configuration script that includes a legitimate binary file from a private artifact repository.
  Filter/Exclusion: Exclude file hashes or IP addresses associated with internal artifact repositories (e.g., 10.20.30.40 or artifactory.example.com).

• Scenario: A security analyst is using Wireshark to capture and analyze network traffic for a penetration test, including a known malicious payload for testing purposes.
  Filter/Exclusion: Exclude traffic originating from or destined to a test environment (e.g., 192.168.50.0/24 or test-vm.example.com).

• Scenario: A system administrator is using Windows Task Scheduler to run a script that connects to a remote server for log collection, using a legitimate remote management tool like Powershell Remoting.
  Filter/Exclusion: Exclude connections to known remote management hosts (e.g., 10.10.10.20 or management.example.com).