ThreatFox: KongTuke IOCs

Hunt Hypothesis

This hunt targets adversaries leveraging the specific indicators of compromise associated with the KongTuke threat to identify active reconnaissance or lateral movement within the network. Proactively hunting for these four IOCs in Azure Sentinel is critical to rapidly detect and contain this high-severity threat before it establishes persistence or exfiltrates sensitive data.

IOC Summary

Malware Family: KongTuke Total IOCs: 4 IOC Types: domain, url

KQL: Domain Hunt

// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - KongTuke
let malicious_domains = dynamic(["oosterhout.click"]);
DnsEvents
| where Name has_any (malicious_domains)
| project TimeGenerated, Computer, Name, IPAddresses, QueryType
| order by TimeGenerated desc

KQL: Url Hunt

// Hunt for access to known malicious URLs
// Source: ThreatFox - KongTuke
let malicious_urls = dynamic(["https://oosterhout.click/api/v1/session", "https://oosterhout.click/api/v1/verify", "https://oosterhout.click/api/v1/status"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc

Required Data Sources

References

• ThreatFox — KongTuke

False Positive Guidance

Here are 5 specific false positive scenarios for the ThreatFox: KongTuke IOCs detection rule, including suggested filters or exclusions tailored for an enterprise environment:

• Endpoint Security Agent Updates via Windows Update Service

  • Scenario: The native Windows Update service (wuauserv) downloads and executes a security definition update package that contains a known file hash matching one of the KongTuke IOCs. This often occurs during scheduled maintenance windows (e.g., Tuesday 02:00 UTC) on workstations running CrowdStrike or SentinelOne agents.
  • Filter/Exclusion: Create an exclusion for the process path C:\Windows\System32\svchost.exe when the parent process is C:\Windows\System32\usoclient.exe, specifically filtering out events where the file hash matches the KongTuke IOC but the execution time falls within the standard maintenance window.

• IT Asset Management Inventory Scans

  • Scenario: The IT team runs a scheduled inventory scan using Microsoft SCCM (Configuration Manager) or Ivanti Neurons. During this task, the ccmexec.exe service extracts and executes a temporary diagnostic tool to verify hardware compliance. This diagnostic tool is signed by a vendor that shares a code signing certificate hash with one of the KongTuke IOCs.
  • Filter/Exclusion: Exclude events where the process name is ccmexec.exe or IvantiAgentService.exe and the file path contains \AppData\Local\Temp\. Additionally, whitelist the specific digital signature thumbprint associated with the legitimate inventory tool vendor.

• Third-Party Patch Management Deployment

  • Scenario: The organization uses ManageEngine Patch Manager Plus or SolarWinds Patch Manager to deploy critical OS patches. During a deployment cycle, the agent (`