ThreatFox: KongTuke IOCs

Hunt Hypothesis

This detection identifies adversary activity linked to the KongTuke malware by monitoring for four specific indicators of compromise within Azure Sentinel logs. Proactively hunting for these IOCs is critical because KongTuke represents a sophisticated threat capable of establishing persistent footholds in cloud environments, necessitating early identification to prevent lateral movement and data exfiltration.

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(["yelahaye.surf"]);
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://yelahaye.surf/api/v1/verify", "https://yelahaye.surf/api/v1/session", "https://yelahaye.surf/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 specific false positive scenarios and corresponding exclusion strategies for the ThreatFox: KongTuke IOCs detection rule in an enterprise environment:

• Scenario 1: Automated Backup and Archiving Jobs

  • Context: Enterprise backup solutions like Veeam Backup & Replication or Commvault often utilize specific hashing algorithms or network signatures during the “snapshot” phase that match KongTuke’s file hash IOCs. These jobs typically run nightly via Windows Task Scheduler.
  • Filter/Exclusion: Create a rule exclusion based on the Process Name (e.g., Veeam.Backup.Service.exe) and Parent Process (TaskScheduler.exe). Additionally, exclude traffic originating from specific backup server IP ranges during defined maintenance windows (e.g., 02:00–04:00 UTC).

• Scenario 2: Endpoint Protection Scanning Activities

  • Context: Next-generation antivirus platforms such as CrowdStrike Falcon, Microsoft Defender for Endpoint, or SentinelOne frequently generate network connections and file access patterns that mimic the IOCs associated with KongTuke. This often occurs during on-access scanning of large document repositories or during signature definition updates pushed by the admin console.
  • Filter/Exclusion: Exclude events where the Initiating Process matches known EDR agents (e.g., Cns.exe, MsMpEng.exe) and the Destination Port aligns with standard update ports (443, 80). Implement a whitelist for specific file paths used by these agents’ quarantine folders.

• Scenario 3: Software Deployment and Patching Tools

  • Context: IT administrators using deployment tools like Microsoft SCCM (Configuration Manager) or Ivanti Neurons to push application updates often trigger network connections that overlap with KongT