ThreatFox: KongTuke IOCs

Hunt Hypothesis

This hunt targets adversary activity linked to the KongTuke threat by actively searching for six specific Indicators of Compromise (IOCs) across the Azure Sentinel environment. Proactively hunting for these signatures is critical because early detection of this high-severity threat enables the SOC team to rapidly contain potential lateral movement and data exfiltration before they escalate into a full-scale incident.

IOC Summary

Malware Family: KongTuke Total IOCs: 6 IOC Types: domain, url

KQL: Domain Hunt

// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - KongTuke
let malicious_domains = dynamic(["ackeamann.xyz"]);
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://ackeamann.xyz/file.js", "https://ackeamann.xyz/api/v1/session", "https://ackeamann.xyz/api/v1/verify", "https://ackeamann.xyz/api/v1/status", "https://datacrypt5840.top/update/package"]);
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 for the ThreatFox: KongTuke IOCs detection rule, tailored for an enterprise environment:

• Endpoint Protection Policy Updates via CrowdStrike Falcon

  • Scenario: The security operations team updates the global threat intelligence feed on CrowdStrike Falcon sensors. This process involves downloading and executing a specific signature package that contains hash values matching the KongTuke IOCs (specifically known benign DLLs used in legacy reporting tools). The execution triggers the rule during the nightly 02:00 UTC maintenance window across the “Finance-Workstations” OU.
  • Suggested Filter: Exclude alerts where the ProcessName is CortexSys.exe or FalconSensorService.exe and the ParentProcess is svchost.exe, provided the execution occurs between 01:30 UTC and 04:30 UTC.

• Scheduled Data Backup Jobs via Veeam Backup & Replication

  • Scenario: A scheduled backup job for the “HR-Database” server utilizes a custom pre-backup script to compress logs before archiving. This script invokes a legacy utility (part of the KongTuke ecosystem) that generates network connections and file writes matching the rule’s IOCs. The activity is consistent and occurs every Monday at 09:00 AM local time on the SRV-HR-DB01 host.
  • Suggested Filter: Create an exclusion for the specific Source IP of SRV-HR-DB01 combined with a filter on the CommandLine argument containing -backup-mode, or exclude the specific file hash if it matches the known benign signature stored in the asset inventory.

• Software Deployment via Microsoft SCCM (Configuration Manager)

  • Scenario: The IT deployment team pushes a mandatory patch for an internal analytics tool using Microsoft