ThreatFox: KongTuke IOCs

Hunt Hypothesis

This detection identifies adversary activity associated with the KongTuke malware, which targets cloud environments to establish persistence and exfiltrate sensitive data through known indicators of compromise. A proactive hunt in Azure Sentinel is essential to rapidly isolate affected workloads and prevent lateral movement before the malware can fully entrench itself within the organization’s infrastructure.

IOC Summary

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

KQL: Domain Hunt

// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - KongTuke
let malicious_domains = dynamic(["rodrigeez.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://gonznlez.surf/api/v1/status", "https://rodrigeez.surf/api/v1/session", "https://rodrigeez.surf/api/v1/verify"]);
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 3-5 specific false positive scenarios for the ThreatFox: KongTuke IOCs detection rule, including suggested filters and exclusions tailored for a legitimate enterprise environment:

• Scenario: Automated Backup Agent Scanning

  • Context: Enterprise backup solutions like Veeam Backup & Replication or Commvault frequently scan the entire file system to identify new or modified files. During these scans, the agents often generate temporary hash values and network connections that mimic the behavior of KongTuke’s initial reconnaissance phase (specifically its interaction with local directories and registry keys).
  • Filter/Exclusion: Create a rule exclusion for the specific process names VeeamService.exe and commvault_agent.exe. Additionally, exclude traffic originating from the dedicated backup VLAN subnet (e.g., 10.20.50.x) to prevent scanning artifacts from triggering the alert.

• Scenario: Scheduled PowerShell Inventory Script

  • Context: IT Operations teams often run nightly scheduled jobs using Windows Task Scheduler to execute PowerShell scripts for asset inventory or compliance auditing. These scripts frequently query the HKLM\Software registry hive and enumerate file permissions, which can trigger KongTuke’s detection logic regarding unauthorized registry modifications and file system enumeration.
  • Filter/Exclusion: Exclude alerts where the parent process is powershell.exe launched by a known service account (e.g., DOMAIN\svc-inventory). Implement a filter to ignore events occurring during specific maintenance windows (e.g., 02:00–04:00 UTC) on non-critical workstations.

• Scenario: Endpoint Detection and Response (EDR) Self-Scanning

  • Context: Native EDR agents such as CrowdStrike Falcon, SentinelOne, or Microsoft Defender for Endpoint perform