ThreatFox: Kimwolf IOCs

Hunt Hypothesis

This hypothesis posits that adversaries are actively leveraging known Kimwolf indicators of compromise to establish persistence and execute data exfiltration within the Azure environment. A proactive hunt is essential to identify early-stage infections by correlating these specific IOCs against real-time telemetry, thereby preventing potential lateral movement before broader network impact occurs.

IOC Summary

Malware Family: Kimwolf Total IOCs: 3 IOC Types: ip:port

KQL: Ip Hunt

// Hunt for network connections to known malicious IPs
// Source: ThreatFox - Kimwolf
let malicious_ips = dynamic(["209.38.109.169", "64.227.76.201", "164.92.149.181"]);
CommonSecurityLog
| where DestinationIP in (malicious_ips) or SourceIP in (malicious_ips)
| project TimeGenerated, SourceIP, DestinationIP, DestinationPort, DeviceAction, Activity
| order by TimeGenerated desc

KQL: Ip Hunt Device

// Hunt in Defender for Endpoint network events
let malicious_ips = dynamic(["209.38.109.169", "64.227.76.201", "164.92.149.181"]);
DeviceNetworkEvents
| where RemoteIP in (malicious_ips)
| project Timestamp, DeviceName, RemoteIP, RemotePort, InitiatingProcessFileName, ActionType
| order by Timestamp desc

Required Data Sources

References

• ThreatFox — Kimwolf

False Positive Guidance

Here are 5 specific false positive scenarios for the ThreatFox: Kimwolf IOCs detection rule, along with targeted filters and exclusions suitable for an enterprise environment:

• Scenario: Scheduled Antivirus Definition Updates via GPO

  • Context: Enterprise endpoints running Microsoft Defender Antivirus or Symantec Endpoint Protection often receive definition updates pushed via Group Policy. These updates frequently include hash values or file paths that overlap with the Kimwolf IOC list, particularly if the vendor uses a shared infrastructure for signature delivery.
  • Filter/Exclusion: Create an exclusion rule based on the specific process name of the update service (e.g., MsMpEng.exe or Rtvscan64.exe) and restrict it to the specific IP range of the internal update server (e.g., 10.20.5.x). Alternatively, exclude file paths matching the known update directory structure (e.g., C:\ProgramData\Microsoft\Windows Defender\Updates).

• Scenario: Automated Patch Deployment by SCCM/Intune

  • Context: During monthly maintenance windows, Microsoft Endpoint Configuration Manager (SCCM) or Microsoft Intune deploys patches to thousands of workstations. The deployment agents often generate temporary files or network connections that match the Kimwolf IOCs, especially if the patching solution utilizes a third-party repository that shares infrastructure with the threat intelligence feed.
  • Filter/Exclusion: Filter alerts where the initiating process is ccmsetup.exe (SCCM) or IntuneManagementExtension.exe. Add a time-based exclusion window corresponding to the organization’s standard maintenance hours (e.g., Sunday 02:00 – Saturday 06:00 UTC).

• Scenario: Internal Backup and Archiving Jobs

  • Context: Enterprise backup solutions like **Veeam