ThreatFox: Vidar IOCs

Hunt Hypothesis

This hypothesis posits that adversaries are leveraging Vidar malware to establish persistence and exfiltrate sensitive data through known indicators of compromise within the Azure environment. The SOC team should proactively hunt for these specific IOCs in Azure Sentinel to rapidly identify early-stage infections before they escalate into broader lateral movement or data theft incidents.

IOC Summary

Malware Family: Vidar Total IOCs: 2 IOC Types: url

KQL: Url Hunt

// Hunt for access to known malicious URLs
// Source: ThreatFox - Vidar
let malicious_urls = dynamic(["https://afsd.net/", "https://kayhector.com/"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc

Required Data Sources

References

• ThreatFox — Vidar

False Positive Guidance

Here are specific false positive scenarios for the ThreatFox: Vidar IOCs detection rule in an enterprise environment, along with suggested filters and exclusions:

• Antivirus Definition Updates via Windows Update or Third-Party Agents

  • Scenario: The Vidar malware family often shares code signatures or hash values with legitimate software components distributed by major antivirus vendors (e.g., Microsoft Defender, CrowdStrike Falcon, or SentinelOne). When these agents push a scheduled definition update during business hours, the installation process may spawn temporary executables matching Vidar IOCs.
  • Suggested Filter: Exclude processes where the parent executable is MsMpEng.exe (Microsoft Antimalware), CfsService.exe (CrowdStrike), or s1service.exe (SentinelOne) and the event timestamp aligns with the organization’s known patching window.

• Enterprise Software Deployment via SCCM or Intune

  • Scenario: IT administrators frequently deploy line-of-business applications using Microsoft Endpoint Configuration Manager (SCCM) or Microsoft Intune. During a scheduled deployment of a productivity suite (e.g., Office 365 updates or Adobe Creative Cloud), the deployment engine (ccmexec.exe or DeviceManagementService.exe) may extract and execute installers that contain libraries or scripts matching Vidar IOCs.
  • Suggested Filter: Create an exclusion for processes launched by ccmexec.exe, IntuneManagementExtension.exe, or TaskScheduler where the command line arguments include specific deployment identifiers (e.g., /quiet /norestart) and the user context is a known service account (e.g., DOMAIN\svc_deploy).

• Scheduled Maintenance Jobs for Backup and Data Archiving

  • Scenario: Enterprise backup solutions like Veeam Backup & Replication, Commvault, or Acronis Cyber Protect often run