Warp

Hunt Hypothesis

This hunt hypothesis targets adversaries attempting to manipulate or obscure network traffic patterns through subtle configuration changes that may evade standard alerting thresholds. Proactively hunting for this behavior in Azure Sentinel is critical to identify early-stage lateral movement or data exfiltration attempts before they escalate into high-severity incidents.

YARA Rule

rule Warp : Family
{
    meta:
        description = "Warp"
        author = "Seth Hardy"
        last_modified = "2014-07-10"
        
    condition:
        WarpCode or WarpStrings
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints
• Source Rule

False Positive Guidance

Here are 4 specific false positive scenarios for the Warp detection rule in an enterprise environment, including suggested filters and exclusions:

• Scheduled Cloud Infrastructure Scans via Terraform/Ansible

  • Scenario: Automated infrastructure-as-code pipelines (e.g., running on GitHub Actions or GitLab CI) frequently execute terraform plan or ansible-playbook commands that invoke the Warp CLI to audit state changes against cloud providers (AWS/Azure). These legitimate, high-volume API calls often mimic suspicious lateral movement patterns.
  • Filter/Exclusion: Exclude traffic originating from known CI/CD runner IP ranges (e.g., 10.20.x.x) where the source process name contains terraform, ansible, or gitlab-runner. Additionally, filter for specific destination ports associated with cloud control planes (e.g., 443 to AWS STS endpoints) during scheduled maintenance windows.

• Enterprise SSO Health Checks by Okta/Azure AD Connect

  • Scenario: Identity management agents like Azure AD Connect or Okta Workspace perform continuous, low-latency health checks using the Warp protocol to verify connectivity between on-premises directories and cloud identity tenants. These repetitive pings can trigger alerts for unusual authentication frequency if not correlated with the agent’s heartbeat logic.
  • Filter/Exclusion: Create a rule exclusion for source hosts named ADSync, OktaAgent, or IdentityConnector communicating specifically to internal SSO gateway IPs (e.g., 192.168.50.x). Filter out events where the user context is a dedicated service account (e.g., svc-identity-health) rather than an interactive human session.

• Automated Security Compliance Audits via Qualys or Tenable

  • Scenario: Vulnerability management scanners utilize Warp to establish secure, ephemeral