Azure Anomalous App Service WebJob Activity

Triggers

• Unusual creation or modification of Azure App Service WebJob configurations.
• Frequent or repetitive execution of WebJobs with unknown or suspicious triggers.
• Changes to existing WebJobs that could indicate malicious intent.

Possible Root Causes

• Compromised Identity: An attacker has gained access to an identity and is attempting to deploy a malicious application.
• Unauthorized Modifications: An unauthorized user or service principal is creating or modifying WebJobs with elevated permissions.
• Misconfigured or Compromised Resources: Security gaps in Azure resources are leading to unexpected WebJob behavior.
• Insufficient Monitoring: Inadequate security controls allow suspicious activity to go undetected.
• Legitimate Development Activity: A developer is creating or modifying a WebJob as part of a valid application deployment or maintenance process.

Business Impact

• Data breaches and unauthorized access to sensitive information.
• Denial-of-Service (DoS) attacks or resource exhaustion due to malicious code execution.
• Compliance and regulatory risks due to security vulnerabilities.
• Unintended changes to production data or systems caused by untested or unauthorized WebJobs.

Steps to Verify

• Investigate the Azure Resource Group or Subscription: Review the environment where suspicious WebJob activity was detected.
• Analyze Azure Activity Logs: Look for anomalies in WebJob creation, modification, or execution.
• Inspect WebJob Configurations and Code: Check for signs of malicious intent, unauthorized access, or suspicious behavior.
• Review User and Service Principal Permissions: Ensure that only authorized identities have the ability to create or modify WebJobs.