cloudfusion me

Hunt Hypothesis

The hypothesis is that the detected behavior may indicate an adversary attempting to exploit a compromised cloud service account to move laterally within an Azure environment. A SOC team should proactively hunt for this behavior to identify potential unauthorized access and lateral movement attempts that could lead to deeper compromise.

YARA Rule

rule cloudfusion_me {
    strings: $ = "cloudfusion.me"
    condition: any of them
}

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

• Scenario: Legitimate scheduled backup job using Veeam Backup & Replication
  Filter/Exclusion: process.name != "vbm" OR process.name != "vbackup"

• Scenario: System administrator running PowerShell scripts for cloud configuration management
  Filter/Exclusion: process.name != "powershell.exe" OR process.args NOT LIKE "*cloudfusion*"

• Scenario: AWS CloudFormation template deployment via the AWS CLI
  Filter/Exclusion: process.name != "aws" OR process.args NOT LIKE "*cloudformation*"

• Scenario: Ansible playbook execution for cloud infrastructure provisioning
  Filter/Exclusion: process.name != "ansible" OR process.args NOT LIKE "*cloudfusion*"

• Scenario: Terraform apply command to provision cloud resources
  Filter/Exclusion: process.name != "terraform" OR process.args NOT LIKE "*apply*"