UltraProV10SafeNet

Hunt Hypothesis

This rule detects the presence of the UltraProV10SafeNet YARA signature, which identifies specific malicious or suspicious code patterns often associated with targeted intrusions or persistent backdoors. Proactively hunting for this indicator allows the SOC team to identify compromised assets in the Azure Sentinel environment before the adversary can establish deeper footholds or execute lateral movement.

YARA Rule

rule UltraProV10SafeNet
{
      meta:
		author="malware-lu"
strings:
		$a0 = { A1 [4] 85 C0 0F 85 3B 06 00 00 55 56 C7 05 [4] 01 00 00 00 FF 15 }

condition:
		$a0 at pe.entry_point
}

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

This rule contains 1 string patterns in its detection logic.

• Source Rule

False Positive Guidance

• Scenario: A developer or DevOps engineer runs the v10safenet CLI tool locally to validate network configuration files or simulate traffic patterns before deploying them to the production environment.
  • Filter/Exclusion: Exclude processes where the parent process is a known IDE (e.g., code.exe, idea64.exe) or build tool (e.g., msbuild.exe, gradle.exe) and the working directory is within a source control repository path (e.g., C:\Projects\, D:\Src\).
• Scenario: An automated scheduled task (e.g., DailyNetCheck) executes the UltraProV10SafeNet binary to perform routine health checks on network interfaces or validate firewall rule consistency during off-peak hours.
  • Filter/Exclusion: Exclude executions where the parent process is schtasks.exe or Task Scheduler (taskschd.msc) and the command line arguments contain specific flags associated with the health check mode (e.g., --health-check, --validate-config).
• Scenario: A security team member runs the tool in a sandboxed VM or isolated lab environment to test new detection signatures or analyze a captured packet capture file.
  • Filter/Exclusion: Exclude hosts that are tagged as “Lab” or “Sandbox” in the CMDB or asset inventory, or exclude executions where the user account belongs to a specific security group (e.g., SEC_LAB_USERS) and the process is running from a non-standard application directory (e.g., C:\LabTools\).
• Scenario: A third-party network monitoring agent (e.g., SolarWinds NPM, PRTG) bundles or invokes the UltraProV10SafeNet utility as part of its plugin ecosystem to gather detailed interface statistics.
  • **Filter