MacromediaWindowsFlashProjectorPlayerv30

Hunt Hypothesis

This detection identifies the execution of legacy Macromedia Flash Projector binaries, which may indicate an adversary leveraging outdated software components to establish a foothold or execute malicious payloads within the environment. Proactive hunting for this behavior is essential because these legacy applications often contain unpatched vulnerabilities that attackers can exploit to bypass standard security controls and maintain persistence on endpoints monitored by Azure Sentinel.

YARA Rule

rule MacromediaWindowsFlashProjectorPlayerv30
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 55 8B EC 83 EC 44 56 FF 15 94 13 42 00 8B F0 B1 22 8A 06 3A C1 75 13 8A 46 01 46 3A C1 74 04 84 C0 75 F4 38 0E 75 0D 46 EB 0A 3C 20 7E 06 }

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

Here are 5 specific false positive scenarios for the MacromediaWindowsFlashProjectorPlayerv30 detection rule, including suggested filters and exclusions:

• Legacy Content Management System (CMS) Deployment

  • Scenario: An enterprise utilizing an older version of Adobe Experience Manager (AEM) or a custom internal portal relies on the legacy Flash projector to render embedded training modules and interactive dashboards. When users access these specific pages, the FlashProjector.exe process is spawned automatically by the browser plugin or the CMS backend service.
  • Filter/Exclusion: Create an exclusion for the file path of the known legitimate installation directory (e.g., C:\Program Files\Adobe\Adobe Flash Player Projector\). Additionally, filter alerts where the parent process is a known web server service (e.g., httpd.exe or w3wp.exe) rather than a user shell like explorer.exe.

• Scheduled Automated Reporting Job

  • Scenario: The Finance department runs a nightly scheduled task using Microsoft Task Scheduler to generate interactive PDF reports containing embedded Flash charts. This job invokes the Flash Projector executable (FlashProjector.exe) in headless mode to render the graphics before saving the final document.
  • Filter/Exclusion: Exclude alerts where the command line arguments contain specific flags indicating a batch or headless operation (e.g., --headless, --render-only). Alternatively, add an exclusion for the specific user account running the job (e.g., DOMAIN\Finance-Reporting-SVC) during the scheduled execution window (02:00 – 04:00).

• Internal HR Training Portal Access

  • Scenario: Employees accessing the internal “LMS-Portal” to complete mandatory compliance training modules. The portal utilizes a legacy Flash projector component to play video lectures and interactive quizzes