Heimdal data reveals MediaArena adware completes persistence before antivirus quarantine finishes

**Heimdal telemetry finds MediaArena adware establishes persistence before quarantine completes.** Heimdal observed in live customer environments that MediaArena writes its persistence to disk ~21 seconds after execution while Microsoft Defender quarantine finished ~29 seconds after execution, meaning persistence is in place before quarantine completes; the pattern was seen across 40+ clients and one timed case showed signature-based detection took ~78 days to remove the hijacker, so Heimdal advises treating quarantine alerts as the start of an investigation and checking endpoints for persistence artefacts.