The Play ransomware group has significantly evolved its attack methodology, introducing a sophisticated multi-stage process designed to cripple enterprise defenses before deploying its final payload. According to a detailed technical analysis by cybersecurity firm Halcyon, the threat actors now systematically target and disable Endpoint Detection and Response (EDR) and Endpoint Protection Platform (EPP) solutions using a novel technique that abuses the legitimate Windows Disk Manager utility (`diskmgmt.msc`). This move represents a deliberate escalation in the ongoing arms race between ransomware operators and security teams, focusing on the pre-encryption phase to ensure operational success.
The core of this new technique involves leveraging `diskmgmt.msc` to unmount the volumes where critical security software components are installed. By detaching these volumes, the ransomware renders the EDR/EPP agents inoperable, as they can no longer access their necessary files and processes. This method is particularly insidious because it utilizes a trusted, signed Windows system process, making it harder for traditional behavioral detection rules to flag the activity as malicious. Following the neutralization of endpoint security, the attackers then move laterally to compromise network firewalls. They achieve this by exploiting vulnerabilities or using stolen administrative credentials to gain control, effectively severing the organization's ability to monitor or contain the internal breach and blocking potential external communication for incident response.
This dual-pronged approach—disabling endpoint security and seizing network perimeter controls—creates a "perfect storm" for the victim organization. With EDR/EPP silenced and firewalls under adversarial control, the attackers operate with near impunity to conduct reconnaissance, credential harvesting, and ultimately, the deployment of the Play ransomware to encrypt files across the network. The seizure of firewalls also allows the group to potentially establish persistent backdoors and disrupt any attempts at recovery or communication with outside help, significantly increasing the pressure to pay the ransom.
The Play group's tactics underscore a critical trend in the ransomware landscape: the shift from mere data encryption to comprehensive infrastructure takeover. Defenders can no longer rely solely on endpoint protection; a layered defense strategy is paramount. Halcyon recommends several mitigation steps, including implementing robust application allowlisting to block unauthorized processes like the misuse of `diskmgmt.msc`, enforcing strict multi-factor authentication (MFA) on all network devices—especially firewalls—and employing advanced threat hunting to detect the subtle signs of volume dismounting and lateral movement before the ransomware payload is triggered. Proactive monitoring of administrative tool usage and network device configurations is now essential for early detection and response.
