Yes, yet the ransomware is designed not to be identified by the firewall, so it can infiltrate the company’s internal system and disable defenses, move laterally, and alter backup routines.
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The user can identify the ransomware action, even if the system cannot identify it, the malware uses the system’s own resources for the encryption process, and may be slow to respond to user requests.
The file extensions are changed, a specific extension is added that mentions the attacker group. Stay tuned for these signs.