OFAC Sanctions 1VPNS: Infrastructure Strikes and the Malware Cryptor Connection

Just caught the OFAC announcement regarding the sanctions on 'First VPN Service' (1VPNS) and the 45-year-old Ukrainian national selling malware cryptors. This is a significant shift—targeting the enablers rather than just the payload droppers. The specific link to ransomware support via this VPN changes how we treat anonymous traffic in our logs.

For those scrubbing their networks, simply looking for 'VPN' traffic isn't enough. We need to block the specific infrastructure associated with 1VPNS. If you have the IP ranges from the advisory, you can automate the check against your current active sessions. Here is a quick Python script to validate if an IP falls within the sanctioned range (you'll need to fill in the actual CIDR from the release):

import ipaddress

sancti  # Replace with actual 1VPNS range
def check_ip(ip_str):
    try:
        return ipaddress.ip_address(ip_str) in ipaddress.ip_network(sanctioned_cidr)
    except ValueError:
        return False

The cryptor element is equally dangerous. These tools help ransomware bypass signature-based detection. We should be hunting for processes with sparse headers or unusual section names in our EDR telemetry.

Discussion: With the rise of 'dual-use' tools being sanctioned for malicious intent, how aggressive are you being with auto-blocks? Are you worried about false positives on legitimate privacy users, or is the risk of ransomware support enough to warrant zero-trust on these IPs?