Malicious IP address list have reputations just like people do, and security companies keep lists of malicious or suspicious IPs that are associated with cyberattacks, such as brute force attacks and phishing schemes. Firewalls and antivirus software can then use these lists to block access from or to those IPs.
You can add reputation lists to your NetScaler appliance by importing them as an expression and referencing them in a policy just the same way you would reference a preconfigured rule. You can also use a cloud-based service to automatically add and update these lists.
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Malicious IP address list are grouped into categories such as malware distribution, phishing, scanning, and c&c servers, among others. Each category describes a specific type of attack or threat. For example, RATs describe devices that allow attackers to remotely control hijacked computers, while phishing IPs associate websites used by scammers to gather user credentials. Scamming IPs, meanwhile, belong to fraudsters who masquerade as tech support workers or other services personnel to trick victims into installing malicious software or providing sensitive information.
Many of these categories rely on community reporting to flag suspicious activity. For example, some security platforms and databases rely on users to report malicious IPs or domains that they encounter, and then use that information to determine if the IPs should be included in the list. To minimize the risk of your IP address being flagged, follow best practices in network security and ensure that you’re not using an open proxy or a misconfigured web server.
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