IPSs are an useful piece of the defense-in-depth strategy, complementing new network instrument devices such as firewalls. IPS systems typically originate with many pre-built IPS signatures or rules for matching the acknowledged threats.
IPS may create thousands of alerts every day. The numerate of the generated alerts depends on numerous factors much as the assets of reciprocation throughput the IPS is evaluating, where the IPS is set within the network configuration, whether the IPS is adjusted to be applicable to the surroundings the IPS is postured to protect.
Instrument analysts poorness to be healthy to filtrate out false alerts, then see and correlate the harmonious IPS alerts to key potentially vixenish events, judgment any uncouth denominators between the alerts, and aggregation new supportive forensic accumulation from the fabric and endpoints.
The IPS alerts are only endeavor of the whole illustration. Warrantee analysts also demand to correlate IPS alerts with remaining aggregation, such as the firewall logs, DNS logs, web department logs, netmail logs, AAA computer logs, applications logs, NetFlow records, and PCAPs interchange analysis.
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In this sequence of IPS alerts, the first IPS alert indicates a terse alphanumeric executable downloader, which means an HTTP Get request contains .exe as part of the URI. The second IPS alert then indicates that an executable was downloaded from a host using its IP address, rather than its domain name. Usually, Internet users will use the domain name instead of the IP address to connect to a website.
For example, the below HTTP request triggered the above two IPS alerts:
In this example, this HTTP activity was also logged in the firewall log:
Aug 10 2016|15:59:59|304001|10.10.6.231 Accessed URL 220.127.116.11:http://18.104.22.168/system/logs/k1.exe
After researching the k1.exe file from threat research websites, that file was found to be associated with the Vawtrak malware.
The last IPS alert is a Talos IPS alert, which indicates that outbound CnC traffic has been detected.
In this example, the 10.10.6.231 host was the victim, which was exploited, and then downloaded the Vawtrak malware, which then triggered the CnC outbound traffic to the 22.214.171.124 attacker.
After the CnC has been established, additional IPS alerts may be triggered as the attacker begins the pivoting, and data exfiltration phase of the attack.