Background:<\/strong><\/p>\n\n\n\nIn an attack and defense drill of a customer, the attacker side did the following actions:<\/p>\n\n\n\n
1. The attacker side obtained the mailbox domain name in an organization through social engineering;<\/p>\n\n\n\n
2. The attacker side created a phishing email to lure the recipient to click and modify the email password, and changed the FROM field in the header of the email to forge the sender address of the email into the intranet mailbox of the organization, so that the recipient would trust the email source; 3. The attacker sends a pre-made phishing email to a recipient in the organization.<\/p>\n\n\n\n
Fast Analysis and Response<\/strong><\/p>\n\n\n\nThe UEBA engine of NSFOCUS ISOP detected that the above email activity deviated from the normal email behavior model learned in history, and generated an alert of “Phishing Activity: FROM Header Forgery” quickly. The defender side checked this alert on the ISOP platform and found that the suffix of the email sender was inconsistent with the suffix of the forged sender’s address as shown in the event details payload, and the email subject and body induced the recipient to change the mailbox password. These details proved it was a fraudulent phishing email.<\/p>\n\n\n\n
The defender quickly responded to the incident and reminded the recipient not to click on this phishing email, so as to prevent further spread of attacks and effectively prevent subsequent harm of this phishing email.<\/p>\n\n\n\n
Case 2:<\/strong><\/h3>\n\n\n\nBackground:<\/strong><\/p>\n\n\n\nAn internal account of a customer was stolen. The thief used this controlled account to access sensitive system data and transmit data.<\/p>\n\n\n\n
Quick Alert, Block, and Retrospection<\/strong><\/p>\n\n\n\nThe UEBA engine of NSFOCUS ISOP detected abnormal behaviors exceeding 5 times the historical baseline and generated an alert for the critical event. The security analysts of the customer quickly stopped the loss through the one-click block, and then took deep analysis of this incident by retrospection of the attack path.<\/p>\n\n\n\n
Case 3<\/strong>:<\/h3>\n\n\n\nBackground:<\/strong><\/p>\n\n\n\nIn an attack and defense drill of a customer, a non-target system was exploited through a risky service port by the attacker side. With that, the attacker side obtained a large number of users’ passwords, which were applied to other internal systems and further obtained a large amount of sensitive information.<\/p>\n\n\n\n
Accurate Behavior Analytics<\/strong><\/p>\n\n\n\nUEBA of NSFOCUS ISOP immediately generated alerts and notified the defender side automatically when it detected the abnormal behavior of a user accessing a rarely used service port many times.<\/p>\n\n\n\n
Conclusion<\/strong><\/h2>\n\n\n\nThe UEBA engine of NSFOCUS ISOP uses behavior baseline analysis to monitor and analyze network behaviors in real time. By comparing with the pre-set and self-learning baseline, the system can identify abnormal behaviors that do not conform to expected behaviors, including known and unknown attack behaviors. The UEBA engine protects organizations from abnormal behaviors, helps them discover security weaknesses, and improves overall security.<\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"
In offensive and defensive exercises, attackers will use various attack methods to maximize their objectives, including not only common attack methods but also complex attacks. Phishing email is popular among attackers as the most commonly used and low-cost attack method. Attackers typically use a variety of techniques and deception to send emails with malicious attachments […]<\/p>\n","protected":false},"author":1,"featured_media":25819,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3],"tags":[557],"class_list":["post-25814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-nsfocus-isop"],"acf":[],"yoast_head":"\n
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