{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/sslvpn/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Fortigate SSL VPN"],"_cs_severities":["medium"],"_cs_tags":["fortigate","sslvpn","initial-access","siem"],"_cs_type":"advisory","_cs_vendors":["Fortinet"],"content_html":"\u003cp\u003eThis brief focuses on detecting potential malicious activity following a successful Fortigate SSL VPN login. The alert is triggered when a user successfully logs in to the Fortigate SSL VPN and is subsequently flagged by a SIEM system, indicating suspicious or anomalous behavior after gaining network access. This could signify a compromised account being used for malicious purposes or an attacker leveraging VPN access for lateral movement and data exfiltration. Defenders should investigate these alerts promptly to identify and contain potential breaches. The detection is based on observing VPN logins in conjunction with other security alerts generated by the SIEM.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains credentials through phishing or credential stuffing (Hypothetical).\u003c/li\u003e\n\u003cli\u003eAttacker successfully authenticates to the Fortigate SSL VPN using the compromised credentials.\u003c/li\u003e\n\u003cli\u003eInitial access to the internal network is established via the VPN tunnel.\u003c/li\u003e\n\u003cli\u003eAttacker performs reconnaissance activities, such as network scanning and enumeration, potentially using tools like Nmap or Bloodhound.\u003c/li\u003e\n\u003cli\u003eMalicious activity triggers a SIEM alert (e.g., unusual file access, suspicious process creation, or lateral movement).\u003c/li\u003e\n\u003cli\u003eThe attacker attempts to escalate privileges on compromised systems using exploits or credential dumping tools like Mimikatz (Hypothetical).\u003c/li\u003e\n\u003cli\u003eAttacker moves laterally within the network to gain access to sensitive data or critical systems.\u003c/li\u003e\n\u003cli\u003eData exfiltration is initiated using tools like rclone or scp (Hypothetical), or ransomware is deployed.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful attack following a Fortigate SSL VPN login can lead to significant consequences, including data breaches, financial losses, and reputational damage. By compromising a VPN account, attackers can bypass network perimeter security and gain access to sensitive internal resources. The impact can range from unauthorized access to sensitive data to the complete disruption of business operations through ransomware deployment. Targeted sectors could include any organization relying on Fortigate SSL VPN for remote access.\u003c/p\u003e\n","date_modified":"2024-01-30T12:00:00Z","date_published":"2024-01-30T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-30-fortigate-ssl-vpn-siem-alert/","summary":"Detection of initial access via Fortigate SSL VPN login, followed by a SIEM alert, indicating potential malicious activity post-VPN access.","title":"Fortigate SSL VPN Login Followed by SIEM Alert","url":"https://feed.craftedsignal.io/briefs/2024-01-30-fortigate-ssl-vpn-siem-alert/"}],"language":"en","title":"CraftedSignal Threat Feed - Sslvpn","version":"https://jsonfeed.org/version/1.1"}