Palo Alto Alert Details
Alert ID: PAN-EXFIL-C2-1041-7842 Alert Time: 2024-03-01 10:30:22 EST Severity: CRITICAL (95/100) Source: Palo Alto Networks Firewall + WildFire Rule: “Data Exfiltration Detected over Established C2 Channel” MITRE ATT&CK: T1041 – Exfiltration Over C2 Channel
Alert Details:
Detection: Large data transfer over previously established C2 connection
Source: 192.168.45.78 (ENG-WS-045 – Engineering) Destination: 185.143.221[.]89:443 Time: 10:15-10:30 EST
Connection History:
09:00: First C2 beacon (established)
09:00-10:15: Periodic beacons (every 5 minutes, <1KB each)
10:15-10:30: Large data transfer (47 MB in 15 minutes)
Traffic Analysis:
09:00:15 – POST /beacon (124 bytes) – C2 check-in
09:05:22 – POST /beacon (118 bytes) – C2 check-in
09:10:18 – POST /beacon (132 bytes) – C2 check-in
…
10:15:33 – POST /upload (12.3 MB) – data exfiltration
10:20:47 – POST /upload (11.8 MB) – data exfiltration
10:25:52 – POST /upload (12.1 MB) – data exfiltration
10:28:15 – POST /upload (10.8 MB) – data exfiltration
Data Analysis (WildFire sandbox):
Files exfiltrated: source code archives, design documents
Total: 47 MB in 4 uploads
Encrypted with C2 session key
Detection Logic:
Baseline C2 traffic: small beacons (<1KB)
Anomaly: 47 MB transfer in 15 minutes
Same destination IP as C2
Pattern matches exfiltration over existing C2 channel
SOC Investigation Process
Step
Action
Tools Used
Findings
1. Alert Validation
Verify Palo Alto alert
Panorama Logs
Confirmed exfiltration over C2 channel
2. Process Investigation
Identify process on endpoint
CrowdStrike Falcon
Cobalt Strike beacon exfiltrating data
3. Data Analysis
Determine what was stolen
File Audit Logs, EDR
47 MB of source code and designs exfiltrated
4. Immediate Action
Isolate host
CrowdStrike
ENG-WS-045 quarantined
5. C2 Blocking
Block destination IP
Palo Alto
185.143.221[.]89 blocked
6. Incident Response
Activate breach response
Legal, PR, Management
Data breach declared
Jira Incident Report
Ticket: SOC-2024-155 Summary: T1041 – 47 MB of Intellectual Property Exfiltrated Over C2 Channel Status: RESOLVED Resolution: MALICIOUS – Data Breach Confirmed Priority: P1 – CRITICAL Labels: T1041, exfiltration, c2-channel, cobalt-strike, palo-alto, data-breach Components: Network-Security, Data-Protection, Incident-Response
INCIDENT ANALYSIS REPORT
1. Initial Context:
Detection Source: Palo Alto Networks Firewall + WildFire.
Alert: “Data Exfiltration Detected over Established C2 Channel”.
Source: ENG-WS-045 (Engineering, user alexchen).
Destination: 185.143.221[.]89:443.
Data: 47 MB exfiltrated.
Time: 2024-03-01 10:30 EST.
Technique: MITRE ATT&CK T1041 – Exfiltration Over C2 Channel.
2. Technical Analysis:
Attack Chain:
08:30 – alexchen account compromised via phishing
08:45 – Attacker logs into ENG-WS-045 via RDP
08:50 – Cobalt Strike beacon deployed
09:00-10:15 – Beaconing (small traffic)
10:00 – Attacker collects sensitive files
10:15-10:30 – Data exfiltration
10:30 – Palo Alto detects
Exfiltrated Data (47 MB):
Source Code: ProjectX (12 MB) – proprietary algorithms
Design Documents: CAD files (15 MB) – product designs
Customer Data: CSV files (8 MB) – PII
Financial Reports: Q4 projections (5 MB)
VPN Configurations: (2 MB) – network access
Password Database: KeePass (5 MB) – all corporate passwords
Exfiltration Method:
C2 Channel: HTTPS POST to same C2 used for beacons
Encryption: Session key from C2 handshake
Chunking: Data split into 4 uploads (10-12 MB each)
Timing: 15 minutes total
Attacker Activity:
Collected data from multiple locations
Created archives before exfiltration
Used existing C2 channel to avoid new connections
3. Investigation Findings:
Timeline:
08:30 – Account compromised
08:45 – Attacker logs in
08:50 – Beacon deployed
09:00-10:15 – Beaconing
10:00-10:15 – Data collection
10:15-10:30 – Exfiltration
10:30 – Palo Alto alert
10:32 – SOC investigates
10:33 – Host isolated
10:34 – C2 blocked
Indicators of Compromise (IoCs):
Network:
– C2: 185.143.221[.]89:443
– Beacon pattern: small traffic then large uploads
Data:
– 47 MB exfiltrated (source code, designs, customer data, passwords)
Account:
– alexchen (compromised)
4. Containment Actions:
Immediate Actions:
Isolated ENG-WS-045 via CrowdStrike.
Blocked C2 IP at firewall.
Terminated beacon process.
Disabled alexchen account.
Reset password.
Breach Response:
Declared data breach.
Notified legal, PR, management.
Began customer notification process (for PII exposure).
Rotated all passwords (corporate-wide).
Host Remediation:
Reimaged host.
5. Root Cause Analysis:
Primary Cause: User account compromised, leading to data theft.
Contributing Factors:
No MFA on account.
RDP allowed from internet.
C2 channel established undetected for 2 hours before exfiltration.
6. Business Impact:
Operational Impact: Engineering host offline; password reset for all users.
Data Exposure: 47 MB of IP, PII, and credentials exfiltrated.
Regulatory Impact: GDPR/CCPA breach (customer PII).
Financial Impact: Significant (incident response, notification, potential fines).
7. Remediation & Prevention:
Completed Actions:
Exfiltration stopped.
Host isolated.
Account secured.
Breach response initiated.
Technical Controls Enhanced:
Enforced MFA for all users.
Moved RDP behind VPN only.
Implemented DLP for egress traffic.
Enhanced monitoring for traffic anomalies (beaconing + large transfers).
8. Conclusion:
An attacker compromised an engineering account and used an established C2 channel to exfiltrate 47 MB of intellectual property, customer data, and corporate passwords. Palo Alto detected the anomalous traffic pattern, but exfiltration had already occurred. A full data breach response was initiated.
Closure Rationale: Data exfiltrated; exfiltration stopped; breach response initiated; all passwords rotated.
Analyst: [Your Name], SOC Analyst Date: 2024-03-01 11:30 EST
End of Batch 23
Ready for your next batch of prompts whenever you are.
Batch 24: Exfiltration Incident Reports
Here are the next 5 detailed SOC incident reports.