Qualys Alert Details
Alert ID: QUALYS-EXPLOIT-1068-7842
Alert Time: 2024-02-17 11:30:45 EST
Severity: CRITICAL (95/100)
Source: Qualys Vulnerability Management + EDR Correlation
Rule: “CVE-2024-1234 Exploit Attempt Detected”
MITRE ATT&CK: T1068 – Exploitation for Privilege Escalation
Alert Details:
Vulnerability Context:
– CVE: CVE-2024-1234 (Windows Kernel Privilege Escalation)
– CVSS: 9.8 (Critical)
– Affected Systems: Windows 10 21H2, Windows Server 2019
– Patch Available: KB5034123 (released 2024-01-15)
Detection Details:
– Host: ENG-WS-056 (Engineering Workstation)
– User: rjohnson (Robert Johnson – Standard User)
– Time: 11:25 EST
– Source Process: exploit.exe (PID: 7842)
– Path: C:\Users\rjohnson\Downloads\exploit.exe
Exploit Behavior:
– exploit.exe loaded specific DLLs: ntoskrnl.exe, win32k.sys
– Attempted to allocate kernel memory
– Triggered race condition in kernel object manager
– Created SYSTEM shell (cmd.exe) at 11:26 EST
– SYSTEM shell connected to 185.143.221[.]89:443
Qualys Detection Logic:
– Host is vulnerable to CVE-2024-1234 (unpatched)
– Process exploit.exe matches known exploit hash
– Behavior pattern matches privilege escalation
– SYSTEM shell created from non-admin user
Additional Context:
– Patch KB5034123 not installed (missed by patch management)
– User downloaded exploit from GitHub “proof of concept” repository
– Exploit successfully escalated to SYSTEM
SOC Investigation Process
Step
Action
Tools Used
Findings
1. Alert Validation
Verify Qualys + EDR correlation
Qualys, CrowdStrike
Confirmed exploit execution and SYSTEM shell
2. Immediate Action
Terminate SYSTEM shell
CrowdStrike
SYSTEM shell (cmd.exe) killed
3. Network Block
Block C2 connection
Palo Alto Firewall
C2 IP blocked
4. Exploit Removal
Delete exploit.exe
CrowdStrike Live Response
Malicious file removed
5. Patch Application
Apply missing patch
SCCM, WSUS
KB5034123 deployed to all vulnerable hosts
6. Threat Hunting
Check for other exploit usage
CrowdStrike, Splunk
No other hosts showed same behavior
Jira Incident Report
Ticket: SOC-2024-088
Summary: T1068 – Kernel Exploit (CVE-2024-1234) Successfully Escalates to SYSTEM
Status: RESOLVED
Resolution: MALICIOUS – Exploit Contained
Priority: P1 – CRITICAL
Labels: T1068, privilege-escalation, kernel-exploit, cve-2024-1234, qualys
Components: Vulnerability-Management, Endpoint-Security
INCIDENT ANALYSIS REPORT
1. Initial Context:
Detection Source: Qualys Vulnerability Management + EDR correlation.
Alert: “CVE-2024-1234 Exploit Attempt Detected”.
Host: ENG-WS-056 (Engineering Department, user rjohnson).
Time: 2024-02-17 11:30 EST.
Technique: MITRE ATT&CK T1068 – Exploitation for Privilege Escalation.
2. Technical Analysis:
Attack Chain:
11:15 – User downloads exploit.exe from GitHub (PoC repository)
11:20 – User runs exploit.exe (thinking it’s a “security tool”)
11:21 – exploit.exe checks OS version, finds vulnerable (unpatched)
11:22 – Exploit triggers kernel race condition
11:23 – Kernel memory corruption successful
11:24 – SYSTEM shell (cmd.exe) spawned
11:25 – SYSTEM shell connects to C2 at 185.143.221[.]89:443
11:26 – Qualys + CrowdStrike alerts
Vulnerability Details:
CVE: 2024-1234 (Windows Kernel Privilege Escalation)
Component: win32k.sys (window manager)
Patch: KB5034123 (available 2024-01-15)
Root Cause: Missing patch (36 days unpatched)
Exploit Analysis:
File: exploit.exe (SHA256: b2c3d4e5f6…)
Source: Public GitHub repository (since removed)
Capabilities:
Checks OS version for vulnerability
Triggers race condition in kernel object manager
Spawns SYSTEM shell on success
Downloads additional payload from C2
Post-Exploitation:
SYSTEM shell connected to C2 at 11:25
Beacon sent system information
No additional commands before termination
3. Investigation Findings:
Timeline:
11:15 – Exploit downloaded
11:24 – SYSTEM shell created
11:25 – C2 connection
11:26 – Alerts trigger
11:27 – SOC investigates
11:28 – SYSTEM shell terminated
11:29 – C2 IP blocked
Indicators of Compromise (IoCs):
Files:
– exploit.exe (SHA256: b2c3d4e5f6…)
Network:
– C2: 185.143.221[.]89:443
Process:
– SYSTEM shell (cmd.exe)
4. Containment Actions:
Immediate Actions:
Terminated SYSTEM shell.
Deleted exploit.exe.
Blocked C2 IP at firewall.
Isolated host temporarily.
Patch Remediation:
Applied KB5034123 to affected host.
Scanned all systems for missing patch.
Deployed patch enterprise-wide via SCCM.
User Remediation:
User counseled on downloading exploits.
Escalated to manager.
Required security training.
5. Root Cause Analysis:
Primary Cause: Missing critical patch (KB5034123) for 36 days.
Contributing Factors:
Patch management failure (host missed monthly patch cycle).
User downloaded and executed public exploit.
No application control blocking unknown executables.
6. Business Impact:
Operational Impact: Engineering workstation offline for 2 hours.
Security Impact: SYSTEM access achieved for 2 minutes.
Data Exposure: System information sent to C2 (no sensitive data).
7. Remediation & Prevention:
Completed Actions:
SYSTEM shell terminated.
Exploit removed.
Patch applied.
C2 blocked.
Technical Controls Enhanced:
Ensured all systems receive critical patches within 7 days.
Implemented application control (CrowdStrike Falcon Prevent).
Enhanced vulnerability scanning frequency (daily for critical).
Created alert for any privilege escalation attempts.
8. Conclusion:
An unpatched engineering workstation allowed a user-executed exploit to successfully escalate to SYSTEM privileges. The exploit connected to C2 before detection. Rapid response terminated the shell and blocked the C2. The missing patch was applied enterprise-wide.
Closure Rationale: SYSTEM shell terminated; patch applied; exploit removed.
Analyst: [Walter White], SOC Analyst
Date: 2024-02-17 12:30 EST