Detect MS08-067 NetAPI Buffer Overflow Exploitation Attempt (CVE-2008-4250) in Splunk
CVE-2008-4250 is a critical buffer overflow vulnerability in the Windows Server service (netapi32.dll) affecting Microsoft Windows XP, 2000, 2003, Vista, and Server 2008. Exploitation via a specially crafted RPC request to the NetpwPathCanonicalize function allows unauthenticated remote code execution as SYSTEM. This vulnerability was exploited by the Conficker worm and remains listed in CISA's Known Exploited Vulnerabilities catalog. Detection focuses on suspicious SMB/RPC activity, NetAPI service anomalies, and post-exploitation indicators including lateral movement and payload staging.
MITRE ATT&CK
SPL Detection Query
index=windows (sourcetype=WinEventLog:Security OR sourcetype=WinEventLog:System OR sourcetype=XmlWinEventLog:Microsoft-Windows-Sysmon/Operational)
| eval detection_source=sourcetype
| eval event_time=_time
| where (EventCode=4624 OR EventCode=4625 OR EventCode=4688 OR EventCode=7045 OR EventCode=1)
| eval is_smb_auth=if(EventCode IN (4624,4625) AND Logon_Type="3", 1, 0)
| eval is_proc_create=if(EventCode=4688 OR EventCode=1, 1, 0)
| eval is_service_install=if(EventCode=7045, 1, 0)
| eval suspicious_parent=if(is_proc_create=1 AND (ParentProcessName LIKE "%svchost%" OR ParentImage LIKE "%svchost%") AND (NewProcessName LIKE "%cmd.exe" OR NewProcessName LIKE "%powershell.exe" OR Process_Name LIKE "%cmd.exe" OR CommandLine LIKE "%cmd%"), 1, 0)
| stats count AS total_events,
sum(is_smb_auth) AS smb_auth_events,
sum(is_proc_create) AS proc_create_events,
sum(is_service_install) AS service_installs,
sum(suspicious_parent) AS suspicious_parent_procs,
dc(IpAddress) AS distinct_src_ips,
values(IpAddress) AS src_ips,
values(NewProcessName) AS new_processes
BY host, span=5m
| where suspicious_parent_procs > 0 OR service_installs > 2 OR (smb_auth_events > 50 AND distinct_src_ips > 5)
| eval risk_score=case(
suspicious_parent_procs > 0 AND service_installs > 0, 95,
suspicious_parent_procs > 0, 80,
service_installs > 2, 70,
smb_auth_events > 50, 60,
true(), 50)
| eval detection_reason=case(
suspicious_parent_procs > 0, "Suspicious process spawned from svchost - possible MS08-067 RCE",
service_installs > 2, "Multiple service installs - possible Conficker/worm persistence",
smb_auth_events > 50, "High-volume SMB auth events - possible exploitation scan",
true(), "Anomalous Windows event pattern")
| table _time, host, detection_reason, risk_score, smb_auth_events, suspicious_parent_procs, service_installs, src_ips, new_processesDetects MS08-067 exploitation indicators across Windows event logs including suspicious svchost child processes, abnormal service installations consistent with Conficker persistence, and high-volume SMB authentication events.
Data Sources
Required Sourcetypes
False Positives & Tuning
- Automated patch deployment systems generating multiple service installations in short windows
- Domain controllers processing high volumes of network logon events during business hours
- Legitimate sysadmin scripts launching cmd.exe via scripted service contexts
Other platforms for CVE-2008-4250
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1MS08-067 Exploitation via Metasploit (Isolated Lab)
Expected signal: Inbound TCP connection to port 445 on target from attacker IP; svchost.exe spawning cmd.exe or a shell process; network connection back to attacker on port 4444; Windows Security Event 4624 (logon type 3) from attacker IP
- Test 2Conficker-Style SMB Scanning Simulation
Expected signal: High-volume TCP SYN packets to ports 445, 139, and 135 across multiple destination IPs; network flow logs showing >30 connections from single source within 5 minutes; IDS/firewall alerts for port scan activity
- Test 3Post-Exploitation Service Installation (Conficker Persistence Simulation)
Expected signal: Windows System Event ID 7045 (new service installed); Windows Security Event ID 4697 (service installed); Sysmon Event ID 12/13 registry modifications under HKLM\SYSTEM\CurrentControlSet\Services
- Test 4Lateral Movement via PsExec over SMB (Post-Exploitation Simulation)
Expected signal: TCP connection to port 445 on target; Windows Security Event 4624 (logon type 3) on target; PSEXESVC service installation Event ID 7045 on target; cmd.exe execution on target host under SYSTEM or Administrator context
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