Detect MS08-067 NetAPI Buffer Overflow Exploitation Attempt (CVE-2008-4250) in Google Chronicle
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
YARA-L Detection Query
rule ms08_067_netapi_exploitation {
meta:
author = "df00tech Detection Engineering"
description = "Detects MS08-067 (CVE-2008-4250) NetAPI buffer overflow exploitation patterns"
severity = "CRITICAL"
priority = "HIGH"
reference = "https://learn.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-067"
cve = "CVE-2008-4250"
mitre_attack_id = "T1210"
events:
(
$network_event.metadata.event_type = "NETWORK_CONNECTION"
and $network_event.target.port in (445, 139, 135)
and not $network_event.principal.ip = "127.0.0.1"
and $network_event.metadata.vendor_name = "Microsoft"
) and (
$proc_event.metadata.event_type = "PROCESS_LAUNCH"
and $proc_event.principal.process.file.full_path = /svchost\.exe$/
and $proc_event.target.process.file.full_path = /(cmd|powershell|wscript|cscript|rundll32)\.exe$/
)
and $network_event.target.hostname = $proc_event.principal.hostname
and $network_event.metadata.event_timestamp.seconds <
$proc_event.metadata.event_timestamp.seconds
and ($proc_event.metadata.event_timestamp.seconds -
$network_event.metadata.event_timestamp.seconds) <= 120
condition:
$network_event and $proc_event
}Chronicle YARA-L rule correlating inbound SMB/RPC network connections with subsequent suspicious process launches from svchost.exe within a 2-minute window, characteristic of MS08-067 exploitation leading to code execution.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate remote management tools connecting over SMB and executing maintenance scripts
- Antivirus or EDR agents spawning child processes from svchost during updates
- Automated backup solutions using SMB file transfers followed by service operations
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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