Detect Microsoft Windows Information Disclosure (CVE-2026-20805) in Sumo Logic CSE
Detects exploitation of CVE-2026-20805, a Microsoft Windows information disclosure vulnerability (CWE-200) that allows attackers to access sensitive memory or kernel data. This vulnerability is actively exploited in the wild (CISA KEV). Successful exploitation may expose credentials, memory contents, or system information that enables privilege escalation or lateral movement.
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=windows* OR _sourceCategory=sysmon*
| parse field=_raw "EventID=*" as event_id nodrop
| parse field=_raw "CommandLine=*" as command_line nodrop
| parse field=_raw "IntegrityLevel=*" as integrity_level nodrop
| parse field=_raw "ObjectName=*" as object_name nodrop
| parse field=_raw "User=*" as user_name nodrop
| parse field=_raw "Computer=*" as computer_name nodrop
| where (event_id in ("4663", "4656") and (
object_name matches "*lsass*" or
object_name matches "*\\SAM" or
object_name matches "*\\SECURITY" or
object_name matches "*ntds.dit*"
))
OR (
command_line matches "*NtQuerySystemInformation*" or
command_line matches "*ZwQuerySystemInformation*" or
command_line matches "*ReadProcessMemory*"
)
| where integrity_level in ("Low", "Medium") or integrity_level = ""
| timeslice 1h
| count as event_count by _timeslice, computer_name, user_name, event_id, command_line, object_name, integrity_level
| where event_count >= 1
| sort by event_count desc
| fields _timeslice, computer_name, user_name, event_id, command_line, object_name, integrity_level, event_countSumo Logic query detecting CVE-2026-20805 exploitation by parsing Windows Security and Sysmon logs for low-integrity processes performing sensitive object access or invoking kernel information disclosure APIs.
Data Sources
Required Tables
False Positives & Tuning
- Endpoint security software performing kernel-level process enumeration for threat detection
- Authorized red team or penetration testing activities targeting Windows systems
- System monitoring agents that regularly query OS-level metrics at low integrity
- Development and debugging tools such as WinDbg or Visual Studio performing process introspection
Other platforms for CVE-2026-20805
Testing Methodology
Validate this detection against 3 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 1NtQuerySystemInformation via PowerShell P/Invoke
Expected signal: Sysmon Event ID 1 (Process Create) for powershell.exe; Windows Event ID 4688 if process command line auditing is enabled; EDR process telemetry capturing the PowerShell invocation with P/Invoke patterns.
- Test 2LSASS Handle Open with VM_READ Access
Expected signal: Sysmon Event ID 10 (ProcessAccess) with TargetImage=lsass.exe, GrantedAccess=0x0010 (PROCESS_VM_READ), SourceImage=powershell.exe; Windows Security Event ID 4656 for handle request to LSASS process object.
- Test 3Sensitive Registry Hive Access from Low Integrity Context
Expected signal: Windows Security Event ID 4663 with ObjectName containing SECURITY hive path; Sysmon Event ID 1 for process creation with low integrity level token; Event ID 4656 for registry key open with sensitive access mask.
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