Emerging Threatcriticaltest
CVE-2023-23397 Exploitation Attempt
Detects outlook initiating connection to a WebDAV or SMB share, which could be a sign of CVE-2023-23397 exploitation.
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Launch
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Definition
Requirements: SACLs must be enabled for "Query Value" on the registry keys used in this rule
Detection Logic
Detection Logic1 selector
detection:
selection:
EventID:
- 4656
- 4663
ProcessName|endswith: '\OUTLOOK.EXE'
# Example: \REGISTRY\MACHINE\SYSTEM\CurrentControlSet001\Services\WebClient\NetworkProvider
ObjectName|contains|all:
- '\REGISTRY\MACHINE\SYSTEM'
- 'Services\'
ObjectName|endswith:
- 'WebClient\NetworkProvider'
- 'LanmanWorkstation\NetworkProvider'
AccessList|contains: '%%4416' # "Query key value"
condition: selectionFalse Positives
Searchprotocolhost.exe likes to query these registry keys. To avoid false postives, it's better to filter out those events before they reach the SIEM
References
MITRE ATT&CK
Other
cve.2023-23397detection.emerging-threats
Rule Metadata
Rule ID
73c59189-6a6d-4b9f-a748-8f6f9bbed75c
Status
test
Level
critical
Type
Emerging Threat
Created
Thu Mar 16
Modified
Wed Mar 22
Author
Path
rules-emerging-threats/2023/Exploits/CVE-2023-23397/win_security_exploit_cve_2023_23397_outlook_remote_file_query.yml
Raw Tags
attack.credential-accessattack.initial-accesscve.2023-23397detection.emerging-threats