Detectionhightest
NetNTLM Downgrade Attack
Detects NetNTLM downgrade attack
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Launch
Florian Roth (Nextron Systems), waggaCreated Tue Mar 20Updated Sun Oct 09d3abac66-f11c-4ed0-8acb-50cc29c97eedwindows
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Definition
Requirements: Audit Policy : Object Access > Audit Registry (Success)
Detection Logic
Detection Logic1 selector
detection:
selection:
EventID: 4657
ObjectName|contains|all:
- '\REGISTRY\MACHINE\SYSTEM'
- 'ControlSet'
- '\Control\Lsa'
ObjectValueName:
- 'LmCompatibilityLevel'
- 'NtlmMinClientSec'
- 'RestrictSendingNTLMTraffic'
condition: selectionFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Techniques
Sub-techniques
Rule Metadata
Rule ID
d3abac66-f11c-4ed0-8acb-50cc29c97eed
Status
test
Level
high
Type
Detection
Created
Tue Mar 20
Modified
Sun Oct 09
Path
rules/windows/builtin/security/win_security_net_ntlm_downgrade.yml
Raw Tags
attack.persistenceattack.defense-evasionattack.t1562.001attack.t1112