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Recent windows versions rely on the ["MSV1_0" authentication package](https://docs.microsoft.com/en-us/windows/win32/secauthn/msv1-0-authentication-package). Production environment tests have shown that NTLM downgrade attacks can be performed as detected by this rule although some of the registry keys are located in an "Lsa" subkey ("MSV1_0"). This commit introduces additionnal wildcards to handle these cases to ensure the previous detection rules are still included.
42 lines
1.2 KiB
YAML
42 lines
1.2 KiB
YAML
action: global
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title: NetNTLM Downgrade Attack
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id: d67572a0-e2ec-45d6-b8db-c100d14b8ef2
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description: Detects post exploitation using NetNTLM downgrade attacks
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references:
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- https://www.optiv.com/blog/post-exploitation-using-netntlm-downgrade-attacks
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author: Florian Roth
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date: 2018/03/20
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tags:
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- attack.credential_access
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- attack.t1212
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detection:
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condition: 1 of them
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falsepositives:
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- Unknown
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level: critical
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---
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logsource:
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product: windows
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service: sysmon
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detection:
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selection1:
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EventID: 13
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TargetObject:
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- '*SYSTEM\\*ControlSet*\Control\Lsa\lmcompatibilitylevel'
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- '*SYSTEM\\*ControlSet*\Control\Lsa*\NtlmMinClientSec'
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- '*SYSTEM\\*ControlSet*\Control\Lsa*\RestrictSendingNTLMTraffic'
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---
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# Windows Security Eventlog: Process Creation with Full Command Line
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logsource:
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product: windows
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service: security
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definition: 'Requirements: Audit Policy : Object Access > Audit Registry (Success)'
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detection:
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selection2:
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EventID: 4657
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ObjectName: '\REGISTRY\MACHINE\SYSTEM\\*ControlSet*\Control\Lsa*'
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ObjectValueName:
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- 'LmCompatibilityLevel'
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- 'NtlmMinClientSec'
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- 'RestrictSendingNTLMTraffic'
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