Detectionmediumtest
Access To Windows DPAPI Master Keys By Uncommon Applications
Detects file access requests to the the Windows Data Protection API Master keys by an uncommon application. This can be a sign of credential stealing. Example case would be usage of mimikatz "dpapi::masterkey" function
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Nasreddine Bencherchali (Nextron Systems)Created Mon Oct 17Updated Mon Jul 2946612ae6-86be-4802-bc07-39b59feb1309windows
Log Source
Windowsfile_access
ProductWindows← raw: windows
Categoryfile_access← raw: file_access
Definition
Requirements: Microsoft-Windows-Kernel-File ETW provider
Detection Logic
Detection Logic2 selectors
detection:
selection:
FileName|contains:
- '\Microsoft\Protect\S-1-5-18\' # For System32
- '\Microsoft\Protect\S-1-5-21-' # For Users
filter_system_folders:
Image|startswith:
- 'C:\Program Files\'
- 'C:\Program Files (x86)\'
- 'C:\Windows\system32\'
- 'C:\Windows\SysWOW64\'
condition: selection and not 1 of filter_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
46612ae6-86be-4802-bc07-39b59feb1309
Status
test
Level
medium
Type
Detection
Created
Mon Oct 17
Modified
Mon Jul 29
Path
rules/windows/file/file_access/file_access_win_susp_dpapi_master_key_access.yml
Raw Tags
attack.credential-accessattack.t1555.004