Hayabusa high test sigma
Disable Windows Defender Functionalities Via Registry Keys
Detects when attackers or tools disable Windows Defender functionalities via the Windows registry
Detection Logic
{
"registry_set": {
"EventID": 4657,
"Channel": "Security"
},
"selection_main": {
"ObjectName
| contains": [
"\\SOFTWARE\\Microsoft\\Windows Defender\\",
"\\SOFTWARE\\Policies\\Microsoft\\Windows Defender Security Center\\",
"\\SOFTWARE\\Policies\\Microsoft\\Windows Defender\\"
]
},
"selection_dword_1": {
"ObjectName
| endswith": [
"\\DisableAntiSpyware",
"\\DisableAntiVirus",
"\\DisableBehaviorMonitoring",
"\\DisableBlockAtFirstSeen",
"\\DisableEnhancedNotifications",
"\\DisableIntrusionPreventionSystem",
"\\DisableIOAVProtection",
"\\DisableOnAccessProtection",
"\\DisableRealtimeMonitoring",
"\\DisableScanOnRealtimeEnable",
"\\DisableScriptScanning"
],
"NewValue": "DWORD (0x00000001)"
},
"selection_dword_0": {
"ObjectName
| endswith": [
"\\DisallowExploitProtectionOverride",
"\\Features\\TamperProtection",
"\\MpEngine\\MpEnablePus",
"\\PUAProtection",
"\\Signature Update\\ForceUpdateFromMU",
"\\SpyNet\\SpynetReporting",
"\\SpyNet\\SubmitSamplesConsent",
"\\Windows Defender Exploit Guard\\Controlled Folder Access\\EnableControlledFolderAccess"
],
"NewValue": "DWORD (0x00000000)"
},
"filter_optional_symantec": {
"ProcessName
| startswith": "C:\\Program Files\\Symantec\\Symantec Endpoint Protection\\",
"ProcessName
| endswith": "\\sepWscSvc64.exe"
},
"condition": "registry_set and (selection_main and 1 of selection_dword_* and not 1 of filter_optional_*)"
} False Positives
- ⚠ Administrator actions via the Windows Defender interface
- ⚠ Third party Antivirus
Field Validations
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