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9e30985
new: Suspicious Credential Guard Registry Keys Deletion
swachchhanda000 55a35b9
chore: add regression tests
swachchhanda000 a7ec8d5
new: credential guard disable new rules
swachchhanda000 6626dc8
chore: add regression test
swachchhanda000 2210df9
fix: adjust logic
swachchhanda000 1e54553
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Binary file added
BIN
+68 KB
...ion/proc_creation_win_credential_guard_disabled/c17d47b7-dcd6-4109-87eb-d1817bd4cbc9.evtx
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66 changes: 66 additions & 0 deletions
66
...ion/proc_creation_win_credential_guard_disabled/c17d47b7-dcd6-4109-87eb-d1817bd4cbc9.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| { | ||
| "Event": { | ||
| "#attributes": { | ||
| "xmlns": "http://schemas.microsoft.com/win/2004/08/events/event" | ||
| }, | ||
| "System": { | ||
| "Provider": { | ||
| "#attributes": { | ||
| "Name": "Microsoft-Windows-Sysmon", | ||
| "Guid": "5770385F-C22A-43E0-BF4C-06F5698FFBD9" | ||
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| }, | ||
| "EventID": 1, | ||
| "Version": 5, | ||
| "Level": 4, | ||
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| "Opcode": 0, | ||
| "Keywords": "0x8000000000000000", | ||
| "TimeCreated": { | ||
| "#attributes": { | ||
| "SystemTime": "2025-12-26T06:45:49.034405Z" | ||
| } | ||
| }, | ||
| "EventRecordID": 23573, | ||
| "Correlation": null, | ||
| "Execution": { | ||
| "#attributes": { | ||
| "ProcessID": 3484, | ||
| "ThreadID": 3424 | ||
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| }, | ||
| "Channel": "Microsoft-Windows-Sysmon/Operational", | ||
| "Computer": "swachchhanda", | ||
| "Security": { | ||
| "#attributes": { | ||
| "UserID": "S-1-5-18" | ||
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| }, | ||
| "EventData": { | ||
| "RuleName": "-", | ||
| "UtcTime": "2025-12-26 06:45:49.010", | ||
| "ProcessGuid": "0197231E-2F1D-694E-F304-000000000A00", | ||
| "ProcessId": 12232, | ||
| "Image": "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe", | ||
| "FileVersion": "10.0.26100.1 (WinBuild.160101.0800)", | ||
| "Description": "Windows PowerShell", | ||
| "Product": "Microsoft® Windows® Operating System", | ||
| "Company": "Microsoft Corporation", | ||
| "OriginalFileName": "PowerShell.EXE", | ||
| "CommandLine": "\"C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\powershell.exe\" -c \"Set-ItemProperty -Path \"HKLM:Software\\Policies\\Microsoft\\Windows\\DeviceGuard\" -Name \"EnableVirtualizationBasedSecurity\" -Value 0\"", | ||
| "CurrentDirectory": "C:\\Windows\\System32\\", | ||
| "User": "swachchhanda\\xodih", | ||
| "LogonGuid": "0197231E-DDAE-694E-10B6-120000000000", | ||
| "LogonId": "0x12b610", | ||
| "TerminalSessionId": 1, | ||
| "IntegrityLevel": "High", | ||
| "Hashes": "MD5=1736263E02468939F808C0528E8DBB7E,SHA256=1F9FFC2227F8DEA8B771D543C464CF8166C22A39420A5322B5892A640C4B34B6,IMPHASH=68A9FF9C8D0D4655E46E1A7A190A41D2", | ||
| "ParentProcessGuid": "00000000-0000-0000-0000-000000000000", | ||
| "ParentProcessId": 10996, | ||
| "ParentImage": "-", | ||
| "ParentCommandLine": "-", | ||
| "ParentUser": "-" | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
..._data/rules/windows/process_creation/proc_creation_win_credential_guard_disabled/info.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| id: f96a3ce2-ae73-4171-8877-71ccf1da7ce5 | ||
| description: N/A | ||
| date: 2025-12-26 | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| rule_metadata: | ||
| - id: c17d47b7-dcd6-4109-87eb-d1817bd4cbc9 | ||
| title: Credential Guard Disabled | ||
| regression_tests_info: | ||
| - name: Positive Detection Test | ||
| type: evtx | ||
| provider: Microsoft-Windows-Sysmon | ||
| match_count: 1 | ||
| path: regression_data/rules/windows/process_creation/proc_creation_win_credential_guard_disabled/c17d47b7-dcd6-4109-87eb-d1817bd4cbc9.evtx |
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...tion_win_susp_credential_guard_registry_deleted/c629cc9b-8ddf-4282-9f10-6934ce3ea1ee.evtx
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66 changes: 66 additions & 0 deletions
66
...tion_win_susp_credential_guard_registry_deleted/c629cc9b-8ddf-4282-9f10-6934ce3ea1ee.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| { | ||
| "Event": { | ||
| "#attributes": { | ||
| "xmlns": "http://schemas.microsoft.com/win/2004/08/events/event" | ||
| }, | ||
| "System": { | ||
| "Provider": { | ||
| "#attributes": { | ||
| "Name": "Microsoft-Windows-Sysmon", | ||
| "Guid": "5770385F-C22A-43E0-BF4C-06F5698FFBD9" | ||
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| "EventID": 1, | ||
| "Version": 5, | ||
| "Level": 4, | ||
| "Task": 1, | ||
| "Opcode": 0, | ||
| "Keywords": "0x8000000000000000", | ||
| "TimeCreated": { | ||
| "#attributes": { | ||
| "SystemTime": "2025-12-26T19:24:05.907054Z" | ||
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| "EventRecordID": 18297, | ||
| "Correlation": null, | ||
| "Execution": { | ||
| "#attributes": { | ||
| "ProcessID": 3484, | ||
| "ThreadID": 3424 | ||
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| }, | ||
| "Channel": "Microsoft-Windows-Sysmon/Operational", | ||
| "Computer": "swachchhanda", | ||
| "Security": { | ||
| "#attributes": { | ||
| "UserID": "S-1-5-18" | ||
| } | ||
| } | ||
| }, | ||
| "EventData": { | ||
| "RuleName": "-", | ||
| "UtcTime": "2025-12-26 19:24:05.893", | ||
| "ProcessGuid": "0197231E-E0D5-694E-3803-000000000A00", | ||
| "ProcessId": 11088, | ||
| "Image": "C:\\Windows\\System32\\reg.exe", | ||
| "FileVersion": "10.0.26100.1 (WinBuild.160101.0800)", | ||
| "Description": "Registry Console Tool", | ||
| "Product": "Microsoft® Windows® Operating System", | ||
| "Company": "Microsoft Corporation", | ||
| "OriginalFileName": "reg.exe", | ||
| "CommandLine": "\"C:\\WINDOWS\\system32\\reg.exe\" DELETE HKLM\\Software\\Policies\\Microsoft\\Windows\\DeviceGuard /V RequirePlatformSecurityFeatures /F", | ||
| "CurrentDirectory": "C:\\Windows\\System32\\", | ||
| "User": "swachchhanda\\xodih", | ||
| "LogonGuid": "0197231E-DDAE-694E-10B6-120000000000", | ||
| "LogonId": "0x12b610", | ||
| "TerminalSessionId": 1, | ||
| "IntegrityLevel": "High", | ||
| "Hashes": "MD5=573EB13AC2BA31E9C2E17FB6DAD14154,SHA256=E295E776FD4F7F73DFAAA5698A19EA7A2F4A2F0C5E1681FAC94E45D00296C926,IMPHASH=A26BCB048DF34CBB422F2656F38634D0", | ||
| "ParentProcessGuid": "0197231E-DEC6-694E-8902-000000000A00", | ||
| "ParentProcessId": 10996, | ||
| "ParentImage": "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe", | ||
| "ParentCommandLine": "powershell", | ||
| "ParentUser": "swachchhanda\\xodih" | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
...indows/process_creation/proc_creation_win_susp_credential_guard_registry_deleted/info.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| id: 021bceb9-1c20-46af-a6ea-39c2a9583ff8 | ||
| description: N/A | ||
| date: 2025-12-26 | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| rule_metadata: | ||
| - id: c629cc9b-8ddf-4282-9f10-6934ce3ea1ee | ||
| title: Suspicious Credential Guard Registry Keys Deletion | ||
| regression_tests_info: | ||
| - name: Positive Detection Test | ||
| type: evtx | ||
| provider: Microsoft-Windows-Sysmon | ||
| match_count: 1 | ||
| path: regression_data/rules/windows/process_creation/proc_creation_win_susp_credential_guard_registry_deleted/c629cc9b-8ddf-4282-9f10-6934ce3ea1ee.evtx |
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...delete/registry_delete_disable_credential_guard/d645ef86-2396-48a1-a2b6-b629ca3f57ff.evtx
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...delete/registry_delete_disable_credential_guard/d645ef86-2396-48a1-a2b6-b629ca3f57ff.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| { | ||
| "Event": { | ||
| "#attributes": { | ||
| "xmlns": "http://schemas.microsoft.com/win/2004/08/events/event" | ||
| }, | ||
| "System": { | ||
| "Provider": { | ||
| "#attributes": { | ||
| "Name": "Microsoft-Windows-Sysmon", | ||
| "Guid": "5770385F-C22A-43E0-BF4C-06F5698FFBD9" | ||
| } | ||
| }, | ||
| "EventID": 12, | ||
| "Version": 2, | ||
| "Level": 4, | ||
| "Task": 12, | ||
| "Opcode": 0, | ||
| "Keywords": "0x8000000000000000", | ||
| "TimeCreated": { | ||
| "#attributes": { | ||
| "SystemTime": "2025-12-26T19:24:05.918776Z" | ||
| } | ||
| }, | ||
| "EventRecordID": 18298, | ||
| "Correlation": null, | ||
| "Execution": { | ||
| "#attributes": { | ||
| "ProcessID": 3484, | ||
| "ThreadID": 3424 | ||
| } | ||
| }, | ||
| "Channel": "Microsoft-Windows-Sysmon/Operational", | ||
| "Computer": "swachchhanda", | ||
| "Security": { | ||
| "#attributes": { | ||
| "UserID": "S-1-5-18" | ||
| } | ||
| } | ||
| }, | ||
| "EventData": { | ||
| "RuleName": "-", | ||
| "EventType": "DeleteValue", | ||
| "UtcTime": "2025-12-26 19:24:05.918", | ||
| "ProcessGuid": "0197231E-E0D5-694E-3803-000000000A00", | ||
| "ProcessId": 11088, | ||
| "Image": "C:\\WINDOWS\\system32\\reg.exe", | ||
| "TargetObject": "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\DeviceGuard\\RequirePlatformSecurityFeatures", | ||
| "User": "swachchhanda\\xodih" | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
.../rules/windows/registry/registry_delete/registry_delete_disable_credential_guard/info.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| id: 2e3725ae-2eaa-48a2-9d9b-4a7d55a75974 | ||
| description: N/A | ||
| date: 2025-12-26 | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| rule_metadata: | ||
| - id: d645ef86-2396-48a1-a2b6-b629ca3f57ff | ||
| title: Credential Guard Disabled Via Registry Deletion | ||
| regression_tests_info: | ||
| - name: Positive Detection Test | ||
| type: evtx | ||
| provider: Microsoft-Windows-Sysmon | ||
| match_count: 1 | ||
| path: regression_data/rules/windows/registry/registry_delete/registry_delete_disable_credential_guard/d645ef86-2396-48a1-a2b6-b629ca3f57ff.evtx |
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...stry_set/registry_set_credential_guard_disabled/73921b9c-cafd-4446-b0c6-fdb0ace42bc0.evtx
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...stry_set/registry_set_credential_guard_disabled/73921b9c-cafd-4446-b0c6-fdb0ace42bc0.json
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| { | ||
| "Event": { | ||
| "#attributes": { | ||
| "xmlns": "http://schemas.microsoft.com/win/2004/08/events/event" | ||
| }, | ||
| "System": { | ||
| "Provider": { | ||
| "#attributes": { | ||
| "Name": "Microsoft-Windows-Sysmon", | ||
| "Guid": "5770385F-C22A-43E0-BF4C-06F5698FFBD9" | ||
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| "Keywords": "0x8000000000000000", | ||
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| "#attributes": { | ||
| "SystemTime": "2025-12-26T06:45:50.191274Z" | ||
| } | ||
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| "Correlation": null, | ||
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| "ThreadID": 3424 | ||
| } | ||
| }, | ||
| "Channel": "Microsoft-Windows-Sysmon/Operational", | ||
| "Computer": "swachchhanda", | ||
| "Security": { | ||
| "#attributes": { | ||
| "UserID": "S-1-5-18" | ||
| } | ||
| } | ||
| }, | ||
| "EventData": { | ||
| "RuleName": "-", | ||
| "EventType": "SetValue", | ||
| "UtcTime": "2025-12-26 06:45:50.187", | ||
| "ProcessGuid": "0197231E-2F1D-694E-F304-000000000A00", | ||
| "ProcessId": 12232, | ||
| "Image": "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\powershell.exe", | ||
| "TargetObject": "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\DeviceGuard\\EnableVirtualizationBasedSecurity", | ||
| "Details": "DWORD (0x00000000)", | ||
| "User": "swachchhanda\\xodih" | ||
| } | ||
| } | ||
| } |
13 changes: 13 additions & 0 deletions
13
..._data/rules/windows/registry/registry_set/registry_set_credential_guard_disabled/info.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| id: 7d8d93c3-25b2-4225-9f91-66997f5b446f | ||
| description: N/A | ||
| date: 2025-12-26 | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| rule_metadata: | ||
| - id: 73921b9c-cafd-4446-b0c6-fdb0ace42bc0 | ||
| title: Credential Guard Disabled - Registry | ||
| regression_tests_info: | ||
| - name: Positive Detection Test | ||
| type: evtx | ||
| provider: Microsoft-Windows-Sysmon | ||
| match_count: 1 | ||
| path: regression_data/rules/windows/registry/registry_set/registry_set_credential_guard_disabled/73921b9c-cafd-4446-b0c6-fdb0ace42bc0.evtx |
60 changes: 60 additions & 0 deletions
60
rules/windows/process_creation/proc_creation_win_credential_guard_disabled.yml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| title: Credential Guard Disabled | ||
| id: c17d47b7-dcd6-4109-87eb-d1817bd4cbc9 | ||
| related: | ||
| - id: 73921b9c-cafd-4446-b0c6-fdb0ace42bc0 | ||
| type: similar | ||
| status: experimental | ||
| description: | | ||
| Detects attempts to disable Windows Credential Guard by modifying registry keys to set their values to 0. | ||
| Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them. | ||
| Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation. | ||
| references: | ||
| - https://woshub.com/disable-credential-guard-windows/ | ||
| - https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-deviceguard | ||
| author: Swachchhanda Shrawan Poudel (Nextron Systems) | ||
| date: 2025-12-26 | ||
| tags: | ||
| - attack.defense-evasion | ||
| - attack.t1562.001 | ||
| logsource: | ||
| category: process_creation | ||
| product: windows | ||
| detection: | ||
| selection_img: | ||
| - Image|endswith: | ||
| - '\powershell.exe' | ||
| - '\pwsh.exe' | ||
| - '\reg.exe' | ||
| - OriginalFileName: | ||
| - 'PowerShell.EXE' | ||
| - 'pwsh.dll' | ||
| - 'reg.exe' | ||
| selection_cli: | ||
| CommandLine|contains: | ||
| - 'add ' | ||
| - 'New-ItemProperty ' | ||
| - 'Set-ItemProperty ' | ||
| - 'si ' # SetItem Alias | ||
| selection_key_base: | ||
| CommandLine|contains: | ||
| - 'CurrentControlSet\Control\DeviceGuard' | ||
| - 'CurrentControlSet\Control\LSA' | ||
| - 'Software\Policies\Microsoft\Windows\DeviceGuard' | ||
| selection_key_specific: | ||
| CommandLine|contains: | ||
| - 'EnableVirtualizationBasedSecurity' | ||
| - 'RequirePlatformSecurityFeatures' | ||
| - 'LsaCfgFlags' | ||
| selection_value: | ||
| - CommandLine|endswith: ' 0' | ||
| - CommandLine|contains: | ||
| - ' 0 ' | ||
| - ' 0x0 ' | ||
| - '0x0"' | ||
| - '0"' | ||
| - '0x00000000' | ||
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|
||
| condition: all of selection_* | ||
| falsepositives: | ||
| - Legitimate administrative actions for troubleshooting, compatibility, or software installation purposes | ||
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|
||
| level: medium | ||
| regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_credential_guard_disabled/info.yml | ||
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