EVTX Created In Uncommon Location

 1title: EVTX Created In Uncommon Location
 2id: 65236ec7-ace0-4f0c-82fd-737b04fd4dcb
 3status: experimental
 4description: Detects the creation of new files with the ".evtx" extension in non-common locations. Which could indicate tampering with default evtx locations in order to evade security controls
 5references:
 6    - https://learn.microsoft.com/en-us/windows/win32/eventlog/eventlog-key
 7author: D3F7A5105
 8date: 2023/01/02
 9modified: 2023/07/13
10tags:
11    - attack.defense_evasion
12    - attack.t1562.002
13logsource:
14    category: file_event
15    product: windows
16    definition: 'Requirements: The ".evtx" extension should be monitored via a Sysmon configuration. Example: <TargetFilename condition="end with">.evtx<TargetFilename>'
17detection:
18    selection:
19        TargetFilename|endswith: '.evtx'
20    filter_main_path:
21        TargetFilename|contains: ':\Windows\System32\winevt\Logs\'
22    filter_main_baseimage:
23        TargetFilename|contains: ':\ProgramData\Microsoft\Windows\Containers\BaseImages\'
24        TargetFilename|endswith: '\Windows\System32\winevt\Logs\'
25    filter_main_generic_img:
26        Image|endswith:
27            - ':\Windows\explorer.exe'
28            - ':\Windows\system32\dllhost.exe'
29    condition: selection and not 1 of filter_main_*
30falsepositives:
31    - Administrator or backup activity
32level: high