Detectionhightest

Office Macro File Creation From Suspicious Process

Detects the creation of a office macro file from a a suspicious process

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Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

François Hubaut, Nasreddine Bencherchali (Nextron Systems)Created Sun Jan 23Updated Wed Feb 22b1c50487-1967-4315-a026-6491686d860ewindows

Log Source

WindowsFile Event

ProductWindows← raw: windows

CategoryFile Event← raw: file_event

Events for file system activity including creation, modification, and deletion.

Definition

Requirements: The "ParentImage" field is not available by default on EID 11 of Sysmon logs. To be able to use this rule to the full extent you need to enriche the log with additional ParentImage data

Detection Logic

detection:
    selection_cmd:
        - Image|endswith:
              - '\cscript.exe'
              - '\mshta.exe'
              - '\regsvr32.exe'
              - '\rundll32.exe'
              - '\wscript.exe'
        # Note: ParentImage is a custom field and is not available by default on Sysmon EID 11
        - ParentImage|endswith:
              - '\cscript.exe'
              - '\mshta.exe'
              - '\regsvr32.exe'
              - '\rundll32.exe'
              - '\wscript.exe'
    selection_ext:
        TargetFilename|endswith:
            - '.docm'
            - '.dotm'
            - '.xlsm'
            - '.xltm'
            - '.potm'
            - '.pptm'
    condition: all of selection_*