Detectionhightest

Set Suspicious Files as System Files Using Attrib.EXE

Detects the usage of attrib with the "+s" option to set scripts or executables located in suspicious locations as system files to hide them from users and make them unable to be deleted with simple rights. The rule limits the search to specific extensions and directories to avoid FPs

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Nasreddine Bencherchali (Nextron Systems)Created Tue Jun 28Updated Tue Mar 14efec536f-72e8-4656-8960-5e85d091345bwindows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection_img:
        - Image|endswith: '\attrib.exe'
        - OriginalFileName: 'ATTRIB.EXE'
    selection_cli:
        CommandLine|contains: ' +s'
    selection_paths:
        CommandLine|contains:
            - ' %' # Custom Environment variable
            - '\Users\Public\'
            - '\AppData\Local\'
            - '\ProgramData\'
            - '\Downloads\'
            - '\Windows\Temp\'
    selection_ext:
        CommandLine|contains:
            - '.bat'
            - '.dll'
            - '.exe'
            - '.hta'
            - '.ps1'
            - '.vbe'
            - '.vbs'
    filter_optional_installer:
        CommandLine|contains|all:
            - '\Windows\TEMP\'
            - '.exe'
    condition: all of selection* and not 1 of filter_optional_*