Detectionhightest

Potential Data Exfiltration Activity Via CommandLine Tools

Detects the use of various CLI utilities exfiltrating data via web requests

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Nasreddine Bencherchali (Nextron Systems)Created Tue Aug 02Updated Sun Oct 197d1aaf3d-4304-425c-b7c3-162055e0b3abwindows

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_iwr:
        Image|endswith:
            - '\powershell_ise.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\cmd.exe'
        CommandLine|contains:
            - 'curl '
            - 'Invoke-RestMethod'
            - 'Invoke-WebRequest'
            - 'irm '
            - 'iwr '
            - 'wget '
        CommandLine|contains|all:
            - ' -ur' # Shortest possible version of the -uri flag
            - ' -me' # Shortest possible version of the -method flag
            - ' -b'
            - ' POST '
    selection_curl:
        Image|endswith: '\curl.exe'
        CommandLine|contains: '--ur' # Shortest possible version of the --uri flag
    selection_curl_data:
        CommandLine|contains:
            - ' -d ' # Shortest possible version of the --data flag
            - ' --data '
    selection_wget:
        Image|endswith: '\wget.exe'
        CommandLine|contains:
            - '--post-data'
            - '--post-file'
    payloads:
        - CommandLine|re:
              - 'net\s+view'
              - 'sc\s+query'
        - CommandLine|contains:
              - 'Get-Content'
              - 'GetBytes'
              - 'hostname'
              - 'ifconfig'
              - 'ipconfig'
              - 'netstat'
              - 'nltest'
              - 'qprocess'
              - 'systeminfo'
              - 'tasklist'
              - 'ToBase64String'
              - 'whoami'
        - CommandLine|contains|all:
              - 'type '
              - ' > '
              - ' C:\'
    condition: (selection_iwr or all of selection_curl* or selection_wget) and payloads