Elastic medium stable eql

Perl Outbound Network Connection

Detects when Perl makes an outbound network connection to a non-private IP address. Perl is a scripting language that comes pre-installed on macOS and offers extensive capabilities for adversaries. Its use for network connections on macOS systems is uncommon and potentially suspicious.

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Detection Logic

sequence by process.entity_id with maxspan=30s
  [process where host.os.type == "macos" and event.type == "start" and event.action == "exec" and
    process.name == "perl" and not process.args like "/usr/bin/xpath"]
  [network where host.os.type == "macos" and event.type == "start" and process.name == "perl" and
    not cidrmatch(destination.ip, 
        "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", 
        "192.0.0.0/24", "192.0.2.0/24", "192.168.0.0/16", "192.88.99.0/24",
        "224.0.0.0/4", "240.0.0.0/4", "::1", "FE80::/10", "FF00::/8")]

Field Validations

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