Elastic Defend high stable eql

Suspicious Python Script Execution and Network Connection

Detects when Python is executed containing arguments containing suspicious file paths followed immediately by a Python network connection. We have observed malware samples that drop and execute a Python script within a suspicious directory in order to establish C2.

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Detection Logic

sequence by process.entity_id with maxspan=15s
[process where event.type == "start" and event.action == "exec" and process.name like~ "python*" and process.args like~ "python*" and 
  process.args like ("/Users/Shared/*", "/tmp/*", "/private/var/tmp/*", "/var/tmp/*") and process.args_count <= 3 and 
  not (process.parent.name in ("zsh", "bash", "sh", "fish", "tcsh") and
        process.parent.command_line in ("-bash", "-zsh", "-sh", "-fish", "-tcsh") and
        process.parent.executable : ("/bin/zsh", "/bin/bash", "/bin/sh", "/opt/homebrew/*", "/usr/local/*") and
        process.code_signature.trusted == true) and
  not process.Ext.effective_parent.executable like (
        "/Applications/Visual Studio Code.app/*",
        "/Applications/Cursor.app/*",
        "/Applications/PyCharm.app/*",
        "/Applications/PyCharm CE.app/*",
        "/Applications/Windsurf.app/*",
        "/Applications/Codex.app/*",
        "/Applications/Emacs.app/*",
        "/Applications/IntelliJ IDEA.app/*",
        "/Users/*/Applications/IntelliJ IDEA.app/*",
        "/Applications/Android Studio.app/*",
        "/Applications/cmux.app/*",
        "/Applications/ChatGPT.app/*",
        "/Users/*/Library/Application Support/Claude/*") and
  not (process.parent.name in ("zsh", "bash", "sh") and process.parent.command_line : (
    "*/.claude/shell-snapshots/*",
    "*/.codex/shell_snapshots/*",
    "*/.cursor/shell-snapshots/*"))]
[network where event.type == "start" and
   not destination.domain : ("dl.google.com", "*.cloud.es.io", "*.elastic-cloud.com", "elastic.co", "www.elastic.co") and
   not cidrmatch(destination.ip, 
       "240.0.0.0/4", "233.252.0.0/24", "224.0.0.0/4", "198.19.0.0/16", "192.18.0.0/15", 
       "192.0.0.0/24", "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", 
       "192.0.2.0/24", "192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", 
       "100.64.0.0/10", "192.175.48.0/24", "198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24",
       "::1", "FE80::/10", "FF00::/8")]

Field Validations

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