Elastic medium stable eql

Java Dropped and Executed With DNS Lookup

Identifies a recently dropped or modified javaw.exe process started from a user-writable path to run a JAR or Java classpath application, followed by a DNS lookup. Adversaries may drop Java payloads into user directories and execute them immediately to establish command and control while evading application control focused on native Windows binaries.

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Detection Logic

sequence by process.entity_id with maxspan=1m
 [process where host.os.type == "windows" and event.action == "start" and
  (process.Ext.relative_file_creation_time <= 500 or process.Ext.relative_file_name_modify_time <= 500) and
  (process.name : "javaw.exe" or process.pe.original_file_name == "javaw.exe") and process.executable : ("?:\\Users\\*", "?:\\ProgramData\\*", "?:\\Windows\\Temp\\*") and user.id != "S-1-5-18" and
  (
   (process.args_count == 3 and process.args : "-jar") or
   (process.args_count == 4 and process.args : ("-cp", "-classpath") and process.command_line : " *.* ")
  )]
 [network where host.os.type == "windows" and event.action: "lookup_requested"]

Field Validations

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