Elastic medium stable eql

Egress Connection from Entrypoint in Container

This rule identifies a sequence of events where a process named "entrypoint.sh" is started in a container, followed by a network connection attempt. This sequence indicates a potential egress connection from an entrypoint in a container. An entrypoint is a command or script specified in the Dockerfile and executed when the container starts. Attackers can use this technique to establish a foothold in the environment, escape from a container to the host, or establish persistence.

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Detection Logic

sequence by host.id with maxspan=3s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
   process.entry_leader.entry_meta.type == "container" and process.name == "entrypoint.sh"] by process.entity_id
  [network where event.type == "start" and event.action == "connection_attempted" and process.executable != null and
   not (
     destination.ip == null or destination.ip == "0.0.0.0" or 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", "192.0.0.0/29",
       "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "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", "224.0.0.0/4", "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", "240.0.0.0/4", "::1", "FE80::/10",
       "FF00::/8", "172.31.0.0/16"
       ) or
    // Excluding vast majority of noise
    (process.name like ("python*", "pip*") and destination.port == 443)
    )] by process.parent.entity_id

Field Validations

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