from logs-endpoint.events.network-*
| where
@timestamp > now() - 1h and
host.os.type == "linux" and
event.type == "start" and
event.action == "connection_attempted" and
(
process.executable like "/tmp/*" or
process.executable like "/var/tmp/*" or
process.executable like "/dev/shm/*" or
process.name rlike ".*"
) and not (
cidr_match(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", "192.0.0.29/32", "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"
) or
process.executable like "/nix/store/*" or
process.executable like "/tmp/newroot/*" or
process.executable like "/tmp/.mount*" or
process.executable like "/tmp/go-build*"
)
| keep
@timestamp,
host.os.type,
event.type,
event.action,
process.name,
process.executable,
destination.ip,
agent.id,
host.name
| stats
Esql.event_count = count(),
Esql.agent_id_count_distinct = count_distinct(agent.id),
Esql.host_name_values = values(host.name),
Esql.agent_id_values = values(agent.id)
by process.executable
| where
Esql.agent_id_count_distinct == 1 and
Esql.event_count > 15
| sort Esql.event_count asc
| limit 100
Install detection rules in Elastic Security
Detect High Number of Egress Network Connections from Unusual Executable in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).