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[Tuning] Unusual Instance Metadata Service (IMDS) API Request #4418

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Merged
merged 4 commits into from
Jan 24, 2025
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[Tuning] Unusual Instance Metadata Service (IMDS) API Request #4418

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Update credential_access_unusual_instance_metadata_service_api_reques…
Samirbous Jan 24, 2025
5a67adb
Update credential_access_unusual_instance_metadata_service_api_reques…
Samirbous Jan 24, 2025
926f191
Update credential_access_unusual_instance_metadata_service_api_reques…
Samirbous Jan 24, 2025
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Update rules/linux/credential_access_unusual_instance_metadata_servic…
Samirbous Jan 24, 2025
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34 changes: 20 additions & 14 deletions rules/linux/credential_access_unusual_instance_metadata_service_api_request.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
creation_date = "2024/08/22"
integration = ["endpoint"]
maturity = "production"
updated_date = "2025/01/15"
updated_date = "2025/01/24"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -34,34 +34,40 @@ type = "eql"

query = '''
sequence by host.id, process.parent.entity_id with maxspan=1s
[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.name : (
[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
process.parent.executable != null and
(
process.name : (
"curl", "wget", "python*", "perl*", "php*", "ruby*", "lua*", "telnet", "pwsh",
"openssl", "nc", "ncat", "netcat", "awk", "gawk", "mawk", "nawk", "socat", "node"
) or process.executable : (
) or
process.executable : (
"./*", "/tmp/*", "/var/tmp/*", "/var/www/*", "/dev/shm/*", "/etc/init.d/*", "/etc/rc*.d/*",
"/etc/cron*", "/etc/update-motd.d/*", "/boot/*", "/srv/*", "/run/*", "/etc/rc.local"
) or
process.command_line: "*169.254.169.254*" and
not (process.working_directory: (
process.command_line: "*169.254.169.254*"
)
and not process.working_directory: (
"/opt/rapid7*",
"/opt/nessus*",
"/snap/amazon-ssm-agent*",
"/var/snap/amazon-ssm-agent/*",
"/var/log/amazon/ssm/*",
"/srv/snp/docker/overlay2*",
"/opt/nessus_agent/var/nessus/*") or
process.executable: (
"/opt/nessus_agent/var/nessus/*")
and not process.executable: (
"/opt/rumble/bin/rumble-agent*",
"/opt/aws/inspector/bin/inspectorssmplugin") or
process.parent.executable: (
"/opt/aws/inspector/bin/inspectorssmplugin")
and not process.parent.executable: (
"/usr/bin/setup-policy-routes",
"/usr/share/ec2-instance-connect/*",
"/var/lib/amazon/ssm/*")
)
"/var/lib/amazon/ssm/*",
"/etc/update-motd.d/30-banner",
"/usr/sbin/dhclient-script",
"/usr/local/bin/uwsgi",
"/usr/lib/skylight/al-extras")
]
[network where host.os.type == "linux"
and event.action == "connection_attempted"
and destination.ip == "169.254.169.254"]
[network where host.os.type == "linux" and event.action == "connection_attempted" and destination.ip == "169.254.169.254"]
'''
note = """## Triage and analysis

Expand Down
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