Unusual Instance Metadata Service (IMDS) API Request
editUnusual Instance Metadata Service (IMDS) API Request
editThis rule identifies potentially malicious processes attempting to access the cloud service provider’s instance metadata service (IMDS) API endpoint, which can be used to retrieve sensitive instance-specific information such as instance ID, public IP address, and even temporary security credentials if role’s are assumed by that instance. The rule monitors for various tools and scripts like curl, wget, python, and perl that might be used to interact with the metadata API.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Credential Access
- Tactic: Discovery
- Data Source: Elastic Defend
Version: 2
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence 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 : ( "curl", "wget", "python*", "perl*", "php*", "ruby*", "lua*", "telnet", "pwsh", "openssl", "nc", "ncat", "netcat", "awk", "gawk", "mawk", "nawk", "socat", "node" ) 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: ( "/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/rumble/bin/rumble-agent*", "/opt/aws/inspector/bin/inspectorssmplugin") or process.parent.executable: ( "/usr/bin/setup-policy-routes", "/usr/share/ec2-instance-connect/*", "/var/lib/amazon/ssm/*") ) ] [network where host.os.type == "linux" and event.action == "connection_attempted" and destination.ip == "169.254.169.254"]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
-
Technique:
- Name: Unsecured Credentials
- ID: T1552
- Reference URL: https://attack.mitre.org/techniques/T1552/
-
Sub-technique:
- Name: Cloud Instance Metadata API
- ID: T1552.005
- Reference URL: https://attack.mitre.org/techniques/T1552/005/
-
Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
-
Technique:
- Name: Cloud Infrastructure Discovery
- ID: T1580
- Reference URL: https://attack.mitre.org/techniques/T1580/