detection-rules
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Potential Memory Seeking Activity

Monitors for the execution of Unix utilities that may be leveraged as memory address seekers. Attackers may leverage built-in utilities to seek specific memory addresses, allowing for potential future manipulation/exploitation.

Rule type: eql
Rule indices:

  • logs-endpoint.events.*
  • endgame-*

Rule Severity: low
Risk Score: 21
Runs every:
Searches indices from: now-9m
Maximum alerts per execution: ?
References:

Tags:

  • Domain: Endpoint
  • OS: Linux
  • Use Case: Threat Detection
  • Tactic: Discovery
  • Rule Type: BBR
  • Data Source: Elastic Defend
  • Data Source: Elastic Endgame

Version: ?
Rule authors:

  • Elastic

Rule license: Elastic License v2

process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event") and (
  (process.name == "tail" and process.args in ("-c", "--bytes")) or
  (process.name == "cmp" and process.args == "-i") or
  (process.name in ("hexdump", "xxd") and process.args == "-s") or
  (process.name == "dd" and process.args : ("skip*", "seek*"))
) and not (
  process.parent.args like ("/opt/error_monitor/error_monitor.sh", "printf*", "/sbin/dracut") or
  process.parent.name in ("acme.sh", "dracut", "leapp") or
  process.parent.executable like (
    "/bin/cagefs_enter", "/opt/nessus_agent/sbin/nessus-service", "/usr/libexec/platform-python*",
    "/usr/libexec/vdsm/vdsmd", "/usr/local/bin/docker-entrypoint.sh", "/usr/lib/module-init-tools/lsinitrd-quick",
    "/usr/bin/unmkinitramfs", "/usr/bin/lsinitramfs", "/opt/msp-agent/msp-agent-core.run",
    "/usr/local/cloudamize/bin/register.sh", "/usr/local/hestia/bin/v-log-action", "/usr/local/emps/bin/php"
  ) or
  process.parent.command_line like "sh*acme.sh*" or
  process.args like ("/var/tmp/dracut*", "/opt/bitdefender-security-tools/var/log/script_update.log") or
  ?process.working_directory like (
    "/usr/local/nutanix/ngt/python/bin", "/var/lib/waagent/*", "/opt/Tychon/Endpoint/bin",
    "/usr/local/cloudamize/bin", "/opt/sentinelone/bin"
  ) or
  process.command_line in ("tail -c 1", "tail -c 2") or
  (process.command_line == "dd ibs=18850 skip=1 count=1" and process.parent.args == "/opt/msp-agent/msp-agent-core.run")
)

Framework: MITRE ATT&CK