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System Binary Copied and/or Moved to Suspicious Directory

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System Binary Copied and/or Moved to Suspicious Directory

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This rule monitors for the copying or moving of a system binary to a suspicious directory. Adversaries may copy/move and rename system binaries to evade detection. Copying a system binary to a different location should not occur often, so if it does, the activity should be investigated.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Defend

Version: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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sequence by host.id, process.entity_id with maxspan=1s
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
   process.name in ("cp", "mv") and process.args : (
   // Shells
   "/bin/*sh", "/usr/bin/*sh",

   // Interpreters
   "/bin/python*", "/usr/bin/python*", "/bin/php*", "/usr/bin/php*", "/bin/ruby*", "/usr/bin/ruby*", "/bin/perl*",
   "/usr/bin/perl*", "/bin/lua*", "/usr/bin/lua*", "/bin/java*", "/usr/bin/java*",

   // Compilers
   "/bin/gcc*", "/usr/bin/gcc*", "/bin/g++*", "/usr/bin/g++*", "/bin/cc", "/usr/bin/cc",

   // Suspicious utilities
   "/bin/nc", "/usr/bin/nc", "/bin/ncat", "/usr/bin/ncat", "/bin/netcat", "/usr/bin/netcat", "/bin/nc.openbsd",
   "/usr/bin/nc.openbsd", "/bin/*awk", "/usr/bin/*awk", "/bin/socat", "/usr/bin/socat", "/bin/openssl",
   "/usr/bin/openssl", "/bin/telnet", "/usr/bin/telnet", "/bin/mkfifo", "/usr/bin/mkfifo", "/bin/mknod",
   "/usr/bin/mknod", "/bin/ping*", "/usr/bin/ping*", "/bin/nmap", "/usr/bin/nmap",

   // System utilities
   "/bin/ls", "/usr/bin/ls", "/bin/cat", "/usr/bin/cat", "/bin/sudo", "/usr/bin/sudo", "/bin/curl", "/usr/bin/curl",
   "/bin/wget", "/usr/bin/wget", "/bin/tmux", "/usr/bin/tmux", "/bin/screen", "/usr/bin/screen", "/bin/ssh",
   "/usr/bin/ssh", "/bin/ftp", "/usr/bin/ftp"
  ) and not process.parent.name in ("dracut-install", "apticron", "generate-from-dir", "platform-python")]
  [file where host.os.type == "linux" and event.action == "creation" and file.path : (
    "/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*", "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*"
  ) and not file.path : "/tmp/rear*"]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Hide Artifacts
- ID: T1564
- Reference URL: https://attack.mitre.org/techniques/T1564/
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
Sub-technique:
- Name: Rename System Utilities
- ID: T1036.003
- Reference URL: https://attack.mitre.org/techniques/T1036/003/

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