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« File Creation Time Changed File Deletion via Shred »

File Creation, Execution and Self-Deletion in Suspicious Directoryedit

This rule monitors for the creation of a file, followed by its execution and self-deletion in a short timespan within a directory often used for malicious purposes by threat actors. This behavior is often used by malware to execute malicious code and delete itself to hide its tracks.

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: None

Tags:

  • Domain: Endpoint
  • OS: Linux
  • Use Case: Threat Detection
  • Tactic: Execution
  • Data Source: Elastic Defend

Version: 3

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

sequence by host.id, user.id with maxspan=1m
  [file where host.os.type == "linux" and event.action == "creation" and
   process.name in ("curl", "wget", "fetch", "ftp", "sftp", "scp", "rsync", "ld") and
   file.path : ("/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*",
     "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*")] by file.name
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
   process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")] by process.name
  [file where host.os.type == "linux" and event.action == "deletion" and not process.name in ("rm", "ld") and
   file.path : ("/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*",
     "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*")] by file.name

Framework: MITRE ATT&CKTM

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