splApache-2.0from splunk/security_content

Linux File Creation In Init Boot Directory

The following analytic detects the creation of files in Linux init boot directories, which are used for automatic execution upon system startup. It leverages file system logs to identify new files in directories such as /etc/init.d/ and /etc/rc.d/. This activity is significant as it is a common persistence technique used by adversaries, malware authors, and red teamers. If confirmed malicious, this could allow an attacker to maintain persistence on the compromised host, potentially leading to further exploitation and unauthorized control over the system.

Quality

FP risk

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Rule sourcedetections/endpoint/linux_file_creation_in_init_boot_directory.yml

| tstats `security_content_summariesonly`
  count min(_time) as firstTime
        max(_time) as lastTime

FROM datamodel=Endpoint.Filesystem WHERE

Filesystem.action = "created"
Filesystem.file_path IN (
    "*/etc/init.d/*",
    "*/etc/rc.d/*",
    "*/etc/rc.local*",
    "*/sbin/init.d/*"
)
BY Filesystem.action Filesystem.dest Filesystem.file_access_time
   Filesystem.file_create_time Filesystem.file_hash Filesystem.file_modify_time
   Filesystem.file_name Filesystem.file_path Filesystem.file_acl
   Filesystem.file_size Filesystem.process_guid Filesystem.process_id
   Filesystem.user Filesystem.vendor_product

| `drop_dm_object_name(Filesystem)`
| `security_content_ctime(lastTime)`
| `security_content_ctime(firstTime)`
| `linux_file_creation_in_init_boot_directory_filter`