Yum Package Manager Plugin File Creation

Last updated 7 months ago on 2025-01-24
Created a year ago on 2024-06-25

About

Detects file creation events in the plugin directories for the Yum package manager. In Linux, Yum (Yellowdog Updater, Modified) is a command-line utility used for handling packages on (by default) Fedora-based systems, providing functions for installing, updating, upgrading, and removing software along with managing package repositories. Attackers can backdoor Yum to gain persistence by injecting malicious code into plugins that Yum runs, thereby ensuring continued unauthorized access or control each time Yum is used for package management.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: PersistenceTactic: Defense EvasionData Source: Elastic DefendLanguage: eql
Severity
low
Risk Score
21
MITRE ATT&CK™

Persistence (TA0003)(opens in a new tab or window)

Defense Evasion (TA0005)(opens in a new tab or window)

License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.file*
Related Integrations

endpoint(opens in a new tab or window)

Query
file where host.os.type == "linux" and event.action in ("rename", "creation") and
file.path : ("/usr/lib/yum-plugins/*", "/etc/yum/pluginconf.d/*") and not (
  process.executable in (
    "/bin/dockerd", "/usr/bin/dockerd", "/usr/sbin/dockerd", "/bin/microdnf", "/usr/bin/microdnf", "/bin/rpm",
    "/usr/bin/rpm", "/bin/snapd", "/usr/bin/snapd", "/bin/yum", "/usr/bin/yum", "/bin/dnf", "/usr/bin/dnf",
    "/bin/podman", "/usr/bin/podman", "/bin/dnf-automatic", "/usr/bin/dnf-automatic", "/sbin/apk", "/usr/sbin/apk",
    "/usr/local/sbin/apk", "/bin/podman", "/usr/bin/podman", "/usr/bin/puppet", "/bin/puppet",
    "/opt/puppetlabs/puppet/bin/puppet", "/usr/bin/chef-client", "/bin/chef-client", "/bin/autossl_check",
    "/usr/bin/autossl_check", "/proc/self/exe", "/dev/fd/*", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd",
    "/usr/libexec/netplan/generate"
  ) or
  process.name in ("yumBackend.py", "crio") or
  file.extension in ("swp", "swpx", "swx") or
  file.Ext.original.name like ".ansible*" or
  file.name like ".ansible_tmp*" or
  process.executable : (
    "/nix/store/*", "/var/lib/dpkg/*", "/tmp/vmis.*", "/snap/*", "/dev/fd/*", "/usr/lib/*", "/usr/libexec/*",
    "/etc/kernel/*"
  ) or
  process.executable == null or
  (process.name == "sed" and file.name : "sed*") or
  (process.name == "perl" and file.name : "e2scrub_all.tmp*")
)

Install detection rules in Elastic Security

Detect Yum Package Manager Plugin File Creation in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).