Git Hook Egress Network Connection

Last updated 7 months ago on 2025-01-15
Created a year ago on 2024-07-15

About

This rule detects a suspicious egress network connection attempt from a Git hook script. Git hooks are scripts that Git executes before or after events such as: commit, push, and receive. An attacker can abuse these features to execute arbitrary commands on the system, establish persistence or to initialize a network connection to a remote server and exfiltrate data or download additional payloads.
Tags
Domain: EndpointOS: LinuxUse Case: Threat DetectionTactic: PersistenceTactic: ExecutionTactic: Defense EvasionData Source: Elastic DefendLanguage: eql
Severity
medium
Risk Score
47
MITRE ATT&CK™

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

Execution (TA0002)(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.process*logs-endpoint.events.network*
Related Integrations

endpoint(opens in a new tab or window)

Query
sequence by host.id with maxspan=3s
  [process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
   process.parent.name == "git" and process.args : ".git/hooks/*" and
   process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")] by process.entity_id
  [network where host.os.type == "linux" and event.type == "start" and event.action == "connection_attempted" and not (
     destination.ip == null or destination.ip == "0.0.0.0" or cidrmatch(
       destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24", "192.0.0.0/29",
       "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
       "192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
       "192.175.48.0/24","198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
       "FF00::/8", "172.31.0.0/16"
     )
   )
  ] by process.parent.entity_id

Install detection rules in Elastic Security

Detect Git Hook Egress Network Connection 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).