Linux system firewall was modified

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-04
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

Deduplication Period

1 Hour

Required Data

  • Requires:
    • XDR Agent
  • Requires:
    • eXtended Threat Hunting (XTH)

Detection Modules

ATT&CK Tactic

Defense Evasion (TA0005)

ATT&CK Technique

Impair Defenses: Disable or Modify System Firewall (T1562.004)

Severity

Low

Description

The system firewall was modified.

Attacker's Goals

Exfiltrate data or move laterally in the organization.

Investigative actions

  • Examine the command to understand which IPs or ports were affected.
  • Check the communication allowed by the modified firewall rule.