Rare communication over email ports to external email server by unsigned process

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

Detection Modules

ATT&CK Tactic

Command and Control (TA0011)

ATT&CK Technique

Non-Application Layer Protocol (T1095)

Severity

Low

Description

These methods are used by malware and attackers to leak data and remain undetected.

Attacker's Goals

Attackers might use well-known email ports as a C&C channel to evade detection and firewall rules.

Investigative actions

  • Check whether the initiator process is benign or normal for the host and/or user performing it.
  • Check whether additional malicious commands were executed from the same process.