UNC4841 - Email Exfiltration File Pattern

title: UNC4841 - Email Exfiltration File Pattern
id: 0785f462-60b0-4031-9ff4-b4f3a0ba589a
status: test
description: Detects filename pattern of email related data used by UNC4841 for staging and exfiltration
references:
    - https://www.mandiant.com/resources/blog/barracuda-esg-exploited-globally
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-16
tags:
    - attack.execution
    - attack.persistence
    - detection.emerging-threats
    - attack.stealth
logsource:
    product: linux
    category: file_event
detection:
    selection:
        TargetFilename|re: '/mail/tmp/[a-zA-Z0-9]{3}[0-9]{3}\.tar\.gz'
    condition: selection
falsepositives:
    - Unknown
level: high