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Detection rules › Sigma

UNC4841 - Potential SEASPY Execution

Status
test
Severity
critical
Log source
category process_creation, product linux
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects execution of specific named binaries which were used by UNC4841 to deploy their SEASPY backdoor

Known false positives

  • Unlikely

MITRE ATT&CK coverage

TacticTechniques
ExecutionNo specific technique

Telemetry coverage

PlatformRecord / event type
LinuxEvent ID 1: Process Create

Rule body

title: UNC4841 - Potential SEASPY Execution
id: f6a711f3-d032-4f9e-890b-bbe776236c84
status: test
description: Detects execution of specific named binaries which were used by UNC4841 to deploy their SEASPY backdoor
references:
    - https://www.mandiant.com/resources/blog/barracuda-esg-exploited-globally
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-16
tags:
    - attack.execution
    - detection.emerging-threats
logsource:
    product: linux
    category: process_creation
detection:
    selection:
        Image|endswith:
            - '/BarracudaMailService'
            - '/resize2fstab'
            - '/resize_reisertab'
    condition: selection
falsepositives:
    - Unlikely
level: critical

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith:
        - '/BarracudaMailService'
        - '/resize2fstab'
        - '/resize_reisertab'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Imageends_with
  • /BarracudaMailService
  • /resize2fstab
  • /resize_reisertab
field:"Image" kind:ends_with