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Newest: 2.0.2

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Active Rule

UNC4841 - Barracuda ESG Exploitation Indicators

sigma-cli version

Backend

Format

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

UNC4841 - Barracuda ESG Exploitation Indicators

Using Splunk · Default · sigma-cli 2.0.2

Translation controls

Adjust the rule on the left, then regenerate when you want a fresh backend-native query.

BackendSplunkFormatDefaultVersion2.0.2

title: UNC4841 - Barracuda ESG Exploitation Indicators
id: 5627c337-a9b2-407a-a82d-5fd97035ff39
status: test
description: Detects file indicators as seen used by UNC4841 during their Barracuda ESG zero day exploitation.
references:
    - https://www.mandiant.com/resources/blog/barracuda-esg-exploited-globally
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-16
modified: 2025-08-19
tags:
    - attack.execution
    - attack.persistence
    - attack.defense-evasion
    - detection.emerging-threats
logsource:
    product: linux
    category: file_event
detection:
    selection:
        TargetFilename|endswith:
            - '/11111.tar'
            - '/aacore.sh'
            - '/appcheck.sh'
            - '/autoins'
            - '/BarracudaMailService'
            - '/etc/cron.daily/core_check.sh'
            - '/etc/cron.daily/core.sh'
            - '/etc/cron.hourly/aacore.sh'
            - '/etc/cron.hourly/appcheck.sh'
            - '/etc/cron.hourly/core.sh'
            - '/get_fs_info.pl'
            - '/imgdata.jpg'
            - '/install_att_v2.tar'
            - '/install_bvp74_auth.tar'
            - '/install_helo.tar'
            - '/install_reuse.tar'
            - '/intent_helo'
            - '/intent_reuse'
            - '/intentbas'
            # - '/mknod'
            - '/mod_attachment.lua'
            - '/mod_content.lua'
            - '/mod_require_helo.lua'
            - '/mod_rtf'
            - '/mod_sender.lua'
            - '/mod_udp.so'
            - '/nfsd_stub.ko'
            - '/resize_reisertab'
            - '/resize_risertab'
            - '/resize2fstab'
            - '/rverify'
            - '/saslautchd'
            - '/sendscd'
            - '/snapshot.tar'
            - '/tmp/p'
            - '/tmp/p7'
            - '/tmp/t'
            - '/update_v2.sh'
            - '/update_v31.sh'
            - '/update_v35.sh'
            - '/update_version'
    condition: selection
falsepositives:
    - Unlikely
level: high

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules-emerging-threats/2023/TA/UNC4841-Barracuda-ESG-Zero-Day-Exploitation/file_event_lnx_apt_unc4841_file_indicators.yml