Cisco Secure Firewall - Veeam CVE-2023-27532 Exploitation Activity

name: Cisco Secure Firewall - Veeam CVE-2023-27532 Exploitation Activity
id: 7b7c2e92-f0b2-48d2-9c9b-b8de52b6b2ae
version: 7
creation_date: '2025-04-16'
modification_date: '2026-05-13'
author: Nasreddine Bencherchali, Splunk, Talos NTDR
status: production
type: TTP
description: |
    This analytic detects exploitation activity of CVE-2023-27532 using Cisco Secure Firewall Intrusion Events.
    It leverages Cisco Secure Firewall Threat Defense IntrusionEvent logs to identify cases where Snort signature 61514 (Veeam Backup and Replication credential dump attempt)
    is followed within a 5-minute window by 64795 (Veeam Backup and Replication xp_cmdshell invocation attempt), which detects the use of `xp_cmdshell`, a common post-exploitation technique.
    If confirmed malicious, this behavior is highly indicative of a successful exploitation of CVE-2023-27532, followed by remote command execution or credential dumping.
data_source:
    - Cisco Secure Firewall Threat Defense Intrusion Event
search: |
    `cisco_secure_firewall` EventType=IntrusionEvent signature_id IN (61514, 64795)
    | bin _time span=5m
    | fillnull
    | stats dc(signature_id) as unique_signature_count
            values(signature_id) as signature_id
            values(signature) as signature
            values(class_desc) as class_desc
            values(MitreAttackGroups) as MitreAttackGroups
            values(InlineResult) as InlineResult
            values(InlineResultReason) as InlineResultReason
            values(src) as src
            values(dest_port) as dest_port
            values(rule) as rule
            values(transport) as transport
            values(app) as app
            min(_time) as firstTime
            max(_time) as lastTime
            by dest
    | where unique_signature_count = 2
    | `security_content_ctime(firstTime)`
    | `security_content_ctime(lastTime)`
    | `cisco_secure_firewall___veeam_cve_2023_27532_exploitation_activity_filter`
how_to_implement: |
    This search requires Cisco Secure Firewall Threat Defense Logs, which
    includes the IntrusionEvent EventType. This search uses an input macro named `cisco_secure_firewall`.
    We strongly recommend that you specify your environment-specific configurations
    (index, source, sourcetype, etc.) for Cisco Secure Firewall Threat Defense logs. Replace the macro definition
    with configurations for your Splunk environment. The search also uses a post-filter
    macro designed to filter out known false positives.
    The logs are to be ingested using the Splunk Add-on for Cisco Security Cloud (https://splunkbase.splunk.com/app/7404).
    The intrusion access policy must also be configured.
known_false_positives: False positives should be very unlikely.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2023-27532
    - https://www.veeam.com/kb4424
drilldown_searches:
    - name: View the detection results for - "$dest$" and "$src$"
      search: '%original_detection_search% | search  dest = "$dest$" and src = "$src$"'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
    - name: View risk events for the last 7 days for - "$dest$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
      earliest_offset: 7d
      latest_offset: "0"
finding:
    title: Exploitation attempt of Veeam CVE-2023-27532 on host $dest$ by $src$.
    entity:
        field: dest
        type: system
        score: 50
threat_objects:
    - field: signature
      type: signature
    - field: src
      type: ip_address
analytic_story:
    - Cisco Secure Firewall Threat Defense Analytics
asset_type: Network
mitre_attack_id:
    - T1190
    - T1210
    - T1059.001
    - T1003.001
product:
    - Splunk Enterprise
    - Splunk Cloud
    - Splunk Enterprise Security
category: network
security_domain: network
tests:
    - name: True Positive Test
      attack_data:
        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/cisco_secure_firewall_threat_defense/intrusion_event/intrusion_events.log
          source: not_applicable
          sourcetype: cisco:sfw:estreamer
      test_type: unit