Name:Cisco Secure Firewall - Veeam CVE-2023-27532 Exploitation Activity id:7b7c2e92-f0b2-48d2-9c9b-b8de52b6b2ae version:1 date:2025-04-14 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:
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_ip) as src_ip 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_ip | 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 - "$dest_ip$" and "$src_ip$"' search:'%original_detection_search% | search dest_ip = "$dest_ip$" and src_ip = "$src_ip$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest_ip$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest_ip$") starthoursago=168 | 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:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Cisco Secure Firewall Threat Defense Analytics' asset_type:Network security_domain:network mitre_attack_id: - 'T1190' - 'T1210' - 'T1059.001' - 'T1003.001' product: - 'Splunk Enterprise' - 'Splunk Cloud' - 'Splunk Enterprise Security'
