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https://github.com/splunk/security_content
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Raven Tait
64 lines
2.7 KiB
YAML
64 lines
2.7 KiB
YAML
name: ESXi Reverse Shell Patterns
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id: ee8b16a4-118e-4dd7-af4b-835530415610
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version: 1
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date: '2025-05-12'
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author: Raven Tait, Splunk
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status: production
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type: TTP
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description: This detection looks for reverse shell string patterns on an ESXi
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host, which may indicate that a threat actor is attempting to establish
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remote control over the system.
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data_source:
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- VMWare ESXi Syslog
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search: '`esxi_syslog` Message IN ("*bash -i >&*","*/dev/tcp/*","*/dev/udp/*",
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"*/socat exec:*","*socket(S,PF_INET*") OR (Message="*python -c*" AND Message="*import socket*")
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| rex field=_raw "Z (?<dest>[\w\.]+)\s"
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| stats min(_time) as firstTime max(_time) as lastTime count by dest Message
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `esxi_reverse_shell_patterns_filter`'
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how_to_implement: This is based on syslog data generated by VMware ESXi hosts. To implement this search,
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you must configure your ESXi systems to forward syslog output to your Splunk deployment. These logs must
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be ingested with the appropriate Splunk Technology Add-on for VMware ESXi Logs, which provides field
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extractions and CIM compatibility.
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known_false_positives: Limited false positives in most environments, however tune
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as needed.
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Reverse shell patterns seen on ESXi host $dest$.
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risk_objects:
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- field: dest
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type: system
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score: 75
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threat_objects: []
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tags:
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analytic_story:
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- ESXi Post Compromise
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- Black Basta Ransomware
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asset_type: Infrastructure
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mitre_attack_id:
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- T1059
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059/esxi_reverse_shell/esxi_reverse_shell.log
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source: vmware:esxlog
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sourcetype: vmw-syslog
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