mirror of
https://github.com/splunk/security_content
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Bhavin Patel
57 lines
2.0 KiB
YAML
57 lines
2.0 KiB
YAML
name: Linux Possible Ssh Key File Creation
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id: c04ef40c-72da-11ec-8eac-acde48001122
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version: 1
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date: '2022-01-11'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic is to look for possible ssh key file creation on ~/.ssh/
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folder. This technique is commonly abused by threat actors and adversaries to gain
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persistence and privilege escalation to the targeted host. by creating ssh private
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and public key and passing the public key to the attacker server. threat actor can
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access remotely the machine using openssh daemon service.
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data_source:
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- Sysmon Event ID 11
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search:
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selection1:
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TargetFilename: '*/.ssh*'
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condition: selection1
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the file name, file path, and process_guid executions from your endpoints.
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If you are using Sysmon, you can use the Add-on for Linux Sysmon from Splunkbase.
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known_false_positives: Administrator or network operator can create file in ~/.ssh
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folders for automation purposes. Please update the filter macros to remove false
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positives.
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references:
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- https://www.hackingarticles.in/ssh-penetration-testing-port-22/
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- https://attack.mitre.org/techniques/T1098/004/
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tags:
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analytic_story:
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- Linux Privilege Escalation
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- Linux Persistence Techniques
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- Linux Living Off The Land
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asset_type: Endpoint
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confidence: 60
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impact: 60
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message: A file $file_name$ is created in $file_path$ on $dest$
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mitre_attack_id:
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- T1098.004
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- T1098
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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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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risk_score: 36
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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/T1098.004/ssh_authorized_keys/sysmon_linux.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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