mirror of
https://github.com/splunk/security_content
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Bhavin Patel
68 lines
2.2 KiB
YAML
68 lines
2.2 KiB
YAML
name: Linux Ingress Tool Transfer with Curl
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id: 8c1de57d-abc1-4b41-a727-a7a8fc5e0857
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version: 1
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date: '2022-07-29'
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author: Michael Haag, Splunk
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status: production
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type: Anomaly
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description: The following analytic identifies curl with the command-line switches
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that are commonly used to download, output, a remote script or binary. MetaSploit
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Framework will combine the -sO switch with | chmod +x to enable a simple one liner
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to download and set the execute bit to run the file immediately. During triage,
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review the remote domain and file being downloaded for legitimacy.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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Image|endswith: curl
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condition: selection1
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: False positives will be present. Tune and then change type
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to TTP.
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references:
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- https://gtfobins.github.io/gtfobins/curl/
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- https://curl.se/docs/manpage.html#-I
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- https://gtfobins.github.io/gtfobins/curl/
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- https://github.com/rapid7/metasploit-framework/search?q=curl
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tags:
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analytic_story:
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- Linux Living Off The Land
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- Ingress Tool Transfer
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asset_type: Endpoint
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confidence: 30
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impact: 40
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message: An instance of $process_name$ was identified on endpoint $dest$ by user
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$user$ to download a remote file. Review activity for further details.
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mitre_attack_id:
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- T1105
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observable:
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- name: user
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type: User
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role:
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- Victim
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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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- name: process_name
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type: Process
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role:
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- Child Process
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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: 12
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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/T1105/atomic_red_team/curl-linux-sysmon.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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update_timestamp: true
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