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P4T12ICK
85 lines
2.9 KiB
YAML
85 lines
2.9 KiB
YAML
name: Linux Curl Upload File
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id: c1de2d9a-0c02-4bb4-a49a-510c6e9cf2bf
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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: TTP
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description: The following analytic identifies curl being utilized with the -F or
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--form, --upload-file, -T, -d, --data, --data-raw, -I and --head switches to upload
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AWS credentials or config to a remote destination. This enables uploading of binary
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files and so forth. To force the 'content' part to be a file, prefix the file name
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with an @ sign. To just get the content part from a file, prefix the file name with
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the symbol <. The difference between @ and < is then that @ makes a file get attached
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in the post as a file upload, while the < makes a text field and just get the contents
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for that text field from a file. This technique was utlized by the TeamTNT group
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to exfiltrate AWS credentials.
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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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CommandLine:
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- '*-F *'
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- '*--form *'
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- '*--upload-file *'
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- '*-T *'
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- '*-d *'
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- '*--data *'
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- '*--data-raw *'
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- '*-I *'
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- '*--head *'
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Image|endswith: curl
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selection2:
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CommandLine: '*.aws/credentials*'
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condition: selection1 and selection2
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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: Filtering may be required. In addition to AWS credentials,
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add other important files and monitor. The inverse would be to look for _all_ -F
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behavior and tune from there.
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references:
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- https://curl.se/docs/manpage.html
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- https://www.cadosecurity.com/team-tnt-the-first-crypto-mining-worm-to-steal-aws-credentials/
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- https://gtfobins.github.io/gtfobins/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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- Data Exfiltration
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- Ingress Tool Transfer
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: An instance of $process_name$ was identified on endpoint $dest$ by user
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$user$ attempting to upload important files to a remote destination.
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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: 64
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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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