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P4T12ICK
84 lines
2.9 KiB
YAML
84 lines
2.9 KiB
YAML
name: Linux Proxy Socks Curl
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id: bd596c22-ad1e-44fc-b242-817253ce8b08
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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 a proxy based
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on command-line arguments - -x, socks, --preproxy and --proxy. This behavior is
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built into the MetaSploit Framework as a auxiliary module. What does socks buy an
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adversary? SOCKS4a extends the SOCKS4 protocol to allow a client to specify a destination
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domain name rather than an IP address. The SOCKS5 protocol is defined in RFC 1928.
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It is an incompatible extension of the SOCKS4 protocol; it offers more choices for
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authentication and adds support for IPv6 and UDP, the latter of which can be used
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for DNS lookups. The protocols, and a proxy itself, allow an adversary to evade
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controls in place monitoring traffic, making it harder for the defender to identify
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and track activity.
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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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- '*-x *'
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- '*socks4a://*'
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- '*socks5h://*'
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- '*socks4://*'
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- '*socks5://*'
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- '*--preproxy *'
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- --proxy*
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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 may be present based on proxy usage internally.
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Filter as needed.
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references:
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- https://www.offensive-security.com/metasploit-unleashed/proxytunnels/
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- https://curl.se/docs/manpage.html
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- https://en.wikipedia.org/wiki/SOCKS
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- https://oxylabs.io/blog/curl-with-proxy
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- https://reqbin.com/req/c-ddxflki5/curl-proxy-server#:~:text=To%20use%20a%20proxy%20with,be%20URL%20decoded%20by%20Curl.
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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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- Ingress Tool Transfer
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asset_type: Endpoint
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confidence: 80
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impact: 70
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message: An instance of $process_name$ was identified on endpoint $dest$ by user
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$user$ utilizing a proxy. Review activity for further details.
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mitre_attack_id:
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- T1090
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- T1095
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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: 56
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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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