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P4T12ICK
78 lines
2.4 KiB
YAML
78 lines
2.4 KiB
YAML
name: Wget Download and Bash Execution
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id: 35682718-5a85-11ec-b8f7-acde48001122
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version: 1
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date: '2021-12-11'
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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 the use of wget on Linux or MacOS attempting
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to download a file from a remote source and pipe it to bash. This is typically found
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with coinminers and most recently with CVE-2021-44228, a vulnerability in Log4j.
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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: wget
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selection2:
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CommandLine: '*-q *'
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selection3:
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CommandLine: '*-O- *'
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selection4:
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CommandLine: '*--quiet*'
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selection5:
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CommandLine: '*bash*'
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selection6:
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CommandLine: '*|*'
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condition: selection1 and selection2 and selection3 and selection4 or selection5
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or selection6
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon for Linux, you will need to ensure mapping is
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occurring correctly. If the EDR is not parsing the pipe bash in the command-line,
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modifying the analytic will be required. Add parent process name (Processes.parent_process_name)
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as needed to filter.
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known_false_positives: False positives should be limited, however filtering may be
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required.
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references:
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- https://www.huntress.com/blog/rapid-response-critical-rce-vulnerability-is-affecting-java
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- https://www.lunasec.io/docs/blog/log4j-zero-day/
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- https://gist.github.com/nathanqthai/01808c569903f41a52e7e7b575caa890
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tags:
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analytic_story:
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- Ingress Tool Transfer
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- Log4Shell CVE-2021-44228
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asset_type: Endpoint
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confidence: 100
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cve:
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- CVE-2021-44228
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impact: 80
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message: An instance of $process_name$ was identified on endpoint $dest$ attempting
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to download a remote file and run it with bash.
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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: 80
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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/linux-sysmon_curlwget.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon_linux
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