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53 lines
2.4 KiB
YAML
53 lines
2.4 KiB
YAML
name: W3WP Spawning Shell
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id: 0f03423c-7c6a-11eb-bc47-acde48001122
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version: 1
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date: '2021-03-03'
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author: Michael Haag, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This query identifies a shell, PowerShell.exe or Cmd.exe, spawning from
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W3WP.exe, or IIS. In addition to IIS logs, this behavior with an EDR product will
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capture potential webshell activity, similar to the HAFNIUM Group abusing CVEs,
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on publicly available Exchange mail servers. During triage, review the parent process
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and child process of the shell being spawned. Review the command-line arguments
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and any file modifications that may occur. Identify additional parallel process,
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child processes, that may highlight further commands executed. After triaging, work
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to contain the threat and patch the system that is vulnerable.
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search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
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as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=w3wp.exe
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AND Processes.process_name=cmd.exe OR Processes.process_name=powershell.exe by Processes.dest
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Processes.parent_process Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`| `w3wp_spawning_shell_filter`'
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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.
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known_false_positives: Baseline your environment before production. It is possible
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build systems using IIS will spawn cmd.exe to perform a software build. Filter as
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needed.
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references:
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- https://www.microsoft.com/security/blog/2020/02/04/ghost-in-the-shell-investigating-web-shell-attacks/
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tags:
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analytic_story:
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- HAFNIUM Group
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1505.003/windows-sysmon.log
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1505.003
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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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required_fields:
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- _time
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- Processes.process_name
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- Processes.process
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- Processes.dest
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- Processes.user
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- Processes.parent_process
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security_domain: endpoint
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