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Patrick
83 lines
3.7 KiB
YAML
83 lines
3.7 KiB
YAML
name: Windows Command Shell Fetch Env Variables
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id: 048839e4-1eaa-43ff-8a22-86d17f6fcc13
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version: 2
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date: '2024-05-28'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic identifies a suspicious process command line fetching
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environment variables with a non-shell parent process. It leverages data from Endpoint
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Detection and Response (EDR) agents, focusing on command-line executions and parent
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process names. This activity is significant as it is commonly associated with malware
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like Qakbot, which uses this technique to gather system information. If confirmed
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malicious, this behavior could indicate that the parent process has been compromised,
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potentially allowing attackers to execute arbitrary commands, escalate privileges,
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or persist within the environment.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process = "*cmd /c
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set" OR Processes.process = "*cmd.exe /c set" AND NOT (Processes.parent_process_name
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= "cmd.exe" OR Processes.parent_process_name = "powershell*" OR Processes.parent_process_name="pwsh.exe"
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OR Processes.parent_process_name = "explorer.exe") by Processes.dest Processes.user
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Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id Processes.original_file_name | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_command_shell_fetch_env_variables_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: shell process that are not included in this search may cause
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False positive. Filter is needed.
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references:
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- https://twitter.com/pr0xylife/status/1585612370441031680?s=46&t=Dc3CJi4AnM-8rNoacLbScg
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tags:
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analytic_story:
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- Qakbot
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asset_type: Endpoint
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confidence: 70
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impact: 80
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message: non-shell parent process has a child process $process_name$ with a commandline
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$process$ to fetch env variables in $dest$
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mitre_attack_id:
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- T1055
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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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.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/qakbot/qbot_wermgr/sysmon_wermgr.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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