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tccontre
76 lines
3.1 KiB
YAML
76 lines
3.1 KiB
YAML
name: Windows Command Shell Fetch Env Variables
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id: 048839e4-1eaa-43ff-8a22-86d17f6fcc13
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version: 1
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date: '2022-10-27'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies a suspicious process command line fetching the environment variables with a non-shell parent process.
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This technique was seen in qakbot malware where it fetches the environment variable in the target or compromised host. This TTP detection is a good pivot
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of possible malicious behavior since the command line is executed by a common non-shell process like cmd.exe , powershell.exe and many more.
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This can also be a good sign that the parent process has a malicious code injected to it to execute this command.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.process = "*cmd /c set" OR Processes.process = "*cmd.exe /c set" AND NOT (Processes.parent_process_name = "cmd.exe"
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OR Processes.parent_process_name = "powershell*" OR Processes.parent_process_name="pwsh.exe" OR Processes.parent_process_name = "explorer.exe")
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by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id Processes.original_file_name
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `windows_command_shell_fetch_env_variables_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. 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: shell process that are not included in this search may cause 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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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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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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impact: 80
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kill_chain_phases:
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- Exploitation
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message: non-shell parent process has a child process $process_name$ with a commandline $process$ to fetch env variables in $dest$
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mitre_attack_id:
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- T1055
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nist:
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- DE.CM
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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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