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tccontre
70 lines
2.4 KiB
YAML
70 lines
2.4 KiB
YAML
name: CHCP Command Execution
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id: 21d236ec-eec1-11eb-b23e-acde48001122
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version: 1
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date: '2021-07-27'
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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: This search is to detect execution of chcp.exe application. this utility
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is used to change the active code page of the console. This technique was seen in
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icedid malware to know the locale region/language/country of the compromise host.
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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_name=chcp.com
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Processes.parent_process_name = cmd.exe Processes.parent_process=*/c* by Processes.process_name
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Processes.process Processes.parent_process_name Processes.parent_process Processes.process_id
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Processes.parent_process_id Processes.dest Processes.user | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `chcp_command_execution_filter`'
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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, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances where renamed chcp.com may be used.
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known_false_positives: other tools or script may used this to change code page to
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UTF-* or others
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references:
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- https://ss64.com/nt/chcp.html
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- https://twitter.com/tccontre18/status/1419941156633329665?s=20
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tags:
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analytic_story:
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- IcedID
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- Azorult
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confidence: 30
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context:
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- Source:Endpoint
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- Stage:Recon
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/icedid/simulated_icedid/windows-sysmon.log
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impact: 30
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kill_chain_phases:
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- Reconnaissance
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message: parent process $parent_process_name$ spawning chcp process $process_name$
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with parent command line $parent_process$
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mitre_attack_id:
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- T1059
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observable:
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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: user
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type: User
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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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- process_name
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- process
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- parent_process_name
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- parent_process
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- process_id
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- parent_process_id
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- dest
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- user
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risk_score: 9
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security_domain: endpoint
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asset_type: Endpoint
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