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P4T12ICK
75 lines
2.2 KiB
YAML
75 lines
2.2 KiB
YAML
name: Suspicious mshta child process
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id: 60023bb6-5500-11eb-ae93-0242ac130002
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version: 1
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date: '2021-01-12'
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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 child processes spawning from "mshta.exe".
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The search will return the first time and last time these command-line arguments
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were used for these executions, as well as the target system, the user, parent process
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"mshta.exe" and its child process.
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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:
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- cmd.exe
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- powershell.exe
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- wscript.exe
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- cscript.exe
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- scrcons.exe
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- searchprotocolhost.exe
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- microsoft.workflow.compiler.exe
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- msbuild.exe
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- colorcpl.exe
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- powershell.exe
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ParentImage: mshta.exe
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condition: (selection1)
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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.
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known_false_positives: Although unlikely, some legitimate applications may exhibit
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this behavior, triggering a false positive.
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references:
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- https://github.com/redcanaryco/AtomicTestHarnesses
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- https://redcanary.com/blog/introducing-atomictestharnesses/
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tags:
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analytic_story:
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- Suspicious MSHTA Activity
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- Living Off The Land
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asset_type: Endpoint
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confidence: 80
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impact: 50
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message: suspicious mshta child process detected on host $dest$ by user $user$.
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mitre_attack_id:
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- T1218
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- T1218.005
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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: Endpoint
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role:
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- Victim
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- name: parent_process
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type: Process Name
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role:
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- Parent 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: 40
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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/T1218.005/atomic_red_team/windows-sysmon.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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