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mhaag-spl
46 lines
2.2 KiB
YAML
46 lines
2.2 KiB
YAML
name: Detect mshta inline hta execution
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id: a0873b32-5b68-11eb-ae93-0242ac130002
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version: 5
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date: '2021-01-20'
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description: The following analytic identifies "mshta.exe" execution with inline
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protocol handlers. "JavaScript", "VBScript", and "About" are the only supported
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options when invoking HTA content directly on the command-line. The search will
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return the first time and last time these command-line arguments were used for
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these executions, as well as the target system, the user, process "mshta.exe"
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and its parent process.
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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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type: ESCU
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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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- https://docs.microsoft.com/en-us/windows/win32/search/-search-3x-wds-extidx-prot-implementing
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author: Bhavin Patel, Michael Haag, Splunk
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search: '| tstats `security_content_summariesonly` count values(Processes.process)
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as process values(Processes.parent_process) as parent_process min(_time) as firstTime
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max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=mshta.exe
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(Processes.process=*vbscript* OR Processes.process=*javascript* OR Processes.process=*about*) by Processes.user
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Processes.process_name Processes.parent_process_name Processes.dest | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`
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| `detect_mshta_inline_hta_execution_filter`'
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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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tags:
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analytics_story:
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- Suspicious MSHTA Activity
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mitre_attack_id:
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- T1218.005
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kill_chain_phases:
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- Exploitation
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cis20:
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- CIS 8
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nist:
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- PR.PT
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- DE.CM
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security_domain: endpoint
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asset_type: Endpoint
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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/T1218.005/atomic_red_team/windows-sysmon.log
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