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P4T12ICK
88 lines
3.3 KiB
YAML
88 lines
3.3 KiB
YAML
name: Detect mshta inline hta execution
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id: a0873b32-5b68-11eb-ae93-0242ac130002
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version: 6
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date: '2021-09-16'
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author: Bhavin Patel, Michael Haag, Splunk
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status: production
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type: TTP
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description: The following analytic identifies "mshta.exe" execution with inline protocol
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handlers. "JavaScript", "VBScript", and "About" are the only supported options when
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invoking HTA content directly on the command-line. The search will return the first
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time and last time these command-line arguments were used for these executions,
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as well as the target system, the user, process "mshta.exe" and its parent process.
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data_source:
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- Sysmon Event ID 1
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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 `process_mshta` (Processes.process=*vbscript*
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OR Processes.process=*javascript* OR Processes.process=*about*) by Processes.user
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Processes.process_name Processes.original_file_name Processes.parent_process_name
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Processes.dest | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`|
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`security_content_ctime(lastTime)` | `detect_mshta_inline_hta_execution_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: 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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- https://docs.microsoft.com/en-us/windows/win32/search/-search-3x-wds-extidx-prot-implementing
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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: 100
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impact: 90
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ executing with inline HTA, indicative of defense
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evasion.
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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: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child 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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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: 90
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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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