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josehelps
79 lines
3.1 KiB
YAML
79 lines
3.1 KiB
YAML
name: Windows Rename System Utilities Appinstaller exe LOLBAS in Non Standard Path
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id: 057c06c7-ef31-4749-b5c9-199152e53a06
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version: 1
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date: '2022-10-18'
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author: Splunk Threat Research Bot, Splunk
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type: Anomaly
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datamodel:
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- Endpoint_Processes
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description: The following analytic identifies AppInstaller.exe which is a native
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living off the land binary or script (LOLBAS) within the Windows operating system
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that may be abused by adversaries by moving it to a new directory. The list of binaries
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was derived from the https://lolbas-project.github.io site.
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search: '| from read_ssa_enriched_events() | eval device=ucast(map_get(input_event,
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"dest_device_id"), "string", null), user=ucast(map_get(input_event, "dest_user_id"),
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"string", null), timestamp=parse_long(ucast(map_get(input_event, "_time"), "string",
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null)), process_name=lower(ucast(map_get(input_event, "process_name"), "string",
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null)), process_path=lower(ucast(map_get(input_event, "process_path"), "string",
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null)), event_id=ucast(map_get(input_event, "event_id"), "string", null)| where
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process_name IS NOT NULL AND process_name="appinstaller.exe"| where process_path
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IS NOT NULL AND match_regex(process_path, /(?i)\\program files\\windowsapps\\microsoft.desktopappinstaller_1.11.2521.0_x64__8wekyb3d8bbwe/)=false
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| eval start_time=timestamp,end_time=timestamp, entities=mvappend(device, user),
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body=create_map(["event_id", event_id, "process_path", process_path, "process_name",
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process_name]) | into write_ssa_detected_events();'
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how_to_implement: To successfully implement this search, you must be ingesting logs
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with the process name, command-line arguments, and parent processes from your endpoints.
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Collect endpoint data such as Sysmon or Windows Events 4688.
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known_false_positives: False positives may be present and filtering may be required.
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Certain utilities will run from non-standard paths based on the third-party application
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in use.
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1036.003/T1036.003.yaml
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- https://attack.mitre.org/techniques/T1036/003/
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- https://lolbas-project.github.io/
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tags:
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analytic_story:
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- Unusual Processes
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- Living Off The Land
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cis20:
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- CIS 8
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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/attack_techniques/T1036/system_process_running_unexpected_location/dotnet_lolbin-windows-security.log
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impact: 20
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kill_chain_phases:
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- Actions on Objectives
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message: A system process $process_name$ with path $process_path$ spawn in non-default
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folder path on host $dest_device_id$
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mitre_attack_id:
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- T1036
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- T1036.003
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nist:
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- PR.PT
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- DE.CM
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observable:
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- name: dest_device_id
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type: Hostname
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role:
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- Victim
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- name: dest_user_id
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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 Behavioral Analytics
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required_fields:
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- dest_device_id
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- process_name
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- _time
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- dest_user_id
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- process_path
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risk_score: 14
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risk_severity: low
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security_domain: endpoint
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asset_type: Endpoint
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file_path: ba_detection_template.yml
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