Austin Songer
ef7548f04c
* Update collection_email_powershell_exchange_mailbox.toml * Update command_and_control_remote_file_copy_powershell.toml * Update defense_evasion_disabling_windows_defender_powershell.toml * Update execution_scheduled_task_powershell_source.toml * Update execution_via_compiled_html_file.toml * Update impact_volume_shadow_copy_deletion_via_powershell.toml * Update initial_access_suspicious_ms_exchange_worker_child_process.toml * Update persistence_powershell_exch_mailbox_activesync_add_device.toml * Update persistence_webshell_detection.toml * Update defense_evasion_execution_msbuild_started_by_script.toml * Update defense_evasion_clearing_windows_event_logs.toml * Update defense_evasion_suspicious_zoom_child_process.toml * Update defense_evasion_defender_exclusion_via_powershell.toml * Update persistence_local_scheduled_task_scripting.toml * Update persistence_local_scheduled_task_creation.toml * Update persistence_system_shells_via_services.toml * Update collection_email_powershell_exchange_mailbox.toml * Update command_and_control_remote_file_copy_powershell.toml * Update defense_evasion_clearing_windows_event_logs.toml * Update defense_evasion_defender_exclusion_via_powershell.toml * Update defense_evasion_disabling_windows_defender_powershell.toml * Update defense_evasion_execution_msbuild_started_by_script.toml * Update defense_evasion_suspicious_zoom_child_process.toml * Update execution_scheduled_task_powershell_source.toml * Update execution_via_compiled_html_file.toml * Update impact_volume_shadow_copy_deletion_via_powershell.toml * Update initial_access_suspicious_ms_exchange_worker_child_process.toml * Update persistence_local_scheduled_task_creation.toml * Update persistence_local_scheduled_task_scripting.toml * Update persistence_powershell_exch_mailbox_activesync_add_device.toml * Update persistence_system_shells_via_services.toml * Update persistence_webshell_detection.toml * Update rules/windows/persistence_local_scheduled_task_creation.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/initial_access_suspicious_ms_exchange_worker_child_process.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/defense_evasion_disabling_windows_defender_powershell.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/defense_evasion_defender_exclusion_via_powershell.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Jonhnathan <jonhnathancesar@gmail.com>
76 lines
2.2 KiB
TOML
76 lines
2.2 KiB
TOML
[metadata]
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creation_date = "2020/02/18"
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maturity = "production"
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updated_date = "2021/10/17"
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[rule]
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author = ["Elastic"]
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description = """
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Compiled HTML files (.chm) are commonly distributed as part of the Microsoft HTML Help system. Adversaries may conceal
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malicious code in a CHM file and deliver it to a victim for execution. CHM content is loaded by the HTML Help executable
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program (hh.exe).
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"""
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false_positives = [
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"""
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The HTML Help executable program (hh.exe) runs whenever a user clicks a compiled help (.chm) file or menu item that
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opens the help file inside the Help Viewer. This is not always malicious, but adversaries may abuse this technology
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to conceal malicious code.
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""",
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]
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Process Activity via Compiled HTML File"
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risk_score = 47
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rule_id = "e3343ab9-4245-4715-b344-e11c56b0a47f"
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severity = "medium"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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process where event.type in ("start", "process_started") and
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process.parent.name : "hh.exe" and
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process.name : ("mshta.exe", "cmd.exe", "powershell.exe", "pwsh.exe", "powershell_ise.exe", "cscript.exe", "wscript.exe")
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1204"
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name = "User Execution"
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reference = "https://attack.mitre.org/techniques/T1204/"
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[[rule.threat.technique.subtechnique]]
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id = "T1204.002"
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name = "Malicious File"
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reference = "https://attack.mitre.org/techniques/T1204/002/"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1218"
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name = "Signed Binary Proxy Execution"
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reference = "https://attack.mitre.org/techniques/T1218/"
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[[rule.threat.technique.subtechnique]]
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id = "T1218.001"
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name = "Compiled HTML File"
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reference = "https://attack.mitre.org/techniques/T1218/001/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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