Jonhnathan
4233fef238
* win folder * Other folders * Update test_all_rules.py * . * updated missing elastic defend tags --------- Co-authored-by: terrancedejesus <terrance.dejesus@elastic.co>
111 lines
4.0 KiB
TOML
111 lines
4.0 KiB
TOML
[metadata]
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creation_date = "2023/03/20"
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integration = ["endpoint", "windows"]
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maturity = "production"
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min_stack_comments = "New fields added: required_fields, related_integrations, setup"
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min_stack_version = "8.3.0"
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updated_date = "2023/06/22"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies execution of common Microsoft Office applications to launch an Office Add-In from a suspicious path or
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with an unusual parent process. This may indicate an attempt to get initial access via a malicious phishing
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MS Office Add-In.
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"""
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Suspicious Execution via Microsoft Office Add-Ins"
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references = [
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"https://github.com/Octoberfest7/XLL_Phishing",
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"https://labs.f-secure.com/archive/add-in-opportunities-for-office-persistence/"
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]
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risk_score = 47
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rule_id = "ae8a142c-6a1d-4918-bea7-0b617e99ecfa"
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severity = "medium"
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tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Tactic: Persistence", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
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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
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host.os.type == "windows" and event.type == "start" and
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process.name : ("WINWORD.EXE", "EXCEL.EXE", "POWERPNT.EXE", "MSACCESS.EXE", "VSTOInstaller.exe") and
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process.args regex~ """.+\.(wll|xll|ppa|ppam|xla|xlam|vsto)""" and
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/* Office Add-In from suspicious paths */
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(process.args :
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("?:\\Users\\*\\Temp\\7z*",
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"?:\\Users\\*\\Temp\\Rar$*",
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"?:\\Users\\*\\Temp\\Temp?_*",
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"?:\\Users\\*\\Temp\\BNZ.*",
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"?:\\Users\\*\\Downloads\\*",
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"?:\\Users\\*\\AppData\\Roaming\\*",
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"?:\\Users\\Public\\*",
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"?:\\ProgramData\\*",
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"?:\\Windows\\Temp\\*",
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"\\Device\\*",
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"http*") or
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process.parent.name : ("explorer.exe", "OpenWith.exe") or
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/* Office Add-In from suspicious parent */
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process.parent.name : ("cmd.exe", "powershell.exe")) and
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/* False Positives */
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not (process.args : "*.vsto" and
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process.parent.executable :
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("?:\\Program Files\\Logitech\\LogiOptions\\PlugInInstallerUtility*.exe",
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"?:\\ProgramData\\Logishrd\\LogiOptions\\Plugins\\VSTO\\*\\VSTOInstaller.exe",
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"?:\\Program Files\\Logitech\\LogiOptions\\PlugInInstallerUtility.exe",
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"?:\\Program Files\\LogiOptionsPlus\\PlugInInstallerUtility*.exe",
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"?:\\ProgramData\\Logishrd\\LogiOptionsPlus\\Plugins\\VSTO\\*\\VSTOInstaller.exe",
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"?:\\Program Files\\Common Files\\microsoft shared\\VSTO\\*\\VSTOInstaller.exe")) and
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not (process.args : "/Uninstall" and process.name : "VSTOInstaller.exe") and
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not (process.parent.name : "rundll32.exe" and
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process.parent.args : "?:\\WINDOWS\\Installer\\MSI*.tmp,zzzzInvokeManagedCustomActionOutOfProc") and
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not (process.name : "VSTOInstaller.exe" and process.args : "https://dl.getsidekick.com/outlook/vsto/Sidekick.vsto")
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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 = "T1566"
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name = "Phishing"
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reference = "https://attack.mitre.org/techniques/T1566/"
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[[rule.threat.technique.subtechnique]]
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id = "T1566.001"
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name = "Spearphishing Attachment"
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reference = "https://attack.mitre.org/techniques/T1566/001/"
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[rule.threat.tactic]
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id = "TA0001"
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name = "Initial Access"
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reference = "https://attack.mitre.org/tactics/TA0001/"
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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 = "T1137"
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name = "Office Application Startup"
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reference = "https://attack.mitre.org/techniques/T1137/"
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[[rule.threat.technique.subtechnique]]
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id = "T1137.006"
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name = "Add-ins"
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reference = "https://attack.mitre.org/techniques/T1137/006/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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