Jonhnathan
c8ee4c8ce3
* [New Rule] Potential Web Shell ASPX File Creation * Update persistence_web_shell_aspx_write.toml * Update persistence_web_shell_aspx_write.toml
73 lines
2.2 KiB
TOML
73 lines
2.2 KiB
TOML
[metadata]
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creation_date = "2025/07/24"
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integration = ["endpoint", "windows", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
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maturity = "production"
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updated_date = "2025/07/24"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies the creation of ASPX files in specific directories that are commonly targeted by attackers to deploy web shells.
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"""
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from = "now-9m"
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index = [
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"winlogbeat-*",
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"logs-endpoint.events.file-*",
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"logs-windows.sysmon_operational-*",
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"endgame-*",
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"logs-sentinel_one_cloud_funnel.*",
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"logs-m365_defender.event-*",
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"logs-crowdstrike.fdr*",
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]
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language = "eql"
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license = "Elastic License v2"
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name = "Potential Web Shell ASPX File Creation"
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references = [
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"https://blog.viettelcybersecurity.com/toolshell-a-critical-sharepoint-vulnerability-chain-under-active-exploitation/",
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"https://www.sentinelone.com/blog/sharepoint-toolshell-zero-day-exploited-in-the-wild-targets-enterprise-servers/",
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"https://www.rapid7.com/blog/post/2024/10/30/investigating-a-sharepoint-compromise-ir-tales-from-the-field/",
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]
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risk_score = 21
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rule_id = "32144184-7bfa-4541-9c3f-b65f16d24df9"
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severity = "low"
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tags = [
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"Domain: Endpoint",
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"OS: Windows",
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"Use Case: Threat Detection",
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"Tactic: Persistence",
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"Data Source: Elastic Endgame",
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"Data Source: Elastic Defend",
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"Data Source: Sysmon",
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"Data Source: SentinelOne",
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"Data Source: Microsoft Defender for Endpoint",
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"Data Source: Crowdstrike",
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]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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file where host.os.type == "windows" and event.type != "deletion" and
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file.extension : "aspx" and
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file.path : "?:\\Program Files\\Common Files\\Microsoft Shared\\Web Server Extensions\\*" and
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not process.executable: "?:\\Windows\\System32\\msiexec.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 = "T1505"
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name = "Server Software Component"
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reference = "https://attack.mitre.org/techniques/T1505/"
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[[rule.threat.technique.subtechnique]]
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id = "T1505.003"
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name = "Web Shell"
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reference = "https://attack.mitre.org/techniques/T1505/003/"
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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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