Jonhnathan
a743b9c8c4
* [Rule Tuning] 3rd Party EDR - Add Crowdstrike FDR support - 6 * Update credential_access_cmdline_dump_tool.toml * Update defense_evasion_powershell_windows_firewall_disabled.toml * Revert "Update defense_evasion_powershell_windows_firewall_disabled.toml" This reverts commit d2df2a848290425ebfe0bb5157332ad0611f726f. * Update lateral_movement_via_wsus_update.toml --------- Co-authored-by: shashank-elastic <91139415+shashank-elastic@users.noreply.github.com>
75 lines
2.3 KiB
TOML
75 lines
2.3 KiB
TOML
[metadata]
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creation_date = "2020/08/18"
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integration = ["endpoint", "windows", "system", "m365_defender", "sentinel_one_cloud_funnel", "crowdstrike"]
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maturity = "production"
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updated_date = "2024/11/02"
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min_stack_version = "8.14.0"
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min_stack_comments = "Breaking change at 8.14.0 for the Windows Integration."
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[rule]
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author = ["Elastic"]
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description = """
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Identifies use of aspnet_regiis to decrypt Microsoft IIS connection strings. An attacker with Microsoft IIS web server
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access via a webshell or alike can decrypt and dump any hardcoded connection strings, such as the MSSQL service account
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password using aspnet_regiis command.
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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.process-*",
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"logs-windows.forwarded*",
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"logs-windows.sysmon_operational-*",
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"endgame-*",
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"logs-system.security*",
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"logs-m365_defender.event-*",
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"logs-sentinel_one_cloud_funnel.*",
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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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max_signals = 33
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name = "Microsoft IIS Connection Strings Decryption"
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references = [
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"https://blog.netspi.com/decrypting-iis-passwords-to-break-out-of-the-dmz-part-1/",
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"https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/greenbug-espionage-telco-south-asia",
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]
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risk_score = 73
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rule_id = "c25e9c87-95e1-4368-bfab-9fd34cf867ec"
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severity = "high"
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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: Credential Access",
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"Data Source: Elastic Endgame",
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"Data Source: Elastic Defend",
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"Data Source: System",
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"Data Source: Microsoft Defender for Endpoint",
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"Data Source: Sysmon",
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"Data Source: SentinelOne",
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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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process where host.os.type == "windows" and event.type == "start" and
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(process.name : "aspnet_regiis.exe" or ?process.pe.original_file_name == "aspnet_regiis.exe") and
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process.args : "connectionStrings" and process.args : "-pdf"
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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 = "T1003"
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name = "OS Credential Dumping"
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reference = "https://attack.mitre.org/techniques/T1003/"
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[rule.threat.tactic]
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id = "TA0006"
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name = "Credential Access"
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reference = "https://attack.mitre.org/tactics/TA0006/"
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