Justin Ibarra
97ee8cc9ac
* Refresh beats and ecs schemas and default to use latest to validate * remove incorrect ecs_version from zoom rule * remove stale ecs_version from rules
50 lines
1.5 KiB
TOML
50 lines
1.5 KiB
TOML
[metadata]
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creation_date = "2020/08/18"
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maturity = "production"
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updated_date = "2020/11/03"
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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 = ["winlogbeat-*", "logs-endpoint.events.*"]
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language = "kuery"
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license = "Elastic License"
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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 = ["Elastic", "Host", "Windows", "Threat Detection", "Credential Access"]
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type = "query"
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query = '''
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event.category:process and event.type:(start or process_started) and
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(process.name:aspnet_regiis.exe or process.pe.original_file_name:aspnet_regiis.exe or
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winlog.event_data.OriginalFileName:aspnet_regiis.exe) and
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process.args:(connectionStrings and "-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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