Jonhnathan
112 lines
4.0 KiB
TOML
112 lines
4.0 KiB
TOML
[metadata]
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creation_date = "2021/03/04"
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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 = "2024/10/31"
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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", "Austin Songer"]
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description = """
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Identifies suspicious processes being spawned by the Microsoft Exchange Server Unified Messaging (UM) service. This
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activity has been observed exploiting CVE-2021-26857.
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"""
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false_positives = [
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"""
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Legitimate processes may be spawned from the Microsoft Exchange Server Unified Messaging (UM) service. If known
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processes are causing false positives, they can be exempted from the rule.
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""",
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]
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from = "now-9m"
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index = [
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"logs-endpoint.events.process-*",
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"winlogbeat-*",
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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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name = "Microsoft Exchange Server UM Spawning Suspicious Processes"
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references = [
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"https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers",
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"https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities",
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]
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risk_score = 47
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rule_id = "483c4daf-b0c6-49e0-adf3-0bfa93231d6b"
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severity = "medium"
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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: Initial Access",
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"Tactic: Lateral Movement",
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"Data Source: Elastic Endgame",
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"Use Case: Vulnerability",
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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.parent.name : ("UMService.exe", "UMWorkerProcess.exe") and
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not process.executable : (
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"?:\\Windows\\System32\\werfault.exe",
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"?:\\Windows\\System32\\wermgr.exe",
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"?:\\Program Files\\Microsoft\\Exchange Server\\V??\\Bin\\UMWorkerProcess.exe",
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"?:\\Program Files\\Microsoft\\Exchange Server\\Bin\\UMWorkerProcess.exe",
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"D:\\Exchange 2016\\Bin\\UMWorkerProcess.exe",
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"E:\\ExchangeServer\\Bin\\UMWorkerProcess.exe",
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"D:\\Exchange\\Bin\\UMWorkerProcess.exe",
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"D:\\Exchange Server\\Bin\\UMWorkerProcess.exe",
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"E:\\Exchange Server\\V15\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Windows\\System32\\werfault.exe",
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"\\Device\\HarddiskVolume?\\Windows\\System32\\wermgr.exe",
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"\\Device\\HarddiskVolume?\\Program Files\\Microsoft\\Exchange Server\\V??\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Program Files\\Microsoft\\Exchange Server\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Exchange 2016\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\ExchangeServer\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Exchange\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Exchange Server\\Bin\\UMWorkerProcess.exe",
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"\\Device\\HarddiskVolume?\\Exchange Server\\V15\\Bin\\UMWorkerProcess.exe"
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)
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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 = "T1190"
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name = "Exploit Public-Facing Application"
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reference = "https://attack.mitre.org/techniques/T1190/"
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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 = "T1210"
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name = "Exploitation of Remote Services"
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reference = "https://attack.mitre.org/techniques/T1210/"
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[rule.threat.tactic]
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id = "TA0008"
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name = "Lateral Movement"
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reference = "https://attack.mitre.org/tactics/TA0008/"
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