[New Rule] Suspicious PowerShell Engine ImageLoad (#559)

* [New Rule] Suspicious PowerShell Engine ImageLoad * Update rules/windows/defense_evasion_suspicious_powershell_imgload.toml Co-authored-by: dstepanic17 <57736958+dstepanic17@users.noreply.github.com> * eql syntax * ecs_version * Update rules/windows/defense_evasion_suspicious_powershell_imgload.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Update rules/windows/defense_evasion_suspicious_powershell_imgload.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: dstepanic17 <57736958+dstepanic17@users.noreply.github.com> Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
2020-12-04 16:48:01 +01:00
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commit c7d7bd7fdd
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+[metadata]
+creation_date = "2020/11/17"
+maturity = "production"
+updated_date = "2020/11/17"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the PowerShell engine being invoked by unexpected processes. Rather than executing PowerShell functionality
+with powershell.exe, some attackers do this to operate more stealthily.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*", "winlogbeat-*"]
+language = "eql"
+license = "Elastic License"
+name = "Suspicious PowerShell Engine ImageLoad"
+risk_score = 47
+rule_id = "852c1f19-68e8-43a6-9dce-340771fe1be3"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
+type = "eql"
+
+query = '''
+library where file.name : ("System.Management.Automation.ni.dll", "System.Management.Automation.dll") and
+/* add false positives relevant to your environment here */
+not process.executable : ("C:\\Windows\\System32\\RemoteFXvGPUDisablement.exe", "C:\\Windows\\System32\\sdiagnhost.exe", "C:\\Program Files*\\*.exe") and
+  not process.name : (
+  "Altaro.SubAgent.exe",
+  "AppV_Manage.exe",
+  "azureadconnect.exe",
+  "CcmExec.exe",
+  "configsyncrun.exe",
+  "choco.exe",
+  "ctxappvservice.exe",
+  "DVLS.Console.exe",
+  "edgetransport.exe",
+  "exsetup.exe",
+  "forefrontactivedirectoryconnector.exe",
+  "InstallUtil.exe",
+  "JenkinsOnDesktop.exe",
+  "Microsoft.EnterpriseManagement.ServiceManager.UI.Console.exe",
+  "mmc.exe",
+  "mscorsvw.exe",
+  "msexchangedelivery.exe",
+  "msexchangefrontendtransport.exe",
+  "msexchangehmworker.exe",
+  "msexchangesubmission.exe",
+  "msiexec.exe",
+  "MsiExec.exe",
+  "noderunner.exe",
+  "NServiceBus.Host.exe",
+  "NServiceBus.Host32.exe",
+  "NServiceBus.Hosting.Azure.HostProcess.exe",
+  "OuiGui.WPF.exe",
+  "powershell.exe",
+  "powershell_ise.exe",
+  "pwsh.exe",
+  "SCCMCliCtrWPF.exe",
+  "ScriptEditor.exe",
+  "ScriptRunner.exe",
+  "sdiagnhost.exe",
+  "servermanager.exe",
+  "setup100.exe",
+  "ServiceHub.VSDetouredHost.exe",
+  "SPCAF.Client.exe",
+  "SPCAF.SettingsEditor.exe",
+  "SQLPS.exe",
+  "telemetryservice.exe",
+  "UMWorkerProcess.exe",
+  "w3wp.exe",
+  "wsmprovhost.exe"
+ )
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1086"
+name = "PowerShell"
+reference = "https://attack.mitre.org/techniques/T1086/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"