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Process Execution from an Unusual Directory

Elastic Stack Serverless Security

Identifies process execution from suspicious default Windows directories. This is sometimes done by adversaries to hide malware in trusted paths.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*
  • logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Defense Evasion

Version: 6

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

Rule query

process where event.type in ("start", "process_started", "info") and
 /* add suspicious execution paths here */
process.executable : ("C:\\PerfLogs\\*.exe","C:\\Users\\Public\\*.exe","C:\\Windows\\Tasks\\*.exe","C:\\Intel\\*.exe","C:\\AMD\\Temp\\*.exe","C:\\Windows\\AppReadiness\\*.exe",
"C:\\Windows\\ServiceState\\*.exe","C:\\Windows\\security\\*.exe","C:\\Windows\\IdentityCRL\\*.exe","C:\\Windows\\Branding\\*.exe","C:\\Windows\\csc\\*.exe",
 "C:\\Windows\\DigitalLocker\\*.exe","C:\\Windows\\en-US\\*.exe","C:\\Windows\\wlansvc\\*.exe","C:\\Windows\\Prefetch\\*.exe","C:\\Windows\\Fonts\\*.exe",
 "C:\\Windows\\diagnostics\\*.exe","C:\\Windows\\TAPI\\*.exe","C:\\Windows\\INF\\*.exe","C:\\Windows\\System32\\Speech\\*.exe","C:\\windows\\tracing\\*.exe",
 "c:\\windows\\IME\\*.exe","c:\\Windows\\Performance\\*.exe","c:\\windows\\intel\\*.exe","c:\\windows\\ms\\*.exe","C:\\Windows\\dot3svc\\*.exe",
 "C:\\Windows\\panther\\*.exe","C:\\Windows\\RemotePackages\\*.exe","C:\\Windows\\OCR\\*.exe","C:\\Windows\\appcompat\\*.exe","C:\\Windows\\apppatch\\*.exe","C:\\Windows\\addins\\*.exe",
 "C:\\Windows\\Setup\\*.exe","C:\\Windows\\Help\\*.exe","C:\\Windows\\SKB\\*.exe","C:\\Windows\\Vss\\*.exe","C:\\Windows\\Web\\*.exe","C:\\Windows\\servicing\\*.exe","C:\\Windows\\CbsTemp\\*.exe",
 "C:\\Windows\\Logs\\*.exe","C:\\Windows\\WaaS\\*.exe","C:\\Windows\\ShellExperiences\\*.exe","C:\\Windows\\ShellComponents\\*.exe","C:\\Windows\\PLA\\*.exe",
 "C:\\Windows\\Migration\\*.exe","C:\\Windows\\debug\\*.exe","C:\\Windows\\Cursors\\*.exe","C:\\Windows\\Containers\\*.exe","C:\\Windows\\Boot\\*.exe","C:\\Windows\\bcastdvr\\*.exe",
 "C:\\Windows\\assembly\\*.exe","C:\\Windows\\TextInput\\*.exe","C:\\Windows\\security\\*.exe","C:\\Windows\\schemas\\*.exe","C:\\Windows\\SchCache\\*.exe","C:\\Windows\\Resources\\*.exe",
 "C:\\Windows\\rescache\\*.exe","C:\\Windows\\Provisioning\\*.exe","C:\\Windows\\PrintDialog\\*.exe","C:\\Windows\\PolicyDefinitions\\*.exe","C:\\Windows\\media\\*.exe",
 "C:\\Windows\\Globalization\\*.exe","C:\\Windows\\L2Schemas\\*.exe","C:\\Windows\\LiveKernelReports\\*.exe","C:\\Windows\\ModemLogs\\*.exe","C:\\Windows\\ImmersiveControlPanel\\*.exe") and
 not process.name : ("SpeechUXWiz.exe","SystemSettings.exe","TrustedInstaller.exe","PrintDialog.exe","MpSigStub.exe","LMS.exe","mpam-*.exe") and
 not process.executable :
           ("?:\\Intel\\Wireless\\WUSetupLauncher.exe",
            "?:\\Intel\\Wireless\\Setup.exe",
            "?:\\Intel\\Move Mouse.exe",
            "?:\\windows\\Panther\\DiagTrackRunner.exe",
            "?:\\Windows\\servicing\\GC64\\tzupd.exe",
            "?:\\Users\\Public\\res\\RemoteLite.exe",
            "?:\\Users\\Public\\IBM\\ClientSolutions\\*.exe",
            "?:\\Users\\Public\\Documents\\syspin.exe",
            "?:\\Users\\Public\\res\\FileWatcher.exe")
 /* uncomment once in winlogbeat */
 /* and not (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) */

Framework: MITRE ATT&CKTM