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Potential Credential Access via Memory Dump File Creation

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Potential Credential Access via Memory Dump File Creation

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Identifies the creation or modification of a medium size memory dump file which can indicate an attempt to access credentials from a process memory.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Credential Access
Data Source: Elastic Defend
Rule Type: BBR

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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file where host.os.type == "windows" and event.type == "creation" and

  /* MDMP header */
  file.Ext.header_bytes : "4d444d50*" and file.size >= 30000 and
  not

  (
    (
      process.executable : (
        "?:\\Windows\\System32\\WerFault.exe",
        "?:\\Windows\\SysWOW64\\WerFault.exe",
        "?:\\Windows\\System32\\Wermgr.exe",
        "?:\\Windows\\SysWOW64\\Wermgr.exe",
        "?:\\Windows\\System32\\WerFaultSecure.exe",
        "?:\\Windows\\System32\\WUDFHost.exe",
        "?:\\Windows\\System32\\Taskmgr.exe",
        "?:\\Windows\\SysWOW64\\Taskmgr.exe",
        "?:\\Program Files\\*.exe",
        "?:\\Program Files (x86)\\*.exe",
        "?:\\Windows\\SystemApps\\*.exe",
        "?:\\Users\\*\\AppData\\Roaming\\Zoom\\bin\\zCrashReport64.exe"
      ) and process.code_signature.trusted == true
    ) or
    (
      file.path : (
        "?:\\ProgramData\\Microsoft\\Windows\\WER\\*",
        "?:\\ProgramData\\Microsoft\\WDF\\*",
        "?:\\ProgramData\\Alteryx\\ErrorLogs\\*",
        "?:\\ProgramData\\Goodix\\*",
        "?:\\Windows\\system32\\config\\systemprofile\\AppData\\Local\\CrashDumps\\*",
        "?:\\Users\\*\\AppData\\Roaming\\Zoom\\logs\\zoomcrash*",
        "?:\\Users\\*\\AppData\\*\\Crashpad\\*",
        "?:\\Users\\*\\AppData\\*\\crashpaddb\\*",
        "?:\\Users\\*\\AppData\\*\\HungReports\\*",
        "?:\\Users\\*\\AppData\\*\\CrashDumps\\*",
        "?:\\Users\\*\\AppData\\*\\NativeCrashReporting\\*"
      ) and (process.code_signature.trusted == true or process.executable == null)
    )
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/
Sub-technique:
- Name: LSASS Memory
- ID: T1003.001
- Reference URL: https://attack.mitre.org/techniques/T1003/001/

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