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Elastic Docs ›Elastic Security Solution [8.11] ›Downloadable rule update v8.11.12

Suspicious Module Loaded by LSASS

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Suspicious Module Loaded by LSASS

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Identifies LSASS loading an unsigned or untrusted DLL. Windows Security Support Provider (SSP) DLLs are loaded into LSSAS process at system start. Once loaded into the LSA, SSP DLLs have access to encrypted and plaintext passwords that are stored in Windows, such as any logged-on user’s Domain password or smart card PINs.

Rule type: eql

Rule indices:

  • logs-endpoint.events.library-*

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

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

Version: 8

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setup

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Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule query

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library where host.os.type == "windows" and process.executable : "?:\\Windows\\System32\\lsass.exe" and
  not (dll.code_signature.subject_name :
               ("Microsoft Windows",
                "Microsoft Corporation",
                "Microsoft Windows Publisher",
                "Microsoft Windows Software Compatibility Publisher",
                "Microsoft Windows Hardware Compatibility Publisher",
                "McAfee, Inc.",
                "SecMaker AB",
                "HID Global Corporation",
                "HID Global",
                "Apple Inc.",
                "Citrix Systems, Inc.",
                "Dell Inc",
                "Hewlett-Packard Company",
                "Symantec Corporation",
                "National Instruments Corporation",
                "DigitalPersona, Inc.",
                "Novell, Inc.",
                "gemalto",
                "EasyAntiCheat Oy",
                "Entrust Datacard Corporation",
                "AuriStor, Inc.",
                "LogMeIn, Inc.",
                "VMware, Inc.",
                "Istituto Poligrafico e Zecca dello Stato S.p.A.",
                "Nubeva Technologies Ltd",
                "Micro Focus (US), Inc.",
                "Yubico AB",
                "GEMALTO SA",
                "Secure Endpoints, Inc.",
                "Sophos Ltd",
                "Morphisec Information Security 2014 Ltd",
                "Entrust, Inc.",
                "Nubeva Technologies Ltd",
                "Micro Focus (US), Inc.",
                "F5 Networks Inc",
                "Bit4id",
                "Thales DIS CPL USA, Inc.",
                "Micro Focus International plc",
                "HYPR Corp",
                "Intel(R) Software Development Products",
                "PGP Corporation",
                "Parallels International GmbH",
                "FrontRange Solutions Deutschland GmbH",
                "SecureLink, Inc.",
                "Tidexa OU",
                "Amazon Web Services, Inc.",
                "SentryBay Limited",
                "Audinate Pty Ltd",
                "CyberArk Software Ltd.",
                "McAfeeSysPrep",
                "NVIDIA Corporation PE Sign v2016",
                "Trend Micro, Inc.",
                "Fortinet Technologies (Canada) Inc.",
                "Carbon Black, Inc.") and
       dll.code_signature.status : ("trusted", "errorExpired", "errorCode_endpoint*", "errorChaining")) and

     not dll.hash.sha256 :
                ("811a03a5d7c03802676d2613d741be690b3461022ea925eb6b2651a5be740a4c",
                 "1181542d9cfd63fb00c76242567446513e6773ea37db6211545629ba2ecf26a1",
                 "ed6e735aa6233ed262f50f67585949712f1622751035db256811b4088c214ce3",
                 "26be2e4383728eebe191c0ab19706188f0e9592add2e0bf86b37442083ae5e12",
                 "9367e78b84ef30cf38ab27776605f2645e52e3f6e93369c674972b668a444faa",
                 "d46cc934765c5ecd53867070f540e8d6f7701e834831c51c2b0552aba871921b",
                 "0f77a3826d7a5cd0533990be0269d951a88a5c277bc47cff94553330b715ec61",
                 "4aca034d3d85a9e9127b5d7a10882c2ef4c3e0daa3329ae2ac1d0797398695fb",
                 "86031e69914d9d33c34c2f4ac4ae523cef855254d411f88ac26684265c981d95")

Framework: MITRE ATT&CKTM

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