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Unsigned DLL Loaded by a Trusted Process

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Unsigned DLL Loaded by a Trusted Process

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Identifies digitally signed (trusted) processes loading unsigned DLLs. Attackers may plant their payloads into the application folder and invoke the legitimate application to execute the payload, masking actions they perform under a legitimate, trusted, and potentially elevated system or software process.

Rule type: eql

Rule indices:

logs-endpoint.events.library-*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (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: Defense Evasion
Rule Type: BBR
Data Source: Elastic Defend

Version: 102

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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library where host.os.type == "windows" and
   (dll.Ext.relative_file_creation_time <= 500 or
    dll.Ext.relative_file_name_modify_time <= 500 or
    dll.Ext.device.product_id : ("Virtual DVD-ROM", "Virtual Disk")) and dll.hash.sha256 != null and
    process.code_signature.status :"trusted" and not dll.code_signature.status : ("trusted", "errorExpired", "errorCode_endpoint*") and
    /* DLL loaded from the process.executable current directory */
    endswith~(substring(dll.path, 0, length(dll.path) - (length(dll.name) + 1)), substring(process.executable, 0, length(process.executable) - (length(process.name) + 1)))
    and not user.id : "S-1-5-18" and
    not dll.hash.sha256 : (
        "19588e6a318894abe8094374bee233e666f319de909c69f12a6047b14473e299",
        "6e8bee250c8cc1b65150522f33794759f5c65f58fff17c5cbf6422ad68b421d2",
        "55de11531dc0e566cb91f26e48d1301a161a4b8b24abed42304d711412368760",
        "56a5148d00c2d9e58415be2d64eca922a58063fe26d9af1c87084aa383c9058e",
        "83ee0ff920144edb2c2f4ea10130f55443493290886985a63233fa2431e450f9",
        "0d0d8f2eaff6b5f75e63d9721d5a0480b30e70792fe0d3a24d76fd3e61b05982",
        "8b6ce3a640e2d6f36b0001be2a1abb765ae51e62c314a15911e75138cbb544bb",
        "ea02a19dd824cb7d611b8821d1b9e6a076714a195d027d1ff918128a64ac5220",
        "02a6d001e6dd944738e09b720e49dcb1272cb782b870e5ae319d4600bc192225",
        "e7714a1d6ac3f4c4ae22564b9ca301e486f5f42691859c0a687246c47b5cf5c9",
        "17f0f709fb7f6190c03b19b6198fd863b6f0d79f46ccfebac6064be747a4cb3e",
        "cb7ab3788d10940df874acd97b1821bbb5ee4a91f3eec11982bb5bf7a3c96443",
        "c944ee510721a1d30d42227cc3061dfdcbc144c952381afcfe4f6e82c5435ffc",
        "967189adfbc889fde89aafc867f7a1f02731f8592cf6fd5a4ace1929213e2e13",
        "4a824526749790603eb66777f79787128dd282162a3904a4c1135de43b14d029",
        "620a7e658af05cc848091b8a639854b9b15700a9061b4a3d078523653133a4af",
        "cb220267fb0116b298bab6a09a764420d630c52026f7d750f8ffca4818389327",
        "0da1f856d92d6b95f10ed8c3f629cd15468c906de9352fb4ae629139d1412eed",
        "e1646c7778c24407a17881908037a49ecfcb5a980d155212d544302653a3ef62",
        "e102c9c5b22ceb60dc516ab4124bea8ec8e808b08eec48ea7ac674d13fca82ef",
        "c7544e1f9927afdf6e8cd7063020b572e60fe8f00af39227eb831d331df38225",
        "3668c6749db59a6cbc5293d0a4f904f76d6fb5048704449dd53894916f408a57",
        "7705851ba047a8154402aca92621b60be0e0e9d9b52b19bf8be540305bd53dba",
        "b5acf358ff97127eac9ef4c664a980b937376b5295ef23d77ee338225de10d60",
        "394d2d862f2ddce71f28d9b933b21a7d6c621c80ef28652574f758f77f01f716",
        "e958d03db79e9f1d2770c70a5bc24904aa3e2d27a8d5637684cf8166b38908f2",
        "284701380f33a30b25e8eb9822e7f47179238e91d08bd3fb5a117145de7e0d8d",
        "497471497886f18ca16f7facab7d76dc9bfadd69deb9c6e4ea9bdc0869a15628",
        "739bedcfc8eb860927eb2057474be5b39518aaaa6703f9f85307a432fa1f236e",
        "8f4c72e3c7de1ab5d894ec7813f65c5298ecafc183f31924b44a427433ffca42",
        "1ac4753056179b358132c55ca3086d550849ae30259ba94f334826c2fbf6c57e",
        "53e8fecd7d4b1b74064eba9bfa6a361d52929f440954931b4ba65615148bf0ea",
        "e9088afd8871dbad5eda47a9d8abf3b08dd2e17c423ba8a05f9b6ad6751f9b7c",
        "ab27eb05130db2f92499234b69ff97ee6429c7824efcb7324ae3e404e2b405bf",
        "553451008520a5f0110d84192cba40208fb001c27454f946e85e6fb2e6553292"
    )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Hijack Execution Flow
- ID: T1574
- Reference URL: https://attack.mitre.org/techniques/T1574/
Sub-technique:
- Name: DLL Search Order Hijacking
- ID: T1574.001
- Reference URL: https://attack.mitre.org/techniques/T1574/001/
Sub-technique:
- Name: DLL Side-Loading
- ID: T1574.002
- Reference URL: https://attack.mitre.org/techniques/T1574/002/

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