What is winfsp-x64.dll?

winfsp-x64.dll is part of WinFsp and developed by Navimatics Corporation according to the winfsp-x64.dll version information.

winfsp-x64.dll's description is "Windows File System Proxy"

winfsp-x64.dll is digitally signed by LLC Mail.Ru.

winfsp-x64.dll is usually located in the 'C:\Windows\system32\disko\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about winfsp-x64.dll.

If you have additional information about the file, please share it with the FreeFixer users by posting a comment at the bottom of this page.

Vendor and version information [?]

The following is the available information on winfsp-x64.dll:

PropertyValue
Product nameWinFsp
Company nameNavimatics Corporation
File descriptionWindows File System Proxy
Internal namewinfsp.dll
Original filenamewinfsp.dll
Legal copyright2015-2019 Bill Zissimopoulos
Product version2019.1
File version1.4.19016.0eb84d6

Here's a screenshot of the file properties when displayed by Windows Explorer:

Product nameWinFsp
Company nameNavimatics Corporation
File descriptionWindows File System Proxy
Internal namewinfsp.dll
Original filenamewinfsp.dll
Legal copyright2015-2019 Bill Zissimopoulos
Product version2019.1
File version1.4.19016.0eb84d6

Digital signatures [?]

winfsp-x64.dll has a valid digital signature.

PropertyValue
Signer nameLLC Mail.Ru
Certificate issuer namethawte SHA256 Code Signing CA
Certificate serial number6d5da98939da5017b80168d309dd3367

VirusTotal report

None of the 69 anti-virus programs at VirusTotal detected the winfsp-x64.dll file.

None of the 69 anti-virus programs detected the winfsp-x64.dll file.

Sandbox Report

The following information was gathered by executing the file inside Cuckoo Sandbox.

Summary

Successfully executed process in sandbox.

Summary

{
    "dll_loaded": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
    ],
    "file_opened": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
    ],
    "command_line": [
        "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll,DllMain"
    ],
    "file_exists": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll.manifest"
    ],
    "file_read": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2816,
        "summary": {
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
            ],
            "file_opened": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
            ],
            "command_line": [
                "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll,DllMain"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll.manifest"
            ],
            "file_read": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ]
        },
        "first_seen": 1573066385.6562,
        "ppid": 2016
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1573066385.3281,
        "ppid": 376
    },
    {
        "process_path": "C:\\Windows\\System32\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2588,
        "summary": {
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll.manifest"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ],
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5.bin.dll"
            ]
        },
        "first_seen": 1573066385.8438,
        "ppid": 2816
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "C:\\Users\\billziss\\Projects\\winfsp\\build\\VStudio\\build\\Release\\winfsp-x64.dll.pdb",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "has_pdb"
    }
]

Yara

The Yara rules did not detect anything in the file.

Network

{
    "tls": [],
    "udp": [
        {
            "src": "192.168.56.101",
            "dst": "192.168.56.255",
            "offset": 546,
            "time": 3.0648519992828,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5074,
            "time": 2.9992949962616,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5402,
            "time": 1.0196077823639,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5730,
            "time": 3.0067179203033,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6058,
            "time": 1.5205459594727,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6386,
            "time": -0.1004331111908,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 6714,
            "time": 1.5472569465637,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 16512,
            "time": 1.0528337955475,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 24896,
            "time": 3.1103749275208,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "75788dc173dc2336e1397220eacbfb30621f7e67bab520a82121f620df672007",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "932050f798c594554c9a24f76dfee55f14d218ab034aea21f9d0cdb190176cce",
    "irc": [],
    "https_ex": []
}

Screenshots

Screenshot from the sandboxScreenshot from the sandbox

Hashes [?]

PropertyValue
MD57fea661f97d16d789a782684a5bb315c
SHA256199934722e2714785da8d35cc65d7cbd95daa4499fc41f4efaa79bd38ce21dc5

What will you do with winfsp-x64.dll?

To help other users, please let us know what you will do with winfsp-x64.dll:



What did other users do?

The poll result listed below shows what users chose to do with winfsp-x64.dll. 62% have voted for removal. Based on votes from 13 users.

User vote results: There were 8 votes to remove and 5 votes to keep

NOTE: Please do not use this poll as the only source of input to determine what you will do with winfsp-x64.dll. Only 13 users has voted so far so it does not offer a high degree of confidence.

Malware or legitimate?

If you feel that you need more information to determine if your should keep this file or remove it, please read this guide.

Please select the option that best describe your thoughts on the information provided on this web page


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Comments

Please share with the other users what you think about this file. What does this file do? Is it legitimate or something that your computer is better without? Do you know how it was installed on your system? Did you install it yourself or did it come bundled with some other software? Is it running smoothly or do you get some error message? Any information that will help to document this file is welcome. Thank you for your contributions.

I'm reading all new comments so don't hesitate to post a question about the file. If I don't have the answer perhaps another user can help you.

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