What is System.Buffers.dll?

System.Buffers.dll is part of Microsoft® .NET Framework and developed by Microsoft Corporation according to the System.Buffers.dll version information.

System.Buffers.dll's description is "System.Buffers"

System.Buffers.dll is digitally signed by Microsoft Corporation.

System.Buffers.dll is usually located in the 'c:\Program Files\WindowsApps\Microsoft.YourPhone_1.20071.95.0_x64__8wekyb3d8bbwe\YourPhoneServer\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about System.Buffers.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.

VirusTotal report

None of the 72 anti-virus programs at VirusTotal detected the System.Buffers.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": [
        "ADVAPI32.dll",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
    ],
    "file_opened": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
    ],
    "regkey_opened": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\Upgrades",
        "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\.NETFramework",
        "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\.NETFramework\\Policy\\",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\Standards",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\AppPatch",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\v2.0",
        "HKEY_CURRENT_USER\\Software\\Microsoft\\.NETFramework"
    ],
    "file_exists": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll.manifest",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\IJWEntrypointCompatMode",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\InstallRoot"
    ],
    "directory_enumerated": [
        "C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727\\mscoreei.dll",
        "C:\\Windows\\Microsoft.NET\\Framework\\Upgrades.2.0.50727\\mscoreei.dll"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2124,
        "summary": {
            "dll_loaded": [
                "ADVAPI32.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
            ],
            "file_opened": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
            ],
            "regkey_opened": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\Upgrades",
                "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\.NETFramework",
                "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\.NETFramework\\Policy\\",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\Standards",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\AppPatch",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\Policy\\v2.0",
                "HKEY_CURRENT_USER\\Software\\Microsoft\\.NETFramework"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll.manifest",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\accccfbe45d9f08ffeed9916e37b33e98c65be012cfff6e7fa7b67210ce1fefb.bin.dll"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\IJWEntrypointCompatMode",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Microsoft\\.NETFramework\\InstallRoot"
            ],
            "directory_enumerated": [
                "C:\\Windows\\Microsoft.NET\\Framework\\v2.0.50727\\mscoreei.dll",
                "C:\\Windows\\Microsoft.NET\\Framework\\Upgrades.2.0.50727\\mscoreei.dll"
            ]
        },
        "first_seen": 1595919187.59375,
        "ppid": 2504
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1595919187.328125,
        "ppid": 376
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "E:\\A\\_work\\156\\s\\corefx\\bin\\obj\\AnyOS.AnyCPU.Release\\System.Buffers\\netfx\\System.Buffers.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": 3.0785481929779053,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4318,
            "time": 3.0387380123138428,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4646,
            "time": 1.039457082748413,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4974,
            "time": 3.050218105316162,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5302,
            "time": 1.5494201183319092,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5630,
            "time": -0.08858489990234375,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 5958,
            "time": 1.563086986541748,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 14640,
            "time": 1.072916030883789,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 18832,
            "time": 3.1094970703125,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "8c4eb6154617e38692f38f763592293d5cb23b183e08cbcff302ac0129b6ed55",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "3c92bc2c5e24c330643330692c0de4dd6edeb67827b75aacd4de8ab30517844b",
    "irc": [],
    "https_ex": []
}

Screenshots

What did other users do?

The poll result listed below shows what users chose to do with the file. 40% have voted for removal. Based on votes from 5 users.

NOTE: Please do not use this poll as the only source of input to determine what you will do with the file. Only 5 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.

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