What is amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9?

amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9 is part of Microsoft® Windows® Operating System and developed by Microsoft Corporation according to the amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9 version information.

amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9's description is "Client Server Runtime Process"

amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9 is digitally signed by Microsoft Windows.

amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9 is usually located in the 'c:\Windows\winsxs\Backup\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9.

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 61 anti-virus programs at VirusTotal detected the amd64_microsoft-windows-csrsrv_31bf3856ad364e35_6.1.7601.24545_none_28172387d53288ba_csrsrv.dll_f50da7f9 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\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
    ],
    "file_opened": [
        "C:\\Windows\\System32\\en-US\\KERNELBASE.dll.mui",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
    ],
    "command_line": [
        "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll,DllMain"
    ],
    "file_exists": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll.manifest"
    ],
    "file_read": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\Windows Error Reporting\\WMR\\Disable",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 1664,
        "summary": {
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
            ],
            "file_opened": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
            ],
            "command_line": [
                "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll,DllMain"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll.manifest"
            ],
            "file_read": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ]
        },
        "first_seen": 1603731185.546875,
        "ppid": 2448
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1603731185.3125,
        "ppid": 376
    },
    {
        "process_path": "C:\\Windows\\System32\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2500,
        "summary": {
            "file_opened": [
                "C:\\Windows\\System32\\en-US\\KERNELBASE.dll.mui"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll.manifest"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\Windows Error Reporting\\WMR\\Disable",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ],
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\93e587d5a1f438a232ee82830f1d2fb25b4e517f909fd2f793c0749a7ed72ba2.bin.dll"
            ]
        },
        "first_seen": 1603731185.890625,
        "ppid": 1664
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "csrsrv.pdb",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "has_pdb"
    },
    {
        "markcount": 2,
        "families": [],
        "description": "The file contains an unknown PE resource name possibly indicative of a packer",
        "severity": 1,
        "marks": [
            {
                "category": "resource name",
                "ioc": "MUI",
                "type": "ioc",
                "description": null
            },
            {
                "category": "resource name",
                "ioc": "WEVT_TEMPLATE",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "pe_unknown_resource_name"
    }
]

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": 3.0631279945373535,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5074,
            "time": 3.003729820251465,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5402,
            "time": 1.0452778339385986,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5730,
            "time": 3.011009931564331,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6058,
            "time": 1.5490479469299316,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6386,
            "time": -0.09766006469726562,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 6714,
            "time": 1.5784428119659424,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 15396,
            "time": 1.079375982284546,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 19588,
            "time": 3.086190938949585,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "479ecbf643df594a0e021c5a212f8f5da708fd365170ba5e6480d8aa3b51ecad",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "85649fa32c8e6389d71446aeb9a5d72dc92493d98e801f2278fea8652636f8d4",
    "irc": [],
    "https_ex": []
}

Screenshots

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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