What is vaarclient.dll?

vaarclient.dll is part of Avast Antivirus and developed by AVAST Software according to the vaarclient.dll version information.

vaarclient.dll's description is "Avast vaarclient library"

vaarclient.dll is digitally signed by AVAST Software s.r.o..

vaarclient.dll is usually located in the 'c:\Program Files\AVAST Software\Avast\' folder.

Some of the anti-virus scanners at VirusTotal detected vaarclient.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

1 of the 64 anti-virus programs at VirusTotal detected the vaarclient.dll file. That's a 2% detection rate.

Scanner	Detection Name
CrowdStrike	win/malicious_confidence_60% (D)

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\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
    ],
    "file_opened": [
        "C:\\Windows\\System32\\en-US\\KERNELBASE.dll.mui",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
    ],
    "command_line": [
        "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll,DllMain"
    ],
    "file_exists": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll.manifest",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
    ],
    "file_read": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.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": 2800,
        "summary": {
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
            ],
            "file_opened": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
            ],
            "command_line": [
                "\"C:\\Windows\\System32\\rundll32.exe\" C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll,DllMain"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll.manifest",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
            ],
            "file_read": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ]
        },
        "first_seen": 1605919987.953125,
        "ppid": 2924
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1605919987.59375,
        "ppid": 376
    },
    {
        "process_path": "C:\\Windows\\System32\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 1676,
        "summary": {
            "file_opened": [
                "C:\\Windows\\System32\\en-US\\KERNELBASE.dll.mui"
            ],
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll.manifest",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.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"
            ],
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\375486b597323612e8aa7b2a0b15d65fe0f6854083be7594868e628f8012c08d.bin.dll"
            ]
        },
        "first_seen": 1605919988.125,
        "ppid": 2800
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "D:\\Workspace\\ForRelease\\avast\\BUILDS\\Release\\x64\\vaarclient.pdb",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "has_pdb"
    },
    {
        "markcount": 1,
        "families": [],
        "description": "The executable contains unknown PE section names indicative of a packer (could be a false positive)",
        "severity": 1,
        "marks": [
            {
                "category": "section",
                "ioc": ".didat",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "pe_features"
    }
]

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": 662,
            "time": 6.2205212116241455,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5190,
            "time": 6.156880140304565,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5518,
            "time": 4.154550075531006,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5846,
            "time": 6.167945146560669,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6174,
            "time": 4.798314094543457,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6502,
            "time": 3.0509331226348877,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 6830,
            "time": 4.721574068069458,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 15512,
            "time": 4.219774007797241,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 19704,
            "time": 6.264897108078003,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "dcb1d74ca9e350349b1554f10af8eb25d2d2539e788426cf36fb44774a61350e",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "6b5f08a9e59d7205850b5ec464e29618e7c15ced2e8d92de40990d2cb191606a",
    "irc": [],
    "https_ex": []
}

Screenshots

Other files also named vaarclient.dll

vaarclient.dll (3 votes)

Malware or legitimate?

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