What is Sf2.dll?

Sf2.dll is part of Avast Antivirus and developed by AVAST Software according to the Sf2.dll version information.

Sf2.dll's description is "Dynamic binary instrumentator"

Sf2.dll is digitally signed by AVAST Software s.r.o..

Sf2.dll is usually located in the 'c:\Program Files\AVAST Software\Avast\defs\19022102\' folder.

Some of the anti-virus scanners at VirusTotal detected Sf2.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 65 anti-virus programs at VirusTotal detected the Sf2.dll file. That's a 2% detection rate.

Scanner	Detection Name
CrowdStrike	win/malicious_confidence_80% (D)

Sandbox Report

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

Summary

Successfully executed process in sandbox.

Summary

{
    "file_exists": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll.manifest"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
    ],
    "dll_loaded": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 1512,
        "summary": {
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll.manifest"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ],
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\cd138b870591b0108ee2f3b0ea7316bad8276d1f51fae8c9fc9bad04600bcd64.bin.dll"
            ]
        },
        "first_seen": 1606366386.859375,
        "ppid": 1564
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1606366386.5625,
        "ppid": 376
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "d:\\dev\\workspace\\Engine_Core_Final\\AVBranding\\avast\\AVRuntime\\v141\\CONFIG\\Release\\label\\WinClient\\BUILDSENG\\Release\\x86\\sf2.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": 3.0760350227355957,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5074,
            "time": 3.026319980621338,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5402,
            "time": 1.0177271366119385,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5730,
            "time": 3.0362281799316406,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6058,
            "time": 1.6256020069122314,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 6386,
            "time": -0.10033893585205078,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 6714,
            "time": 1.5794620513916016,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 15396,
            "time": 1.049901008605957,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 21684,
            "time": 3.1092631816864014,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "8781471a1d7c30076dc76586ad271d66fb06acd13688c15ad39ea541c3ea15c9",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "1dfa3063552cf63255a03ac5ae415ff3b59b00829cf68ea7e138ed2160f3991a",
    "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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