What is mbahost.dll?

mbahost.dll is part of Windows Installer XML Toolset and developed by .NET Foundation according to the mbahost.dll version information.

mbahost.dll's description is "Managed Bootstrapper Application Host"

mbahost.dll is usually located in the 'c:\users\%USERNAME%\appdata\local\temp\{258cd688-120d-4fc7-bb8d-35b9f111bd8e}\.ba\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about mbahost.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 66 anti-virus programs at VirusTotal detected the mbahost.dll file.

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\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll.manifest"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
    ],
    "dll_loaded": [
        "kernel32",
        "api-ms-win-core-localization-l1-2-1",
        "api-ms-win-core-fibers-l1-1-1",
        "api-ms-win-core-synch-l1-2-0",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2800,
        "summary": {
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll.manifest"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ],
            "dll_loaded": [
                "kernel32",
                "api-ms-win-core-localization-l1-2-1",
                "api-ms-win-core-fibers-l1-1-1",
                "api-ms-win-core-synch-l1-2-0",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\b925d9d3e1e2c49bf05a1b0713e2750ee6e0c43c7adc9d3c3a1b9fb8c557c3df.bin.dll"
            ]
        },
        "first_seen": 1574837586.71875,
        "ppid": 2924
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1574837586.328125,
        "ppid": 376
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "C:\\agent\\_work\\8\\s\\build\\ship\\x86\\mbahost.pdb",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "has_pdb"
    },
    {
        "markcount": 1,
        "families": [],
        "description": "Allocates read-write-execute memory (usually to unpack itself)",
        "severity": 2,
        "marks": [
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "NtProtectVirtualMemory",
                    "return_value": 0,
                    "arguments": {
                        "process_identifier": 2800,
                        "stack_dep_bypass": 0,
                        "stack_pivoted": 0,
                        "heap_dep_bypass": 0,
                        "length": 4096,
                        "protection": 64,
                        "process_handle": "0xffffffff",
                        "base_address": "0x74f84000"
                    },
                    "time": 1574837586.81275,
                    "tid": 2816,
                    "flags": {
                        "protection": "PAGE_EXECUTE_READWRITE"
                    }
                },
                "pid": 2800,
                "type": "call",
                "cid": 10
            }
        ],
        "references": [],
        "name": "allocates_rwx"
    }
]

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": 6.210579872131348,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4434,
            "time": 6.171045780181885,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4762,
            "time": 4.1457579135894775,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5090,
            "time": 6.182775974273682,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5418,
            "time": 4.651064872741699,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 5746,
            "time": 3.0440309047698975,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 6074,
            "time": 4.663251876831055,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 14756,
            "time": 4.175915956497192,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 18948,
            "time": 6.272861957550049,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "979cd6ccff5aac6bfa7cea818b3b37e95f2a8d4553e658f0a81c6b86c3dc566d",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "6c9c1868e483b5399d66edf4a93075d2824fd54d889a06db3cc00d09c720a802",
    "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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