What is e91df49aa29c4ee1721ff72faa5b70abb38d04ee?

e91df49aa29c4ee1721ff72faa5b70abb38d04ee is part of Microsoft Malware Protection and developed by Microsoft Corporation according to the e91df49aa29c4ee1721ff72faa5b70abb38d04ee version information.

e91df49aa29c4ee1721ff72faa5b70abb38d04ee's description is "Microsoft Antimalware WU Stub"

e91df49aa29c4ee1721ff72faa5b70abb38d04ee is digitally signed by Microsoft Corporation.

e91df49aa29c4ee1721ff72faa5b70abb38d04ee is usually located in the 'c:\Windows\SoftwareDistribution\Download\' folder.

None of the anti-virus scanners at VirusTotal reports anything malicious about e91df49aa29c4ee1721ff72faa5b70abb38d04ee.

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 71 anti-virus programs at VirusTotal detected the e91df49aa29c4ee1721ff72faa5b70abb38d04ee file.

Sandbox Report

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

Summary

Successfully executed process in sandbox.

Summary

{
    "file_opened": [
        "C:\\Windows\\System32\\MpSigStub.exe"
    ],
    "file_exists": [
        "C:\\Windows\\System32\\advapi32.dll",
        "C:\\Windows\\System32\\version.dll"
    ],
    "regkey_opened": [
        "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows Defender\\MpEngine",
        "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Microsoft Antimalware\\MpEngine",
        "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows Defender\\Features",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub"
    ],
    "regkey_written": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub\\LastStartTime",
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub\\LastExitCode"
    ],
    "dll_loaded": [
        "kernel32",
        "C:\\Windows\\system32\\advapi32.dll",
        "C:\\Windows\\system32\\version.dll"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1571781186.3281,
        "ppid": 376
    },
    {
        "process_path": "C:\\Users\\cuck\\AppData\\Local\\Temp\\0697ced29ba8a07eaf4f17951a318132f9aa16c8da6caa3196b85e87aebccdcd.bin",
        "process_name": "0697ced29ba8a07eaf4f17951a318132f9aa16c8da6caa3196b85e87aebccdcd.bin",
        "pid": 2436,
        "summary": {
            "file_opened": [
                "C:\\Windows\\System32\\MpSigStub.exe"
            ],
            "file_exists": [
                "C:\\Windows\\System32\\advapi32.dll",
                "C:\\Windows\\System32\\version.dll"
            ],
            "regkey_opened": [
                "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows Defender\\MpEngine",
                "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Microsoft Antimalware\\MpEngine",
                "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows Defender\\Features",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub"
            ],
            "regkey_written": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub\\LastStartTime",
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MpSigStub\\LastExitCode"
            ],
            "dll_loaded": [
                "kernel32",
                "C:\\Windows\\system32\\advapi32.dll",
                "C:\\Windows\\system32\\version.dll"
            ]
        },
        "first_seen": 1571781186.5625,
        "ppid": 1624
    }
]

Signatures

[
    {
        "markcount": 1,
        "families": [],
        "description": "This executable has a PDB path",
        "severity": 1,
        "marks": [
            {
                "category": "pdb_path",
                "ioc": "MpWUStub.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": "BINARY",
                "type": "ioc",
                "description": null
            },
            {
                "category": "resource name",
                "ioc": "CABINET",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "pe_unknown_resource_name"
    },
    {
        "markcount": 2,
        "families": [],
        "description": "Searches running processes potentially to identify processes for sandbox evasion, code injection or memory dumping",
        "severity": 2,
        "marks": [
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "SearchProtocolHost.exe",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 3004
                    },
                    "time": 1571781186.7655,
                    "tid": 2124,
                    "flags": {}
                },
                "pid": 2436,
                "type": "call",
                "cid": 91
            },
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "0697ced29ba8a07eaf4f17951a318132f9aa16c8da6caa3196b85e87aebccdcd.bin",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 2436
                    },
                    "time": 1571781186.7655,
                    "tid": 2124,
                    "flags": {}
                },
                "pid": 2436,
                "type": "call",
                "cid": 93
            }
        ],
        "references": [],
        "name": "injection_process_search"
    },
    {
        "markcount": 2,
        "families": [],
        "description": "The binary likely contains encrypted or compressed data indicative of a packer",
        "severity": 2,
        "marks": [
            {
                "entropy": 7.9586359482735,
                "section": {
                    "size_of_data": "0x0000fe00",
                    "virtual_address": "0x0003c000",
                    "entropy": 7.9586359482735,
                    "name": ".rsrc",
                    "virtual_size": "0x0000fd0c"
                },
                "type": "generic",
                "description": "A section with a high entropy has been found"
            },
            {
                "entropy": 0.2212543554007,
                "type": "generic",
                "description": "Overall entropy of this PE file is high"
            }
        ],
        "references": [
            "http:\/\/www.forensickb.com\/2013\/03\/file-entropy-explained.html",
            "http:\/\/virii.es\/U\/Using%20Entropy%20Analysis%20to%20Find%20Encrypted%20and%20Packed%20Malware.pdf"
        ],
        "name": "packer_entropy"
    },
    {
        "markcount": 1,
        "families": [],
        "description": "Expresses interest in specific running processes",
        "severity": 2,
        "marks": [
            {
                "category": "process",
                "ioc": "0697ced29ba8a07eaf4f17951a318132f9aa16c8da6caa3196b85e87aebccdcd.bin",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "process_interest"
    },
    {
        "markcount": 1,
        "families": [],
        "description": "Attempts to identify installed AV products by registry key",
        "severity": 3,
        "marks": [
            {
                "category": "registry",
                "ioc": "HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Microsoft Antimalware\\MpEngine",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "antiav_detectreg"
    }
]

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": 3.0782129764557,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2234,
            "time": 3.0180819034576,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2562,
            "time": 1.025573015213,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2890,
            "time": 3.0322558879852,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3218,
            "time": 1.5338118076324,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3546,
            "time": -0.097563982009888,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 3874,
            "time": 1.5497047901154,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 8350,
            "time": 1.0483939647675,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 12542,
            "time": 3.1276469230652,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "f087a39583864a20f087189a9c1ff4361abd54e13c9bfcc56e16b3917b09cb08",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "ec85e2566b352fc2459c6558aaa1e65018c4782dd814514b7483f6046c22e299",
    "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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