What is a77da33312a32cc176c7c247f8f881acafe40e60?

a77da33312a32cc176c7c247f8f881acafe40e60 is part of Microsoft Malware Protection and developed by Microsoft Corporation according to the a77da33312a32cc176c7c247f8f881acafe40e60 version information.

a77da33312a32cc176c7c247f8f881acafe40e60's description is "Microsoft Antimalware WU Stub"

a77da33312a32cc176c7c247f8f881acafe40e60 is digitally signed by Microsoft Corporation.

a77da33312a32cc176c7c247f8f881acafe40e60 is usually located in the 'c:\Windows\SoftwareDistribution\Download\' folder.

Some of the anti-virus scanners at VirusTotal detected a77da33312a32cc176c7c247f8f881acafe40e60.

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.

Vendor and version information [?]

The following is the available information on a77da33312a32cc176c7c247f8f881acafe40e60:

PropertyValue
Product nameMicrosoft Malware Protection
Company nameMicrosoft Corporation
File descriptionMicrosoft Antimalware WU Stub
Internal nameAM_Delta_Patch_1.287.369.0.exe
Original filenameAM_Delta_Patch_1.287.369.0.exe
Legal copyright© Microsoft Corporation. All rights reserved.
Product version1.287.402.0
File version1.287.402.0

Here's a screenshot of the file properties when displayed by Windows Explorer:

Product nameMicrosoft Malware Protection
Company nameMicrosoft Corporation
File descriptionMicrosoft Antimalware WU Stub
Internal nameAM_Delta_Patch_1.287.369.0.exe
Original filenameAM_Delta_Patch_1.287.369.0.exe
Legal copyright© Microsoft Corporation. All rights..
Product version1.287.402.0
File version1.287.402.0

Digital signatures [?]

a77da33312a32cc176c7c247f8f881acafe40e60 has a valid digital signature.

PropertyValue
Signer nameMicrosoft Corporation
Certificate issuer nameMicrosoft Code Signing PCA
Certificate serial number33000001b1ddedba54e965b85f0001000001b1

VirusTotal report

1 of the 65 anti-virus programs at VirusTotal detected the a77da33312a32cc176c7c247f8f881acafe40e60 file. That's a 2% detection rate.

ScannerDetection Name
CrowdStrike win/malicious_confidence_80% (D)
1 of the 65 anti-virus programs detected the a77da33312a32cc176c7c247f8f881acafe40e60 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\\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": 1607244786.34375,
        "ppid": 376
    },
    {
        "process_path": "C:\\Users\\cuck\\AppData\\Local\\Temp\\1707eea71a90a1694ee27dcfeed4d581412ff333c5cfaec27c7823bdd7016111.bin",
        "process_name": "1707eea71a90a1694ee27dcfeed4d581412ff333c5cfaec27c7823bdd7016111.bin",
        "pid": 2460,
        "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\\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": 1607244786.59375,
        "ppid": 2676
    }
]

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": 5,
        "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": "python.exe",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 2060
                    },
                    "time": 1607244357.222021,
                    "tid": 2888,
                    "flags": {}
                },
                "pid": 2460,
                "type": "call",
                "cid": 81
            },
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "taskhost.exe",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 3000
                    },
                    "time": 1607244357.222021,
                    "tid": 2888,
                    "flags": {}
                },
                "pid": 2460,
                "type": "call",
                "cid": 82
            },
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "SearchProtocolHost.exe",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 2724
                    },
                    "time": 1607244357.222021,
                    "tid": 2888,
                    "flags": {}
                },
                "pid": 2460,
                "type": "call",
                "cid": 83
            },
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "SearchFilterHost.exe",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 2924
                    },
                    "time": 1607244357.222021,
                    "tid": 2888,
                    "flags": {}
                },
                "pid": 2460,
                "type": "call",
                "cid": 84
            },
            {
                "call": {
                    "category": "process",
                    "status": 1,
                    "stacktrace": [],
                    "api": "Process32NextW",
                    "return_value": 1,
                    "arguments": {
                        "process_name": "1707eea71a90a1694ee27dcfeed4d581412ff333c5cfaec27c7823bdd7016111.bin",
                        "snapshot_handle": "0x0000000000000040",
                        "process_identifier": 2460
                    },
                    "time": 1607244357.222021,
                    "tid": 2888,
                    "flags": {}
                },
                "pid": 2460,
                "type": "call",
                "cid": 85
            }
        ],
        "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": 7.996480740215591,
                "section": {
                    "size_of_data": "0x00048200",
                    "virtual_address": "0x00041000",
                    "entropy": 7.996480740215591,
                    "name": ".rsrc",
                    "virtual_size": "0x00048074"
                },
                "type": "generic",
                "description": "A section with a high entropy has been found"
            },
            {
                "entropy": 0.5438265786993403,
                "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": "1707eea71a90a1694ee27dcfeed4d581412ff333c5cfaec27c7823bdd7016111.bin",
                "type": "ioc",
                "description": null
            }
        ],
        "references": [],
        "name": "process_interest"
    }
]

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": 6.224639177322388,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2134,
            "time": 6.183411121368408,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2462,
            "time": 4.161978006362915,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 2790,
            "time": 6.198002099990845,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3118,
            "time": 4.665549993515015,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3446,
            "time": 3.0547900199890137,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 3774,
            "time": 4.692323207855225,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 7102,
            "time": 4.1995580196380615,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 11294,
            "time": 6.271018028259277,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "42196972cd025ef46611c79832c1d53b6b45cec31dd6e4408a6e394a7e85defc",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "24a411f9359e67203b45dce4d7fec8e30f4a547c0063543476cdac965822913f",
    "irc": [],
    "https_ex": []
}

Screenshots

Screenshot from the sandbox

Hashes [?]

PropertyValue
MD5fed1bd75a3207e5db96917a59e87bce6
SHA2561707eea71a90a1694ee27dcfeed4d581412ff333c5cfaec27c7823bdd7016111

What will you do with the file?

To help other users, please let us know what you will do with the file:



What did other users do?

The poll result listed below shows what users chose to do with the file. 100% have voted for removal. Based on votes from 1 user.

Votes
Keep0 %
0
Remove100 %
1

NOTE: Please do not use this poll as the only source of input to determine what you will do with the file. Only 1 user has voted so far so it does not offer a high degree of confidence.

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.

Please select the option that best describe your thoughts on the information provided on this web page


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Comments

Please share with the other users what you think about this file. What does this file do? Is it legitimate or something that your computer is better without? Do you know how it was installed on your system? Did you install it yourself or did it come bundled with some other software? Is it running smoothly or do you get some error message? Any information that will help to document this file is welcome. Thank you for your contributions.

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