What is rCrypt.dll?

rCrypt.dll is usually located in the 'c:\users\%USERNAME%\appdata\local\temp\nslc840.tmp\' folder.

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

Scanner	Detection Name
Trapmine	suspicious.low.ml.score

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\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll.manifest",
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll"
    ],
    "regkey_read": [
        "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
    ],
    "dll_loaded": [
        "C:\\Users\\cuck\\AppData\\Local\\Temp\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll"
    ]
}

Generic

[
    {
        "process_path": "C:\\Windows\\SysWOW64\\rundll32.exe",
        "process_name": "rundll32.exe",
        "pid": 2816,
        "summary": {
            "file_exists": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll.manifest",
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll"
            ],
            "regkey_read": [
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\GRE_Initialize\\DisableMetaFiles"
            ],
            "dll_loaded": [
                "C:\\Users\\cuck\\AppData\\Local\\Temp\\9207951ffbe8e7633def52bac1d8923336874534a99ad1815d5eb64c83161bf8.bin.dll"
            ]
        },
        "first_seen": 1605261200.671875,
        "ppid": 2016
    },
    {
        "process_path": "C:\\Windows\\System32\\lsass.exe",
        "process_name": "lsass.exe",
        "pid": 476,
        "summary": {},
        "first_seen": 1605261200.34375,
        "ppid": 376
    }
]

Signatures

[
    {
        "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": 2816,
                        "stack_dep_bypass": 0,
                        "stack_pivoted": 0,
                        "heap_dep_bypass": 0,
                        "length": 4096,
                        "protection": 64,
                        "process_handle": "0xffffffff",
                        "base_address": "0x74f2a000"
                    },
                    "time": 1605261200.781875,
                    "tid": 2420,
                    "flags": {
                        "protection": "PAGE_EXECUTE_READWRITE"
                    }
                },
                "pid": 2816,
                "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": 546,
            "time": 3.0782101154327393,
            "dport": 137,
            "sport": 137
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3346,
            "time": 3.0396060943603516,
            "dport": 5355,
            "sport": 51001
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 3674,
            "time": 1.0154719352722168,
            "dport": 5355,
            "sport": 53595
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4002,
            "time": 3.051630973815918,
            "dport": 5355,
            "sport": 53848
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4330,
            "time": 1.5199270248413086,
            "dport": 5355,
            "sport": 54255
        },
        {
            "src": "192.168.56.101",
            "dst": "224.0.0.252",
            "offset": 4658,
            "time": -0.09875607490539551,
            "dport": 5355,
            "sport": 55314
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 4986,
            "time": 1.5470380783081055,
            "dport": 1900,
            "sport": 1900
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 11456,
            "time": 1.0489940643310547,
            "dport": 3702,
            "sport": 49152
        },
        {
            "src": "192.168.56.101",
            "dst": "239.255.255.250",
            "offset": 15648,
            "time": 3.125185966491699,
            "dport": 1900,
            "sport": 53598
        }
    ],
    "dns_servers": [],
    "http": [],
    "icmp": [],
    "smtp": [],
    "tcp": [],
    "smtp_ex": [],
    "mitm": [],
    "hosts": [],
    "pcap_sha256": "ea17d06bf29d850e2dd32926f3243845ae31952142644fa429b531cbe8ae96dd",
    "dns": [],
    "http_ex": [],
    "domains": [],
    "dead_hosts": [],
    "sorted_pcap_sha256": "9d16956102b162f1d867bb93ad9665e9b9fd90e22900d17f28581f3d70e9423c",
    "irc": [],
    "https_ex": []
}

Screenshots

Folder name variants

rCrypt.dll may also be located in other folders than c:\users\%USERNAME%\appdata\local\temp\nslc840.tmp\. The most common variants are listed below:

• c:\TMP\nsiFE.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nsaba18.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nsb22fc.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nscd07a.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nsg9b57.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nsk1e7f.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nsqa0da.tmp\
• c:\users\%USERNAME%\appdata\local\temp\nst4491.tmp\

What did other users do?

The poll result listed below shows what users chose to do with rCrypt.dll. 25% have voted for removal. Based on votes from 4 users.

NOTE: Please do not use this poll as the only source of input to determine what you will do with rCrypt.dll. Only 4 users 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.

And now some shameless self promotion ;)

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