Win32/Filecoder.NRU

Written by Robert Bailey

What is Win32/Filecoder.NRU infection?

In this short article you will certainly find concerning the meaning of Win32/Filecoder.NRU as well as its negative impact on your computer system. Such ransomware are a form of malware that is clarified by online fraudulences to demand paying the ransom by a target.

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Most of the cases, Win32/Filecoder.NRU virus will certainly advise its victims to start funds transfer for the function of reducing the effects of the amendments that the Trojan infection has presented to the target’s tool.

Win32/Filecoder.NRU Summary

These modifications can be as follows:

  • Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • A process attempted to delay the analysis task.;
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • The executable is compressed using UPX;
  • Queries information on disks, possibly for anti-virtualization. Since VMs share the same disk space so it is expected that they won’t be getting as much space as an application running on
    native hardware will have access to.
  • Checks for the presence of known windows from debuggers and forensic tools;
  • Mimics the file times of a Windows system file;
  • Installs itself for autorun at Windows startup. There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup. Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • Exhibits possible ransomware file modification behavior;
  • Writes a potential ransom message to disk;
  • Likely virus infection of existing system binary;
  • Checks the version of Bios, possibly for anti-virtualization;
  • Detects VirtualBox through the presence of a registry key;
  • Creates a copy of itself;
  • Detected Armadillo packer using a known mutex;
  • Detected Armadillo packer using a known registry key;
  • Collects information to fingerprint the system. There are behavioral human characteristics that can be used to digitally identify a person to grant access to systems, devices, or data. Unlike passwords and verification codes, fingerprints are fundamental parts of user’s identities. Among the threats blocked on biometric data processing and storage systems is spyware, the malware used in phishing attacks (mostly spyware downloaders and droppers), ransomware, and Banking Trojans as posing the greatest danger.
  • Ciphering the papers located on the victim’s disk drive — so the sufferer can no longer use the data;
  • Preventing regular accessibility to the target’s workstation;

Win32/Filecoder.NRU

One of the most normal networks whereby Win32/Filecoder.NRU Trojans are injected are:

  • By ways of phishing emails;
  • As an effect of user ending up on a resource that hosts a destructive software application;

As quickly as the Trojan is effectively infused, it will certainly either cipher the information on the target’s PC or protect against the tool from functioning in an appropriate manner – while additionally putting a ransom note that discusses the need for the targets to impact the settlement for the purpose of decrypting the records or restoring the data system back to the preliminary problem. In most circumstances, the ransom note will certainly show up when the customer restarts the PC after the system has already been damaged.

Win32/Filecoder.NRU distribution networks.

In numerous corners of the world, Win32/Filecoder.NRU expands by leaps as well as bounds. However, the ransom money notes and also tricks of obtaining the ransom money quantity may differ depending upon specific regional (local) setups. The ransom notes and also techniques of extorting the ransom amount may vary depending on particular neighborhood (regional) setups.

Ransomware injection

For instance:

    Faulty alerts about unlicensed software.

    In specific areas, the Trojans often wrongfully report having actually discovered some unlicensed applications allowed on the target’s tool. The alert after that demands the user to pay the ransom money.

    Faulty declarations about unlawful content.

    In countries where software application piracy is less popular, this approach is not as reliable for the cyber scams. Alternatively, the Win32/Filecoder.NRU popup alert may wrongly assert to be deriving from a law enforcement organization as well as will certainly report having situated kid pornography or other unlawful data on the device.

    Win32/Filecoder.NRU popup alert might falsely declare to be obtaining from a law enforcement institution as well as will certainly report having located child pornography or various other illegal information on the gadget. The alert will in a similar way include a requirement for the customer to pay the ransom money.

Technical details

File Info:

crc32: D3ADF7E2
md5: adcbe85e28b6e83c3fbfdeaf5486823c
name: ADCBE85E28B6E83C3FBFDEAF5486823C.mlw
sha1: d4c1987c781a44844fe7e6b9c4b2da3915eaf14a
sha256: 98f105a61c37bd2f7d9dbf7ff5ab1fa1e864d98b1d7ffd0c05025a0ccb82bfb3
sha512: 36bb261f2e7e8f37987f790a52e8faa4aedb967da765232ed815e8949e7ac18340115ae761ad2d6e4f7f7d4e401960ac2ba4a63bd25aa389f1e4e02a49dfa9f4
ssdeep: 24576:6H/krfNLvZpJQU30gAnwQ1vz0/0Za/CDq4LBLZ+UelNayUSuStmCjabwpOZc70+w:5//iGuRCjabf2j5n/Th9anmWtMyMpy7b
type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed

Version Info:

0: [No Data]

Win32/Filecoder.NRU also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 004bcce41 )
Elastic malicious (high confidence)
Cynet Malicious (score: 100)
ALYac Trojan.GenericKD.40412660
Cylance Unsafe
Zillya Trojan.GenericKD.Win32.162693
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_80% (D)
Alibaba Ransom:Win32/Xorist.25cec7db
K7GW Trojan ( 004bcce41 )
Cybereason malicious.e28b6e
Symantec ML.Attribute.HighConfidence
ESET-NOD32 Win32/Filecoder.NRU
APEX Malicious
Avast Win32:Trojan-gen
ClamAV Win.Dropper.Hesv-9841932-0
Kaspersky Trojan-Ransom.Win32.Xorist.fnavu
BitDefender Trojan.GenericKD.40412660
NANO-Antivirus Trojan.Win32.Filecoder.fgwbdi
MicroWorld-eScan Trojan.GenericKD.40412660
Tencent Win32.Trojan.Raas.Auto
Ad-Aware Trojan.GenericKD.40412660
Sophos ML/PE-A
Comodo Malware@#21s6nnb9g8cb4
BitDefenderTheta Gen:NN.ZexaF.34688.2DW@ayIqubp
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition BehavesLike.Win32.Dropper.tc
FireEye Generic.mg.adcbe85e28b6e83c
Emsisoft Trojan.GenericKD.40412660 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Worm/Palevo.xel
Avira TR/Crypt.XPACK.Gen
Microsoft Trojan:Win32/Occamy.B
Arcabit Trojan.Generic.D268A5F4
AegisLab Trojan.Win32.Xorist.j!c
GData Trojan.GenericKD.40412660
AhnLab-V3 Trojan/Win32.Tepfer.C535668
Acronis suspicious
McAfee Artemis!ADCBE85E28B6
MAX malware (ai score=100)
VBA32 TrojanRansom.Xorist
Panda Trj/CI.A
Rising Ransom.Xorist!8.4A0 (CLOUD)
Yandex Trojan.Xorist!twASRq5MgRg
Ikarus Trojan.Crypt
Fortinet W32/Agent.5E0F!tr
AVG Win32:Trojan-gen
Paloalto generic.ml

How to remove Win32/Filecoder.NRU virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Win32/Filecoder.NRU files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

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If the guide doesn’t help you to remove Win32/Filecoder.NRU you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/products/

About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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