Backdoor:WinNT/PcClient!rfn

What is Backdoor:WinNT/PcClient!rfn infection?

In this post you will certainly discover about the interpretation of Backdoor:WinNT/PcClient!rfn and its unfavorable effect on your computer. Such ransomware are a kind of malware that is elaborated by on the internet frauds to demand paying the ransom money by a target.

GridinSoft Anti-Malware Review

It is better to prevent, than repair and repent!

When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
GridinSoft Anti-Malware 6-day trial available.
EULA | Privacy Policy | GridinSoft

In the majority of the cases, Backdoor:WinNT/PcClient!rfn infection will advise its victims to initiate funds move for the function of counteracting the changes that the Trojan infection has presented to the victim’s gadget.

Backdoor:WinNT/PcClient!rfn Summary

These alterations 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.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Attempts to connect to a dead IP:Port (3 unique times);
  • 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.
  • 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.

  • A process created a hidden window;
  • Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • Enumerates services, possibly for anti-virtualization;
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • 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
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Ciphering the files found on the victim’s hard drive — so the victim can no more utilize the information;
  • Preventing routine access to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.
Similar behavior
Related domains
microsoft-com.mail.protection.outlook.com BehavesLike.Win32.Ransomware.cc

Backdoor:WinNT/PcClient!rfn

One of the most typical channels where Backdoor:WinNT/PcClient!rfn are injected are:

  • By ways of phishing emails;
  • As a repercussion of user ending up on a resource that organizes a harmful software program;

As quickly as the Trojan is successfully infused, it will either cipher the information on the target’s PC or protect against the tool from working in an appropriate way – while likewise positioning a ransom note that points out the requirement for the victims to impact the payment for the objective of decrypting the documents or bring back the file system back to the preliminary condition. In many circumstances, the ransom note will turn up when the customer reboots the COMPUTER after the system has actually already been damaged.

Backdoor:WinNT/PcClient!rfn circulation channels.

In various corners of the globe, Backdoor:WinNT/PcClient!rfn expands by leaps and also bounds. Nevertheless, the ransom money notes and techniques of obtaining the ransom money amount may vary relying on specific neighborhood (local) setups. The ransom notes and also methods of obtaining the ransom amount may vary depending on certain local (local) setups.

Ransomware injection

For instance:

    Faulty signals concerning unlicensed software application.

    In specific areas, the Trojans typically wrongfully report having detected some unlicensed applications made it possible for on the sufferer’s tool. The sharp after that demands the user to pay the ransom money.

    Faulty statements concerning prohibited content.

    In nations where software piracy is much less popular, this method is not as effective for the cyber frauds. Conversely, the Backdoor:WinNT/PcClient!rfn popup alert might falsely declare to be deriving from a police establishment and will report having located kid pornography or other prohibited data on the gadget.

    Backdoor:WinNT/PcClient!rfn popup alert may falsely declare to be deriving from a regulation enforcement institution and will certainly report having situated youngster porn or various other unlawful data on the gadget. The alert will in a similar way contain a need for the user to pay the ransom money.

Technical details

File Info:

crc32: 333FA82E
md5: 14328666641095757ef647b785a7f8aa
name: 14328666641095757EF647B785A7F8AA.mlw
sha1: e8d72737e6bfafb0ef60cafabf3db2c7c112af70
sha256: 8ca00f20b85ec96622ad809e4ac830a5b055129e526ce9d1d13dc747824615e5
sha512: b399e5cb41fd3b956644e7f7981fc815b9a6cf272aced82911bb8f68338c17ff1b4d19b7146e19fe3e743f2a971c0c6a6e1d4b7b8397b530a8f023323d6b7b1e
ssdeep: 3072:u2W2fonh2dsssskFh5z184wp1+o75EZZ/PHKRj:Zxfoh2dssssKpgp1+25CZ/4
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Backdoor:WinNT/PcClient!rfn also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Gen:Variant.Fugrafa.75947
FireEye Generic.mg.1432866664109575
CAT-QuickHeal Backdoor.Tofsee.CH4
Qihoo-360 Generic/Trojan.b3b
ALYac Gen:Variant.Fugrafa.75947
Cylance Unsafe
VIPRE Trojan.Win32.Generic!BT
Sangfor Malware
K7AntiVirus Trojan ( 0056f4021 )
BitDefender Gen:Variant.Fugrafa.75947
K7GW Trojan ( 0056f4021 )
Cybereason malicious.664109
TrendMicro TROJ_KRYPTIK_GL04006F.UVPM
BitDefenderTheta Gen:NN.ZexaF.34634.hqW@aiHj2@hi
Cyren W32/Kryptik.CBX.gen!Eldorado
Symantec Packed.Generic.493
APEX Malicious
ClamAV Win.Dropper.Tofsee-8989051-1
Kaspersky HEUR:Trojan.Win32.Generic
Alibaba Trojan:Win32/Kryptik.92ba3184
Tencent Malware.Win32.Gencirc.11b13c5c
Ad-Aware Gen:Variant.Fugrafa.75947
Emsisoft Gen:Variant.Fugrafa.75947 (B)
Comodo .UnclassifiedMalware@0
F-Secure Heuristic.HEUR/AGEN.1105006
DrWeb Trojan.DownLoader25.60402
Invincea ML/PE-A + Mal/Elenoocka-E
McAfee-GW-Edition BehavesLike.Win32.Ransomware.cc
Sophos Mal/Elenoocka-E
Ikarus Trojan.Win32.Tofsee
Jiangmin Backdoor.Poison.bjv
Webroot W32.Trojan.Emotet
Avira HEUR/AGEN.1105006
MAX malware (ai score=88)
Antiy-AVL Trojan/Win32.TSGeneric
Microsoft Backdoor:WinNT/PcClient!rfn
Gridinsoft Trojan.Win32.Kryptik.oa
Arcabit Trojan.Fugrafa.D128AB
AhnLab-V3 Backdoor/Win32.Poison.R214116
ZoneAlarm HEUR:Trojan.Win32.Generic
GData Win32.Trojan.Kryptik.IO
Cynet Malicious (score: 100)
ESET-NOD32 a variant of Win32/Kryptik.FLEC
Acronis suspicious
McAfee GenericRXDJ-SS!143286666410
VBA32 BScope.TrojanPSW.Panda
Panda Trj/Genetic.gen
TrendMicro-HouseCall TROJ_KRYPTIK_GL04006F.UVPM
Rising Trojan.Kryptik!8.8 (TFE:5:1sVG02rMaMQ)
Yandex Trojan.GenAsa!3KinKB/2TVQ
SentinelOne Static AI – Malicious PE
eGambit Unsafe.AI_Score_99%
Fortinet W32/GenKryptik.CRPN!tr
AVG Win32:Trojan-gen
Avast Win32:Trojan-gen
CrowdStrike win/malicious_confidence_100% (D)

How to remove Backdoor:WinNT/PcClient!rfn ransomware?

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

The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

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 Backdoor:WinNT/PcClient!rfn 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:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Backdoor:WinNT/PcClient!rfn you can always ask me in the comments for getting help.

Sending
User Review
0 (0 votes)
Comments Rating 0 (0 reviews)

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.

Leave a Reply

Sending

This site uses Akismet to reduce spam. Learn how your comment data is processed.