Ransom:Win64/Ryuk.A

Written by Robert Bailey

What is Ransom:Win64/Ryuk.A infection?

In this post you will certainly find concerning the meaning of Ransom:Win64/Ryuk.A and its negative influence on your computer system. Such ransomware are a form of malware that is clarified by on-line fraudulences to require paying the ransom money by a target.

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In the majority of the situations, Ransom:Win64/Ryuk.A ransomware will certainly instruct its targets to initiate funds transfer for the function of counteracting the changes that the Trojan infection has actually presented to the target’s tool.

Ransom:Win64/Ryuk.A Summary

These adjustments can be as follows:

  • Injection with CreateRemoteThread in a remote process;
  • 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.;
  • 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.
  • Uses Windows utilities for basic functionality;
  • Deletes its original binary from disk;
  • Code injection with CreateRemoteThread in a remote process;
  • 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;
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the records situated on the victim’s hard drive — so the target can no longer make use of the data;
  • Preventing normal 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
z.whorecord.xyzTrojan.Ransom.Ryuk.A
a.tomx.xyzTrojan.Ransom.Ryuk.A

Ransom:Win64/Ryuk.A

One of the most normal channels through which Ransom:Win64/Ryuk.A Trojans are injected are:

  • By means of phishing e-mails;
  • As a consequence of individual winding up on a resource that hosts a destructive software;

As quickly as the Trojan is effectively infused, it will either cipher the data on the victim’s PC or protect against the tool from operating in an appropriate way – while likewise putting a ransom money note that discusses the requirement for the targets to impact the repayment for the purpose of decrypting the records or recovering the data system back to the preliminary problem. In a lot of instances, the ransom note will certainly come up when the customer reboots the PC after the system has actually currently been harmed.

Ransom:Win64/Ryuk.A circulation networks.

In numerous corners of the globe, Ransom:Win64/Ryuk.A expands by leaps as well as bounds. Nonetheless, the ransom money notes and methods of obtaining the ransom money amount might vary depending upon particular neighborhood (regional) settings. The ransom notes and techniques of extorting the ransom quantity may differ depending on specific neighborhood (local) setups.

Ransomware injection

For instance:

    Faulty notifies concerning unlicensed software program.

    In particular areas, the Trojans frequently wrongfully report having actually spotted some unlicensed applications allowed on the target’s gadget. The alert after that requires the customer to pay the ransom.

    Faulty declarations about prohibited web content.

    In nations where software program piracy is less preferred, this approach is not as effective for the cyber fraudulences. Additionally, the Ransom:Win64/Ryuk.A popup alert may incorrectly declare to be stemming from a law enforcement establishment and will report having located child porn or other unlawful information on the gadget.

    Ransom:Win64/Ryuk.A popup alert may incorrectly declare to be deriving from a law enforcement institution and also will report having located youngster pornography or various other illegal information on the gadget. The alert will in a similar way consist of a requirement for the individual to pay the ransom.

Technical details

File Info:

crc32: 34DEA906
md5: ab9efa39a5aecf383c095401c1b6c658
name: tmpbqyqmk66
sha1: f72409d3048d4c62cc12ceee280750f44e7eb3fc
sha256: 3af6d8ae486dc533fdbb81ca77b33765b9652d173c490862b9b7ea9d42f46794
sha512: f4ff7547104c9de4c018daa36e7d60612691c4e07573a2bfe7fdf7dbdad9380251dad76a44a97d4c1eb81c1cc4584ce8c41888c892cd4b947061b5fc90964bb2
ssdeep: 6144:V5yaXtrA/WSo1rl3ALrlHQpn0BwK3SBDmhYfFQu:VTX6WSofcZ+KCIGH
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Ransom:Win64/Ryuk.A also known as:

GridinSoftTrojan.Ransom.Gen
BkavW32.AIDetectVM.malwareB
MicroWorld-eScanTrojan.Ransom.Ryuk.A
FireEyeGeneric.mg.ab9efa39a5aecf38
CAT-QuickHealRansom.Ryuk.S4761698
McAfeeArtemis!AB9EFA39A5AE
CylanceUnsafe
ZillyaTrojan.Ransom.Win32.1398
K7AntiVirusTrojan ( 0053a8931 )
AlibabaRansom:Win32/GenKryptik.f5b4346e
K7GWTrojan ( 0053a8931 )
Cybereasonmalicious.9a5aec
ArcabitTrojan.Ransom.Ryuk.A
TrendMicroRansom_Ryuk.R002C0DFG20
SymantecRansom.Hermes
ESET-NOD32a variant of Win32/GenKryptik.CSZN
APEXMalicious
Paloaltogeneric.ml
ClamAVWin.Ransomware.Ryuk-6688842-0
GDataTrojan.Ransom.Ryuk.A
KasperskyHEUR:Trojan.Win32.Invader
BitDefenderTrojan.Ransom.Ryuk.A
NANO-AntivirusTrojan.Win32.Invader.fgronb
AvastWin64:RansomX-gen [Ransom]
RisingRansom.Jabaxsta!1.B3AA (CLOUD)
Ad-AwareTrojan.Ransom.Ryuk.A
SophosTroj/Ransom-FAF
F-SecureHeuristic.HEUR/AGEN.1103406
DrWebTrojan.Encoder.10700
VIPRETrojan.Win32.Generic!BT
Invinceaheuristic
McAfee-GW-EditionBehavesLike.Win32.Generic.fh
EmsisoftTrojan.Ransom.Ryuk.A (B)
SentinelOneDFI – Malicious PE
JiangminTrojan.Invader.bsk
WebrootW32.Trojan.Ransom.Ryuk
AviraHEUR/AGEN.1103406
eGambitUnsafe.AI_Score_99%
Antiy-AVLTrojan/Win32.Invader
MicrosoftRansom:Win64/Ryuk.A
Endgamemalicious (high confidence)
AegisLabTrojan.Win32.Invader.4!c
ZoneAlarmHEUR:Trojan.Win32.Invader
CynetMalicious (score: 100)
Acronissuspicious
VBA32BScope.Trojan.Occamy
ALYacTrojan.Ransom.Ryuk.A
MAXmalware (ai score=81)
MalwarebytesRansom.FileCryptor
TrendMicro-HouseCallRansom_Ryuk.R002C0DFG20
TencentWin32.Trojan.Invader.Lpbq
YandexTrojan.Invader!
IkarusTrojan-Ransom.Ryuk
MaxSecureTrojan.Malware.121218.susgen
FortinetW64/Filecoder.T!tr
BitDefenderThetaGen:NN.ZexaF.34128.yyW@auWZxYfi
AVGWin64:RansomX-gen [Ransom]
PandaTrj/GdSda.A
CrowdStrikewin/malicious_confidence_100% (W)

How to remove Ransom:Win64/Ryuk.A 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 Ransom:Win64/Ryuk.A 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 Ransom:Win64/Ryuk.A 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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