Ransom:Win32/Ryuk.S!MTB
James White
Updated on March 24, 2026
What is Ransom:Win32/Ryuk.S!MTB infection?
In this post you will discover concerning the meaning of Ransom:Win32/Ryuk.S!MTB and also its adverse impact on your computer. Such ransomware are a form of malware that is specified by on the internet scams to require paying the ransom money by a target.
Most of the instances, Ransom:Win32/Ryuk.S!MTB virus will certainly instruct its targets to start funds transfer for the objective of counteracting the amendments that the Trojan infection has introduced to the victim’s gadget.
Ransom:Win32/Ryuk.S!MTB 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 created a hidden window;
- 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;
- Uses Windows utilities for basic functionality;
- 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.
- Ciphering the documents located on the victim’s hard disk — so the target can no more utilize the information;
- Preventing regular 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.
Ransom:Win32/Ryuk.S!MTB
The most regular networks through which Ransom:Win32/Ryuk.S!MTB are injected are:
- By means of phishing emails;
- As an effect of customer winding up on a source that hosts a malicious software application;
As soon as the Trojan is efficiently injected, it will certainly either cipher the information on the sufferer’s PC or protect against the tool from operating in an appropriate manner – while additionally putting a ransom money note that states the need for the targets to effect the repayment for the purpose of decrypting the files or recovering the documents system back to the initial problem. In a lot of circumstances, the ransom money note will certainly turn up when the client restarts the PC after the system has already been harmed.
Ransom:Win32/Ryuk.S!MTB distribution networks.
In various edges of the globe, Ransom:Win32/Ryuk.S!MTB grows by leaps and also bounds. Nevertheless, the ransom money notes as well as tricks of extorting the ransom amount may vary relying on particular neighborhood (local) settings. The ransom notes and also tricks of extorting the ransom money amount might vary depending on specific local (local) settings.
For instance:
Faulty notifies concerning unlicensed software application.
In particular areas, the Trojans typically wrongfully report having spotted some unlicensed applications made it possible for on the sufferer’s gadget. The sharp after that requires the customer to pay the ransom.
Faulty declarations regarding prohibited material.
In nations where software piracy is less prominent, this method is not as effective for the cyber fraudulences. Alternatively, the Ransom:Win32/Ryuk.S!MTB popup alert might falsely declare to be stemming from a law enforcement institution as well as will certainly report having located youngster pornography or various other illegal information on the tool.
Ransom:Win32/Ryuk.S!MTB popup alert might falsely assert to be deriving from a legislation enforcement institution and will certainly report having situated child porn or various other illegal information on the gadget. The alert will in a similar way include a demand for the user to pay the ransom money.
Technical details
File Info:
crc32: 0597BC74md5: a2ea3c46d0a15c29fcd2000b1da24657name: A2EA3C46D0A15C29FCD2000B1DA24657.mlwsha1: 8682038788db406bc5328757541b9da69d9304adsha256: 7b91993341995065df2a78819d0984fa7760c4bac8d50ad62d3150eeed2c3f8bsha512: 1f7d73101aed9d3c5b2e739944e4469957cb4a105f76e90ed4d77662e78e596af24562faf30e33ec7914563044268e86053ff215c03b787c0870a3ade1bf3b5essdeep: 1536:qrL3IugrPiNC2fmyht4cKOVJrgOZ/aNgzdiM9WRjgjP:spkiNiOjVyiaCdz9WRUjPtype: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressedVersion Info:
0: [No Data]
Ransom:Win32/Ryuk.S!MTB also known as:
| GridinSoft | Trojan.Ransom.Gen |
| Bkav | W32.AIDetect.malware1 |
| K7AntiVirus | Riskware ( 0040eff71 ) |
| DrWeb | Trojan.Encoder.10700 |
| Cynet | Malicious (score: 100) |
| ALYac | Trojan.Ransom.Ryuk |
| Cylance | Unsafe |
| Zillya | Trojan.Ransom.Win32.1388 |
| Sangfor | Trojan.Win32.Invader.ky |
| Alibaba | Ransom:Win32/Jabaxsta.4572e221 |
| K7GW | Riskware ( 0040eff71 ) |
| Cybereason | malicious.6d0a15 |
| Cyren | W32/Injector.A.gen!Eldorado |
| Symantec | Ransom.Ryuk |
| ESET-NOD32 | a variant of Win32/Filecoder.Ryuk.M |
| APEX | Malicious |
| TotalDefense | Win32/Susp.PackedProcInject_im |
| Avast | Win32:Malware-gen |
| ClamAV | Win.Ransomware.Ryuk-6688842-0 |
| Kaspersky | HEUR:Trojan.Win32.Invader |
| BitDefender | Trojan.Ransom.Ryuk.B |
| NANO-Antivirus | Trojan.Win32.Invader.fgwyzw |
| ViRobot | Trojan.Win32.Ryuk.143360[UPX] |
| MicroWorld-eScan | Trojan.Ransom.Ryuk.B |
| Tencent | Win32.Trojan.Filecoder.Lnoc |
| Ad-Aware | Trojan.Ransom.Ryuk.B |
| Sophos | Troj/Agent-AZQE |
| Comodo | Packed.Win32.MUPX.Gen@24tbus |
| BitDefenderTheta | AI:Packer.FCC23F1B1E |
| VIPRE | Trojan.Win32.Generic!BT |
| McAfee-GW-Edition | BehavesLike.Win32.Generic.lc |
| FireEye | Generic.mg.a2ea3c46d0a15c29 |
| Emsisoft | Trojan.Ransom.Ryuk.B (B) |
| SentinelOne | Static AI – Malicious PE |
| Avira | TR/ATRAPS.Gen |
| eGambit | Unsafe.AI_Score_91% |
| Microsoft | Ransom:Win32/Ryuk.S!MTB |
| Arcabit | Trojan.Ransom.Ryuk.B |
| AegisLab | Trojan.Win32.Generic.4!c |
| GData | Trojan.Ransom.Ryuk.B |
| TACHYON | Ransom/W32.Ryuk.143360 |
| AhnLab-V3 | Malware/Win32.Generic.C2715316 |
| McAfee | Artemis!A2EA3C46D0A1 |
| MAX | malware (ai score=100) |
| VBA32 | BScope.TrojanRansom.Cryptor |
| Malwarebytes | Malware.Heuristic.1003 |
| Panda | Trj/GdSda.A |
| Rising | Ransom.Jabaxsta!8.100EB (CLOUD) |
| Ikarus | Trojan-Ransom.Ryuk |
| MaxSecure | Trojan.Malware.300983.susgen |
| Fortinet | W32/Ryuk.B!tr.ransom |
| AVG | Win32:Malware-gen |
| Paloalto | generic.ml |
| Qihoo-360 | Win32/Trojan.Ransom.ce4 |
How to remove Ransom:Win32/Ryuk.S!MTB ransomware?
There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft">2.
Download GridinSoft Anti-Malware.
You can download GridinSoft Anti-Malware by clicking the button below:
Download GridinSoft Anti-MalwareRun 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.
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.
Press “Install” button.
Once installed, Anti-Malware will automatically run.
Wait for the Anti-Malware scan to complete.
GridinSoft Anti-Malware will automatically start scanning your system for Ransom:Win32/Ryuk.S!MTB 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.
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.
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 Anti-Malware
If the guide doesn’t help you to remove Ransom:Win32/Ryuk.S!MTB you can always ask me in the comments for getting help.
References
- GridinSoft Anti-Malware Review from HowToFix site:
- More information about GridinSoft products:
