Ransom:Win32/Grymegat.B
What is Ransom:Win32/Grymegat.B infection?
In this short article you will certainly discover concerning the meaning of Ransom:Win32/Grymegat.B and its negative influence on your computer system. Such ransomware are a form of malware that is specified by on-line frauds to require paying the ransom by a victim.
In the majority of the instances, Ransom:Win32/Grymegat.B ransomware will certainly instruct its targets to start funds move for the function of reducing the effects of the modifications that the Trojan infection has presented to the sufferer’s tool.
Ransom:Win32/Grymegat.B Summary
These adjustments can be as adheres to:
- Injection (inter-process);
- Injection (Process Hollowing);
- Attempts to connect to a dead IP:Port (1 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.
- Possible date expiration check, exits too soon after checking local time;
- 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.
- Unconventionial language used in binary resources: Spanish (El Salvador);
- Uses Windows utilities for basic functionality;
- Executed a process and injected code into it, probably while unpacking;
- Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
- Creates or sets a registry key to a long series of bytes, possibly to store a binary or malware config;
- 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
- 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.
- Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
- Operates on local firewall’s policies and settings;
- Creates a copy of itself;
- Attempts to disable UAC.
User Account Control or just UAC is a part of the Windows security system which prevents apps from making unwanted changes on PC.
UAC includes several technologies 1:
- File and egistry Virtualization;
- Same-desktop Elevation;
- Filtered Token;
- User Interface Privilege Isolation;
- Protected Mode Internet Explorer;
- Installer Detection;
- Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
- Uses suspicious command line tools or Windows utilities;
- Ciphering the documents located on the victim’s disk drive — so the target can no more make use of the information;
- Preventing routine accessibility 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.
| z.whorecord.xyz | Trojan.Ransomlock!g21 |
| a.tomx.xyz | Trojan.Ransomlock!g21 |
| warrantynetwork.co.in | Trojan.Ransomlock!g21 |
Ransom:Win32/Grymegat.B
One of the most typical networks whereby Ransom:Win32/Grymegat.B Ransomware are injected are:
- By means of phishing e-mails;
- As an effect of customer ending up on a resource that holds a harmful software;
As soon as the Trojan is efficiently injected, it will certainly either cipher the information on the victim’s PC or prevent the gadget from working in a correct way – while also placing a ransom note that states the demand for the targets to effect the repayment for the function of decrypting the files or restoring the data system back to the initial condition. In many circumstances, the ransom money note will show up when the customer reboots the COMPUTER after the system has currently been damaged.
Ransom:Win32/Grymegat.B distribution channels.
In numerous corners of the world, Ransom:Win32/Grymegat.B expands by jumps and bounds. Nonetheless, the ransom notes and methods of extorting the ransom money amount might differ depending on certain neighborhood (local) setups. The ransom notes and also techniques of obtaining the ransom amount might differ depending on certain regional (regional) settings.
For instance:
Faulty informs concerning unlicensed software.
In certain areas, the Trojans frequently wrongfully report having spotted some unlicensed applications enabled on the target’s tool. The sharp then requires the user to pay the ransom money.
Faulty statements concerning prohibited material.
In countries where software program piracy is much less preferred, this method is not as reliable for the cyber scams. Conversely, the Ransom:Win32/Grymegat.B popup alert may wrongly declare to be deriving from a law enforcement establishment as well as will report having situated youngster porn or other prohibited data on the device.
Ransom:Win32/Grymegat.B popup alert might incorrectly claim to be obtaining from a law enforcement organization and will report having situated child pornography or other illegal data on the device. The alert will similarly consist of a demand for the individual to pay the ransom money.
Technical details
File Info:
crc32: C6774A15md5: 0c577a1dc4975765d23bfdae0d721fa0name: 0C577A1DC4975765D23BFDAE0D721FA0.mlwsha1: f60c3ad30b805daca607d663b5b26f9493a1f9c3sha256: 4fdcff576232f30dfe46fd9df02323d6846ab676a42a57d777a507ad26f46346sha512: ad43b7bf0ee9964755a95669afa89b74c9915f4fbec02e07e0c0b4c730b664c8854f649157a08d977d07ecf5dc09f577b7d00438617c27b3b630ce302c3ef6ebssdeep: 3072:kt0ZqVocYKCcYdNEeL9lHg6JuvhAcRu7:kt0ZqmcYxvLL9W6JCLtype: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS WindowsVersion Info:
LegalCopyright: Copyright (c) 2009 IBM.com All Rights ReservedInternalName: IBMFileVersion: 3.00.009CompanyName: LegalTrademarks: IBM.comComments: IBM - microprocessor emulatorProductName: IBM Microprocessor EmulatorProductVersion: 3.00.009FileDescription: IBMOriginalFilename: IBM.exeTranslation: 0x0409 0x04b0
Ransom:Win32/Grymegat.B also known as:
| GridinSoft | Trojan.Ransom.Gen |
| Bkav | W32.AIDetect.malware1 |
| Elastic | malicious (high confidence) |
| DrWeb | Trojan.DownLoader7.26582 |
| MicroWorld-eScan | Gen:Heur.Zygug.6 |
| FireEye | Generic.mg.0c577a1dc4975765 |
| ALYac | Gen:Heur.Zygug.6 |
| Cylance | Unsafe |
| VIPRE | Trojan.Win32.Encpk.ahq (v) |
| Sangfor | Trojan.Win32.Save.a |
| K7AntiVirus | Trojan ( 0040f1d41 ) |
| BitDefender | Gen:Heur.Zygug.6 |
| K7GW | Trojan ( 0040f1d41 ) |
| Cybereason | malicious.dc4975 |
| BitDefenderTheta | Gen:NN.ZexaF.34590.hG0@aehE9XhO |
| Symantec | Trojan.Ransomlock!g21 |
| APEX | Malicious |
| Avast | Win32:Cryptor |
| Kaspersky | HEUR:Trojan.Win32.Generic |
| Alibaba | Ransom:Win32/Grymegat.0f124591 |
| NANO-Antivirus | Virus.Win32.Gen-Crypt.ccnc |
| AegisLab | Trojan.Win32.Generic.lEkh |
| Rising | Ransom.Grymegat!8.3182 (CLOUD) |
| Ad-Aware | Gen:Heur.Zygug.6 |
| Sophos | ML/PE-A + Mal/EncPk-AHQ |
| Comodo | TrojWare.Win32.PWS.ZBot.AAA@4sq88d |
| F-Secure | |
| Zillya | Dropper.Dycler.Win32.108 |
| TrendMicro | TROJ_RANSOM.SMWX |
| McAfee-GW-Edition | BehavesLike.Win32.PUPInstaller.ch |
| Emsisoft | Gen:Heur.Zygug.6 (B) |
| SentinelOne | Static AI – Suspicious PE |
| Jiangmin | Trojan.Generic.dvmwl |
| Avira | TR/Dropper.Gen7 |
| Antiy-AVL | Trojan/Win32.AGeneric |
| Kingsoft | Win32.Troj.Dycler.sv.(kcloud) |
| Microsoft | Ransom:Win32/Grymegat.B |
| Arcabit | Trojan.Zygug.6 |
| ZoneAlarm | HEUR:Trojan.Win32.Generic |
| GData | Gen:Heur.Zygug.6 |
| Cynet | Malicious (score: 90) |
| AhnLab-V3 | Trojan/Win32.Ransomlock.R43576 |
| McAfee | Ransom-AAY.gen.k |
| MAX | malware (ai score=100) |
| VBA32 | BScope.Malware-Cryptor.Oop |
| Malwarebytes | |
| Panda | Generic Malware |
| ESET-NOD32 | a variant of Win32/Injector.YFO |
| TrendMicro-HouseCall | TROJ_RANSOM.SMWX |
| Tencent | Win32.Trojan.Generic.Glr |
| Yandex | Trojan.Injector!mfBdsIIoqPM |
| Ikarus | Trojan.Win32.Tobfy |
| eGambit | Generic.Malware |
| Fortinet | W32/RANSOM.AAY!tr |
| Webroot | Trojan.Dropper.Gen |
| AVG | Win32:Cryptor |
| Paloalto | generic.ml |
| CrowdStrike | win/malicious_confidence_70% (W) |
| Qihoo-360 | Win32/Ransom.Generic.HwQAynsA |
How to remove Ransom:Win32/Grymegat.B ransomware?
There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft">3.
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/Grymegat.B 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/Grymegat.B you can always ask me in the comments for getting help.
References
- Microsoft Ignite: How to disable User Account Control (UAC) on Windows Server
- GridinSoft Anti-Malware Review from HowToFix site:
- More information about GridinSoft products:
