Worm:Win32/Esfury

What is Worm:Win32/Esfury infection?

In this short article you will find about the meaning of Worm:Win32/Esfury and also its unfavorable effect on your computer. Such ransomware are a form of malware that is clarified by on-line scams to demand paying the ransom money by a victim.

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.

DOWNLOAD NOW

Gridinsoft Anti-Malware 6-day trial available.
EULA | Privacy Policy | 10% Off Coupon

Subscribe to our Telegram channel to be the first to know about news and our exclusive materials on information security.

In the majority of the cases, Worm:Win32/Esfury infection will certainly instruct its targets to launch funds move for the objective of counteracting the changes that the Trojan infection has introduced to the sufferer’s gadget.

Worm:Win32/Esfury Summary

These adjustments can be as adheres to:

• 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);
• Presents an Authenticode digital signature;
• 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;
• A process attempted to delay the analysis task.;
• Attempts to connect to a dead IP:Port (22 unique times);
• 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.

• Attempts to modify Internet Explorer’s start page;
• HTTP traffic contains suspicious features which may be indicative of malware related traffic;
• Performs some HTTP requests;
• Unconventionial language used in binary resources: Spanish (Peru);
• 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;
• Executed a process and injected code into it, probably while unpacking;
• Steals private information from local Internet browsers;
• A system process is generating network traffic likely as a result of process injection;
• Network activity contains more than one unique useragent.;
• 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 System Restore. System Restore function – allows you to revert the computer’s state (system files, applications, and system settings) to that of a previous point in time, which can be used to recover after a virus attack.
• 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;
• The sample wrote data to the system hosts file.;
• Attempts to modify or disable Security Center warnings;
• Attempts to modify UAC prompt behavior;
• Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
• Attempts to modify Explorer settings to prevent file extensions from being displayed;
• Attempts to modify Explorer settings to prevent hidden files from being displayed;
• Ciphering the files found on the sufferer’s hard disk drive — so the target can no longer make use of the information;
• Preventing routine access to the sufferer’s workstation;

Similar behavior

Related domains

Worm:Win32/Esfury

One of the most common channels through which Worm:Win32/Esfury are injected are:

• By methods of phishing emails;
• As a consequence of individual ending up on a source that holds a destructive software program;

As soon as the Trojan is efficiently injected, it will either cipher the data on the sufferer’s computer or avoid the tool from working in a correct way – while additionally placing a ransom note that points out the requirement for the sufferers to impact the repayment for the function of decrypting the records or restoring the documents system back to the first condition. In many instances, the ransom note will certainly show up when the client restarts the COMPUTER after the system has actually already been damaged.

Worm:Win32/Esfury circulation channels.

In different corners of the world, Worm:Win32/Esfury expands by jumps as well as bounds. However, the ransom money notes and techniques of extorting the ransom quantity might vary depending on specific local (local) settings. The ransom notes as well as techniques of extorting the ransom money quantity may vary depending on particular regional (local) settings.

As an example:

Faulty notifies concerning unlicensed software.

In specific locations, the Trojans typically wrongfully report having detected some unlicensed applications allowed on the target’s tool. The sharp after that requires the user to pay the ransom.

Faulty statements regarding prohibited web content.

In nations where software application piracy is much less prominent, this method is not as efficient for the cyber scams. Conversely, the Worm:Win32/Esfury popup alert might wrongly assert to be deriving from a law enforcement institution and will report having situated kid porn or various other unlawful information on the gadget.

Worm:Win32/Esfury popup alert might falsely declare to be acquiring from a law enforcement organization and also will certainly report having situated child porn or various other illegal information on the device. The alert will in a similar way include a need for the individual to pay the ransom money.

Technical details

File Info:
crc32: 1F6B70E0
md5: a8e7a9ab838e2cdd2d7a2f4dd49af190
name: A8E7A9AB838E2CDD2D7A2F4DD49AF190.mlw
sha1: 8058431ccd946d4586923c5976bc4e13c1bf2f19
sha256: 4de9d63fb103eb2eae99d9428c35597ed20f8e354cec8c899738a8a5c2d9391f
sha512: 89067d81e4a080200c1879a2db59c2f06cbef898a36ebec84fe1485f17a10f09147ccc6d76de8d1cdd43c70584c4e78f052b6660e21e4bbc05c3347016ab071c
ssdeep: 1536:JNhENNo2oa5pHwAVvu0IysOPv3YdI3EpCK+V5iR/yKoDn66XujshkGXE7rFKh:JgN5ogyJ0XgdsEIKlyKo26Jkj7rF
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:
0: [No Data]

Worm:Win32/Esfury also known as:

How to remove Worm:Win32/Esfury 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 GridinSoft²

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft³.

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.

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 Worm:Win32/Esfury 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 Worm:Win32/Esfury you can always ask me in the comments for getting help.

1. Microsoft Ignite: How to disable User Account Control (UAC) on Windows Server
2. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
3. More information about GridinSoft products: https://gridinsoft.com/comparison