Written by Robert Bailey

What is Backdoor:Win32/Zegost!B infection?

In this article you will find concerning the definition of Backdoor:Win32/Zegost!B as well as its adverse influence on your computer. Such ransomware are a form of malware that is elaborated by on-line fraudulences to demand paying the ransom money by a sufferer.

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

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

Most of the instances, Backdoor:Win32/Zegost!B virus will advise its targets to initiate funds move for the objective of reducing the effects of the modifications that the Trojan infection has actually introduced to the sufferer’s tool.

Backdoor:Win32/Zegost!B Summary

These alterations 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.
  • 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.
  • Loads a driver;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • 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;
  • Deletes its original binary from disk;
  • A process attempted to delay the analysis task by a long amount of time.;
  • 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!
  • 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
  • Checks the CPU name from registry, possibly for anti-virtualization;
  • Creates a copy of itself;
  • 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 records situated on the victim’s hard disk drive — so the victim can no longer utilize the information;
  • Preventing routine accessibility to the victim’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.


The most typical networks through which Backdoor:Win32/Zegost!B are infused are:

  • By means of phishing e-mails;
  • As an effect of individual ending up on a source that organizes a harmful software program;

As quickly as the Trojan is effectively infused, it will either cipher the information on the sufferer’s PC or prevent the tool from working in an appropriate fashion – while additionally putting a ransom note that discusses the demand for the targets to effect the payment for the objective of decrypting the files or restoring the documents system back to the preliminary problem. In most instances, the ransom money note will show up when the client reboots the COMPUTER after the system has already been harmed.

Backdoor:Win32/Zegost!B distribution channels.

In various edges of the globe, Backdoor:Win32/Zegost!B grows by jumps and bounds. Nevertheless, the ransom money notes as well as methods of extorting the ransom amount might vary depending upon certain regional (local) settings. The ransom notes as well as tricks of obtaining the ransom money quantity may differ depending on certain regional (local) setups.

Ransomware injection

For instance:

    Faulty signals regarding unlicensed software.

    In specific locations, the Trojans often wrongfully report having detected some unlicensed applications allowed on the victim’s gadget. The alert after that demands the individual to pay the ransom.

    Faulty statements regarding illegal material.

    In nations where software program piracy is less prominent, this technique is not as reliable for the cyber frauds. Alternatively, the Backdoor:Win32/Zegost!B popup alert may falsely claim to be deriving from a police institution and will report having located youngster pornography or various other illegal information on the tool.

    Backdoor:Win32/Zegost!B popup alert might incorrectly declare to be acquiring from a legislation enforcement organization and will certainly report having located kid pornography or other prohibited information on the tool. The alert will similarly include a demand for the individual to pay the ransom.

Technical details

File Info:

crc32: 70A3B675
md5: 02a86585b912aa1eadba27c3bc7f5016
name: svchost.exe
sha1: 33fb668a5788c1042595461da08d106e96f3fcfe
sha256: dd4ed8e6d5960ab560d242531bc633b32a658d64b5e9a3d17edc04c06736c87f
sha512: 09c4c0d7e2fb997424c74bb18b8b77db27e923f9c38aa912dd12a8852d227fd4695055db6f797c1e66b56c05d5f871fcc425d4e16d343c98af2f161dd3197f2d
ssdeep: 6144:CSuxNOug5MI3KBau3EO8iZrEXA2czL6mWzdoZtAznpGuGEwJvfJ0sMVC:zux9g5F6U2WOWczLygAzN6fJR
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Backdoor:Win32/Zegost!B also known as:

GridinSoft Trojan.Ransom.Gen
MicroWorld-eScan DeepScan:Generic.Keylogger.2.814A8CD2
McAfee GenericRXJI-RH!02A86585B912
Cylance Unsafe
VIPRE Trojan.Win32.Generic!BT
Sangfor Malware
BitDefender DeepScan:Generic.Keylogger.2.814A8CD2
Cybereason malicious.5b912a
Invincea heuristic
Symantec ML.Attribute.HighConfidence
APEX Malicious
Avast Win32:Trojan-gen
ClamAV Win.Keylogger.Deepscan-7603977-0
GData DeepScan:Generic.Keylogger.2.814A8CD2
Kaspersky HEUR:Backdoor.Win32.Generic
NANO-Antivirus Trojan.Win32.Farfli.getkjn
Rising Backdoor.Zegost!8.177 (C64:YzY0Oi1ztX540ySW)
Endgame malicious (high confidence)
F-Secure Trojan.TR/Dropper.Gen
DrWeb Trojan.Rootkit.22030
Zillya Trojan.Farfli.Win32.33439
TrendMicro TROJ_GEN.R015C0DDQ20
McAfee-GW-Edition BehavesLike.Win32.VirRansom.fc
MaxSecure Trojan.Malware.7175197.susgen
Emsisoft DeepScan:Generic.Keylogger.2.814A8CD2 (B)
Ikarus Packed.Win32.Hrup
Jiangmin Backdoor.Generic.bafy
Avira TR/Dropper.Gen
MAX malware (ai score=89)
Antiy-AVL Trojan[Backdoor]/Win32.AGeneric
Microsoft Backdoor:Win32/Zegost.gen!B
Arcabit DeepScan:Generic.Keylogger.2.814A8CD2
ZoneAlarm HEUR:Backdoor.Win32.Generic
Acronis suspicious
BitDefenderTheta AI:Packer.E377263C1E
ALYac DeepScan:Generic.Keylogger.2.814A8CD2
VBA32 Trojan.Vehidis
ESET-NOD32 a variant of Win32/Farfli.CTT
TrendMicro-HouseCall TROJ_GEN.R015C0DDQ20
Tencent Malware.Win32.Gencirc.10b27783
Yandex Trojan.Farfli!FXmDwnTnypc
SentinelOne DFI – Suspicious PE
eGambit Unsafe.AI_Score_99%
Fortinet W32/Generic.AP.319CC8!tr
Ad-Aware DeepScan:Generic.Keylogger.2.814A8CD2
AVG Win32:Trojan-gen
CrowdStrike win/malicious_confidence_70% (D)
Qihoo-360 Win32/Backdoor.d55

How to remove Backdoor:Win32/Zegost!B 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 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:Win32/Zegost!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.

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:Win32/Zegost!B you can always ask me in the comments for getting help.

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


  1. GridinSoft Anti-Malware Review from HowToFix site:
  2. More information about GridinSoft 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


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