Written by Robert Bailey

What is Backdoor:Win32/Gaertob.A infection?

In this article you will certainly locate about the definition of Backdoor:Win32/Gaertob.A and also its unfavorable effect on your computer. Such ransomware are a kind of malware that is clarified by online scams to demand paying the ransom money by a sufferer.

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In the majority of the cases, Backdoor:Win32/Gaertob.A virus will certainly advise its targets to start funds transfer for the purpose of counteracting the amendments that the Trojan infection has presented to the sufferer’s device.

Backdoor:Win32/Gaertob.A 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.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • 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.
  • 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.

  • 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;
  • Executed a process and injected code into it, probably while unpacking;
  • 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.
  • Creates a copy of itself;
  • Ciphering the files situated on the sufferer’s hard disk drive — so the target can no more utilize the information;
  • Preventing regular accessibility to the sufferer’s workstation;


One of the most regular channels where Backdoor:Win32/Gaertob.A Trojans are infused are:

  • By ways of phishing emails;
  • As an effect of individual ending up on a source that hosts a harmful software;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the data on the sufferer’s PC or protect against the gadget from operating in a proper way – while also putting a ransom note that discusses the demand for the sufferers to effect the repayment for the objective of decrypting the records or restoring the data system back to the initial problem. In a lot of instances, the ransom money note will certainly show up when the client restarts the COMPUTER after the system has actually already been damaged.

Backdoor:Win32/Gaertob.A circulation networks.

In numerous edges of the world, Backdoor:Win32/Gaertob.A expands by jumps and also bounds. However, the ransom notes and also tricks of obtaining the ransom quantity may differ depending upon particular local (regional) setups. The ransom money notes and methods of obtaining the ransom amount may differ depending on particular neighborhood (regional) setups.

Ransomware injection

For example:

    Faulty notifies regarding unlicensed software program.

    In specific locations, the Trojans commonly wrongfully report having discovered some unlicensed applications enabled on the victim’s tool. The sharp then demands the customer to pay the ransom.

    Faulty statements regarding unlawful web content.

    In countries where software piracy is less preferred, this technique is not as efficient for the cyber fraudulences. Alternatively, the Backdoor:Win32/Gaertob.A popup alert may incorrectly declare to be originating from a police establishment and also will report having situated youngster porn or other illegal data on the gadget.

    Backdoor:Win32/Gaertob.A popup alert may falsely assert to be deriving from a legislation enforcement establishment and also will certainly report having situated child porn or other prohibited information on the tool. The alert will likewise consist of a demand for the individual to pay the ransom.

Technical details

File Info:

crc32: 97950E66
md5: 75dd41810d391ec6330629f842d7cfd2
name: 75DD41810D391EC6330629F842D7CFD2.mlw
sha1: 8ae469bf50a371a0d26c5c46f7d89988035c0d19
sha256: 917c6c83ac111775c9d96faf8155446c2e0708aa4759eebd8141e52ec910b1a7
sha512: b61da26b9fb00ff0c2bce870afce3db1571cc6a41145174b3cfbb1fb04ba84476d0c0e9a19b4f0a52c73130b3def092f0996f3b9e00dea94798db328528126d9
ssdeep: 12288:+tdtGFdnBNueTcsYoJ0xi6VMX1rhkGQffNlVsApblXqka:AGfuFOJm1SkGQNAAXX
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0
LegalCopyright: Copyright xc2xa9 2014
Assembly Version:
InternalName: v2.exe
ProductName: ONJJTfgZWJVHtJMdRAn
FileDescription: ONJJTfgZWJVHtJMdRAn
OriginalFilename: v2.exe

Backdoor:Win32/Gaertob.A also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 700000121 )
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader9.61446
Cynet Malicious (score: 100)
ALYac Gen:Variant.MSILPerseus.3835
Cylance Unsafe
CrowdStrike win/malicious_confidence_70% (D)
K7GW Trojan ( 700000121 )
Cybereason malicious.10d391
Cyren W32/Trojan.QJRO-2821
Symantec ML.Attribute.HighConfidence
ESET-NOD32 Win32/AGbot.P
APEX Malicious
Avast MSIL:Crypt-UE [Trj]
Kaspersky Trojan-Ransom.Win32.Blocker.eltz
BitDefender Gen:Variant.MSILPerseus.3835
NANO-Antivirus Trojan.Win32.Blocker.dbputt
MicroWorld-eScan Gen:Variant.MSILPerseus.3835
Tencent Win32.Trojan.Blocker.Ajmb
Ad-Aware Gen:Variant.MSILPerseus.3835
Sophos ML/PE-A + Troj/dnSauce-K
Comodo Malware@#2lidj29kq7uae
BitDefenderTheta Gen:NN.ZemsilF.34678.Mm0@aGfhnXki
VIPRE Trojan.Win32.Generic!BT
TrendMicro TROJ_SPNR.15EM14
McAfee-GW-Edition BehavesLike.Win32.Trojan.jc
Emsisoft Gen:Variant.MSILPerseus.3835 (B)
Jiangmin Trojan.Blocker.flk
Webroot W32.Trojan.Genkd
Avira HEUR/AGEN.1105138
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft Backdoor:Win32/Gaertob.A
Arcabit Trojan.MSILPerseus.DEFB
AegisLab Trojan.Win32.Blocker.j!c
GData Gen:Variant.MSILPerseus.3835
McAfee Trojan-FEPY!75DD41810D39
MAX malware (ai score=100)
Malwarebytes Backdoor.DCRND.Gen
Panda Generic Malware
TrendMicro-HouseCall TROJ_SPNR.15EM14
Rising Ransom.Blocker!8.12A (CLOUD)
SentinelOne Static AI – Malicious PE
eGambit Generic.Malware
Fortinet W32/Blocker.ELTZ!tr
AVG MSIL:Crypt-UE [Trj]
Qihoo-360 Win32/Ransom.Blocker.HwMApEcA

How to remove Backdoor:Win32/Gaertob.A 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

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

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/Gaertob.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 Backdoor:Win32/Gaertob.A you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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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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