Written by Robert Bailey

What is Trojan.DDoSTF.S8420 infection?

In this article you will certainly find regarding the meaning of Trojan.DDoSTF.S8420 as well as its negative influence on your computer system. Such ransomware are a type of malware that is specified by on-line fraudulences to require paying the ransom by a sufferer.

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In the majority of the instances, Trojan.DDoSTF.S8420 ransomware will instruct its victims to initiate funds move for the objective of counteracting the amendments that the Trojan infection has introduced to the victim’s gadget.

Trojan.DDoSTF.S8420 Summary

These adjustments can be as adheres to:

  • Attempts to connect to a dead IP:Port (3 unique times);
  • Possible date expiration check, exits too soon after checking local time;
  • 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.
  • Unconventionial binary language: Chinese (Simplified);
  • Unconventionial language used in binary resources: Chinese (Simplified);
  • 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;
  • Deletes its original binary from disk;
  • 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
  • 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 records located on the sufferer’s hard disk — so the sufferer can no longer make use of the data. This is the typical behavior of malware known as ransomware that encrypts a victim’s files. The cybercriminal then demands a ransom from the victim to restore access to the data upon payment.
  • Preventing normal access 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.
Similar behavior
Related domains Ransom:Win32/PornoBlocker.92c99c62


The most common channels where Trojan.DDoSTF.S8420 Ransomware are infused are:

  • By ways of phishing emails;
  • As a repercussion of individual ending up on a source that holds a harmful software;

As quickly as the Trojan is successfully injected, it will either cipher the data on the sufferer’s PC or stop the tool from functioning in an appropriate fashion – while also placing a ransom money note that mentions the requirement for the targets to impact the repayment for the function of decrypting the records or restoring the data system back to the initial condition. In most circumstances, the ransom note will turn up when the customer restarts the PC after the system has already been damaged.

Trojan.DDoSTF.S8420 distribution channels.

In different corners of the world, Trojan.DDoSTF.S8420 expands by leaps and also bounds. However, the ransom money notes and also methods of extorting the ransom money amount may differ depending on certain neighborhood (local) settings. The ransom notes and also tricks of extorting the ransom money quantity might vary depending on certain local (local) setups.

Ransomware injection

As an example:

    Faulty alerts concerning unlicensed software.

    In certain locations, the Trojans often wrongfully report having actually spotted some unlicensed applications made it possible for on the sufferer’s tool. The sharp after that demands the customer to pay the ransom.

    Faulty declarations about unlawful content.

    In nations where software piracy is much less popular, this method is not as reliable for the cyber fraudulences. Conversely, the Trojan.DDoSTF.S8420 popup alert may wrongly claim to be stemming from a law enforcement establishment and will report having located child porn or various other prohibited data on the tool.

    Trojan.DDoSTF.S8420 popup alert may incorrectly claim to be obtaining from a regulation enforcement establishment and will report having located kid porn or various other illegal data on the gadget. The alert will in a similar way include a need for the user to pay the ransom.

Technical details

File Info:

crc32: 39029282
md5: 45f71b9d5a0677e07e3588f5e3cf1dca
name: 45F71B9D5A0677E07E3588F5E3CF1DCA.mlw
sha1: 0172568910c9f359e940bf7da8239f753ce3b8fb
sha256: 9774e30e9eb56d8af439d141cd838736a19b120b4b53ea633cf7071e551275cd
sha512: d5b75956a14fa8ca9b593d0d75b352f91cc01f206af079135a1f1073481d7b29995cc893f41925a893d485bbaa5dd74b3a01a8bb8c678b66ce8558969eeb32e4
ssdeep: 384:C1I0+Fkm7SWZZYO5uez+b+hCNzfdZvJQtCzsoRs/Ivk6YsI4S0XWh9mWsm:C1I0+FNSW3YO5z+b+hCFfHE0sv/HD55
type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed

Version Info:

LegalCopyright: ? Microsoft Corporation. All rights reserved.
FileVersion: 6.1.7600.16385 (win7_rtm.090713-1255)
CompanyName: Microsoft Corporation
ProductName: Microsoft? Windows? Operating System
ProductVersion: 6.1.7600.16385
FileDescription: Windows Enhanced Storage Password Authentication Program
OriginalFilename: EhStorAuthn.exe
Translation: 0x0804 0x04b0

Trojan.DDoSTF.S8420 also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus Trojan ( 005376ae1 )
Elastic malicious (high confidence)
DrWeb Trojan.DownLoader18.16955
Cynet Malicious (score: 100)
CAT-QuickHeal Trojan.DDoSTF.S8420
ALYac Gen:Heur.Mint.Zard.30
Cylance Unsafe
Zillya Trojan.PornoBlocker.Win32.12249
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_100% (D)
Alibaba Ransom:Win32/PornoBlocker.92c99c62
K7GW Trojan ( 005376ae1 )
Cybereason malicious.d5a067
Cyren W32/Nitol.AC.gen!Eldorado
ESET-NOD32 Win32/Agent.RMM
Zoner Trojan.Win32.80438
APEX Malicious
Avast Win32:Dh-A [Heur]
ClamAV Win.Malware.Nitol-6802818-0
Kaspersky Trojan-Ransom.Win32.PornoBlocker.ejtx
BitDefender Gen:Heur.Mint.Zard.30
NANO-Antivirus Trojan.Win32.MicroFake.cchebz
SUPERAntiSpyware Trojan.Agent/Gen-FakeMS
MicroWorld-eScan Gen:Heur.Mint.Zard.30
Ad-Aware Gen:Heur.Mint.Zard.30
Sophos Mal/Generic-R + Mal/Behav-160
Comodo TrojWare.Win32.Nitol.KA@6cq5hu
BitDefenderTheta AI:Packer.9EF50CC01F
VIPRE Trojan.Win32.Generic!BT
TrendMicro DDoS.Win32.NITOL.SMG
Emsisoft Gen:Heur.Mint.Zard.30 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.PornoBlocker.eq
Webroot W32.Malware.Gen
Avira TR/ATRAPS.hrva.12
eGambit Unsafe.AI_Score_99%
Microsoft DDoS:Win32/Nitol.P!rfn
GData Win32.Trojan.Microfake.A
TACHYON Ransom/W32.PornoBlocker.51200
AhnLab-V3 Trojan/Win32.Nitol.R299383
Acronis suspicious
McAfee GenericRXAA-AA!45F71B9D5A06
MAX malware (ai score=100)
VBA32 BScope.Trojan.Scar
Malwarebytes Trojan.FakeMS
Panda Trj/Genetic.gen
TrendMicro-HouseCall DDoS.Win32.NITOL.SMG
Rising Ransom.PornoBlocker!8.24E (CLOUD)
Yandex Trojan.GenAsa!H41PVEbKGsY
Ikarus Trojan.Win32.MicroFake
Fortinet W32/Agent.RMM!tr
AVG Win32:Dh-A [Heur]

How to remove Trojan.DDoSTF.S8420 ransomware?

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 Trojan.DDoSTF.S8420 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 Trojan.DDoSTF.S8420 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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