Written by Robert Bailey

What is Win32/Filecoder.TeslaCrypt.A infection?

In this article you will locate regarding the definition of Win32/Filecoder.TeslaCrypt.A as well as its negative impact on your computer system. Such ransomware are a type of malware that is clarified by online fraudulences to require paying the ransom by a target.

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Most of the situations, Win32/Filecoder.TeslaCrypt.A virus will advise its targets to start funds move for the function of reducing the effects of the amendments that the Trojan infection has actually introduced to the victim’s tool.

Win32/Filecoder.TeslaCrypt.A Summary

These modifications can be as adheres to:

  • 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.

  • A process created a hidden window;
  • 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;
  • Attempts to remove evidence of file being downloaded from the Internet;
  • Attempts to delete volume shadow copies;
  • 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
  • Exhibits possible ransomware file modification behavior;
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Creates a copy of itself;
  • Creates a known TeslaCrypt/AlphaCrypt ransomware decryption instruction / key file.;
  • 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 files found on the target’s hard disk drive — so the victim can no longer make use of the data;
  • 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.


One of the most typical networks where Win32/Filecoder.TeslaCrypt.A Trojans are injected are:

  • By ways of phishing e-mails;
  • As an effect of user winding up on a source that organizes a harmful software application;

As soon as the Trojan is successfully injected, it will either cipher the data on the sufferer’s PC or avoid the gadget from operating in an appropriate manner – while also putting a ransom note that points out the need for the sufferers to effect the payment for the objective of decrypting the files or bring back the file system back to the first condition. In most instances, the ransom note will come up when the client restarts the PC after the system has actually already been damaged.

Win32/Filecoder.TeslaCrypt.A distribution networks.

In various edges of the world, Win32/Filecoder.TeslaCrypt.A grows by leaps as well as bounds. Nevertheless, the ransom notes and methods of obtaining the ransom amount might vary relying on particular local (regional) settings. The ransom notes as well as tricks of extorting the ransom money quantity might vary depending on specific local (regional) settings.

Ransomware injection

As an example:

    Faulty informs regarding unlicensed software program.

    In particular locations, the Trojans usually wrongfully report having found some unlicensed applications enabled on the target’s tool. The alert then demands the user to pay the ransom money.

    Faulty statements regarding prohibited material.

    In countries where software piracy is much less prominent, this approach is not as reliable for the cyber frauds. Alternatively, the Win32/Filecoder.TeslaCrypt.A popup alert might wrongly declare to be originating from a law enforcement institution as well as will certainly report having situated child pornography or other prohibited data on the device.

    Win32/Filecoder.TeslaCrypt.A popup alert may falsely declare to be obtaining from a legislation enforcement institution and also will report having situated kid porn or other unlawful data on the device. The alert will similarly include a requirement for the user to pay the ransom money.

Technical details

File Info:

crc32: 16631948
md5: 4ffb601f59a95e93c45f2c1d1874c6a0
name: 4FFB601F59A95E93C45F2C1D1874C6A0.mlw
sha1: 7a13ce5420a2230c2e4c4b3b1e0b3193c7f695a9
sha256: 66e894b17038b5e7a43f5325409340528e7c0cfae39e163934004c362ab8d513
sha512: 9572d19e07a389df665dd7cc8a00d60a3d98f97f72c9b62028f0f6c9841f5089c0c4940764c532a60689a395612555d1f9825609840287f644e5803a1a7371f2
ssdeep: 12288:CP/o/BzPQ6JrpDkihbEBa1S1Y1zxmLA1KuxRf:4o/BFJpAYmLA/Rf
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Win32/Filecoder.TeslaCrypt.A also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 004be0a81 )
Elastic malicious (high confidence)
DrWeb Trojan.PWS.Siggen1.31258
Cynet Malicious (score: 100)
CAT-QuickHeal Ransom.Bitman.13865
ALYac Gen:Variant.Symmi.68808
Cylance Unsafe
Zillya Trojan.Snocry.Win32.38
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_60% (D)
Alibaba Ransom:Win32/Bitman.7b29641f
K7GW Trojan ( 004be0a81 )
Cybereason malicious.f59a95
Cyren W32/Backdoor.DNRY-7012
Symantec ML.Attribute.HighConfidence
ESET-NOD32 Win32/Filecoder.TeslaCrypt.A
Zoner Trojan.Win32.34403
APEX Malicious
Avast Win32:GenMalicious-JXB [Trj]
ClamAV Win.Trojan.TeslaCrypt-2
Kaspersky Trojan-Ransom.Win32.Bitman.ij
BitDefender Gen:Variant.Symmi.68808
NANO-Antivirus Trojan.Win32.Snocry.dqwkhe
ViRobot Trojan.Win32.Snocry.479232
SUPERAntiSpyware Trojan.Agent/Gen-Ransom
MicroWorld-eScan Gen:Variant.Symmi.68808
Tencent Malware.Win32.Gencirc.114c9df5
Ad-Aware Gen:Variant.Symmi.68808
Sophos Mal/Generic-S
Comodo Malware@#1d752146q23dw
BitDefenderTheta Gen:NN.ZexaF.34628.DmW@aC@WhTgi
VIPRE Trojan.Win32.Generic!BT
Emsisoft Gen:Variant.Symmi.68808 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan/Snocry.u
Webroot W32.Trojan.Gen
Avira TR/CryptoLocker.A.35
Kingsoft Win32.Troj.Generic_a.c.(kcloud)
Microsoft Ransom:Win32/Tescrypt.A
Arcabit Trojan.Symmi.D10CC8
GData Gen:Variant.Symmi.68808
TACHYON Trojan/W32.Ransom.479232
AhnLab-V3 Trojan/Win32.Snocry.R142966
Acronis suspicious
McAfee Ransom-Tescrypt!4FFB601F59A9
MAX malware (ai score=100)
VBA32 BScope.TrojanRansom.Tescrypt
Malwarebytes Malware.Heuristic.1004
Panda Trj/Ransom.BH
TrendMicro-HouseCall TROJ_CRYPTESLA.SM
Rising (CLASSIC)
Yandex Trojan.GenAsa!TVXSpRKARYE
Ikarus Trojan.Win32.Filecoder
Fortinet W32/Injector.BZED!tr
AVG Win32:GenMalicious-JXB [Trj]
Qihoo-360 Win32/Ransom.Tescrypt.HwkAEpsA

How to remove Win32/Filecoder.TeslaCrypt.A ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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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 Win32/Filecoder.TeslaCrypt.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:

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If the guide doesn’t help you to remove Win32/Filecoder.TeslaCrypt.A you can always ask me in the comments for getting help.

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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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