Written by Robert Bailey

What is MSIL/Filecoder.Atom.AA infection?

In this post you will discover concerning the definition of MSIL/Filecoder.Atom.AA and also its adverse impact on your computer system. Such ransomware are a type of malware that is elaborated by on-line scams to require paying the ransom by a victim.

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In the majority of the situations, MSIL/Filecoder.Atom.AA ransomware will instruct its sufferers to initiate funds transfer for the objective of counteracting the modifications that the Trojan infection has introduced to the sufferer’s device.

MSIL/Filecoder.Atom.AA Summary

These modifications can be as adheres to:

  • The binary likely contains encrypted or compressed data.;
  • Network activity detected but not expressed in API logs;
  • Ciphering the records situated on the victim’s disk drive — so the sufferer can no more make use of the information;
  • Preventing regular access to the victim’s workstation;


The most normal channels where MSIL/Filecoder.Atom.AA Ransomware Trojans are injected are:

  • By methods of phishing emails;
  • As an effect of individual ending up on a resource that holds a malicious software program;

As quickly as the Trojan is successfully infused, it will either cipher the information on the target’s computer or protect against the tool from working in an appropriate way – while additionally putting a ransom note that discusses the requirement for the targets to impact the repayment for the objective of decrypting the documents or bring back the file system back to the preliminary condition. In most circumstances, the ransom note will show up when the customer reboots the PC after the system has actually currently been damaged.

MSIL/Filecoder.Atom.AA circulation channels.

In numerous edges of the world, MSIL/Filecoder.Atom.AA grows by jumps as well as bounds. Nonetheless, the ransom notes and methods of extorting the ransom money amount might differ depending on specific regional (local) settings. The ransom notes and also tricks of obtaining the ransom money quantity might differ depending on specific neighborhood (local) setups.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software.

    In specific areas, the Trojans typically wrongfully report having spotted some unlicensed applications made it possible for on the target’s gadget. The sharp after that demands the user to pay the ransom money.

    Faulty statements regarding prohibited content.

    In countries where software piracy is less popular, this technique is not as effective for the cyber fraudulences. Alternatively, the MSIL/Filecoder.Atom.AA popup alert may incorrectly declare to be stemming from a police organization as well as will report having located kid pornography or other unlawful information on the device.

    MSIL/Filecoder.Atom.AA popup alert may incorrectly claim to be acquiring from a regulation enforcement institution and will report having located child porn or various other prohibited data on the device. The alert will in a similar way contain a requirement for the customer to pay the ransom.

Technical details

File Info:

crc32: 688F6D44
md5: cf12f2c0e54cd8ba93511fba008380a6
name: CF12F2C0E54CD8BA93511FBA008380A6.mlw
sha1: 0b0a9534cef684c93c2fc591e55ceaf831e2275d
sha256: 35104f21cc385fd8f07e162d05bad1aa1d940d1fb08b796993e811639d65b69a
sha512: 1193cba49b8329be02f3852d4b7b17a45684b00555779caff9224ba6ca35821e9bb139b384bbf6ff2de07d3e89d1a85b69a731a58c4cca392f67c1842c017698
ssdeep: 12288:h3p++aKoXd5HnAyehPwq4hjXczajwVT199Ko/E5ERsY+TKPq++YI5UddzaVSdr:hZ++aKkdpnA/DS0FZZ4Ep8Y/VaVS
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

Translation: 0x0000 0x04b0
Assembly Version:
InternalName: Decryptor.exe
OriginalFilename: Decryptor.exe

MSIL/Filecoder.Atom.AA also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Riskware ( 0040eff71 )
Elastic malicious (high confidence)
ALYac Gen:Variant.MSILKrypt.53
Sangfor Trojan.Win32.Save.a
Alibaba Trojan:MSIL/Filecoder.164e390c
K7GW Riskware ( 0040eff71 )
Cybereason malicious.0e54cd
Symantec Hacktool.Equation
ESET-NOD32 MSIL/Filecoder.Atom.AA
APEX Malicious
Avast Win32:Malware-gen
Kaspersky UDS:DangerousObject.Multi.Generic
BitDefender Gen:Variant.MSILKrypt.53
MicroWorld-eScan Gen:Variant.MSILKrypt.53
Tencent Win32.Trojan.Crypt.Szla
Ad-Aware Gen:Variant.MSILKrypt.53
BitDefenderTheta Gen:NN.ZemsilF.34110.Wq0@aWUlBum
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition Artemis!Trojan
Emsisoft Gen:Variant.MSILKrypt.53 (B)
SentinelOne Static AI – Malicious PE
Webroot W32.Trojan.Ransom
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Microsoft Trojan:Win32/Wacatac.B!ml
GData Gen:Variant.MSILKrypt.53
McAfee Artemis!CF12F2C0E54C
MAX malware (ai score=100)
Malwarebytes MachineLearning/Anomalous.100%
Panda Trj/GdSda.A
Ikarus Trojan.Crypt
Fortinet W32/MSIL.OE
AVG Win32:Malware-gen

How to remove MSIL/Filecoder.Atom.AA 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 MSIL/Filecoder.Atom.AA 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 MSIL/Filecoder.Atom.AA 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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