What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is MSIL/Small.AT infection?

In this short article you will certainly locate regarding the interpretation of MSIL/Small.AT and also its unfavorable effect on your computer. Such ransomware are a form of malware that is specified by online frauds to require paying the ransom money by a victim.

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 | 10% Off Coupon
Subscribe to our Telegram channel to be the first to know about news and our exclusive materials on information security.

Most of the cases, MSIL/Small.AT virus will instruct its victims to start funds move for the function of neutralizing the amendments that the Trojan infection has introduced to the sufferer’s tool.

MSIL/Small.AT Summary

These adjustments can be as complies with:

  • Network activity detected but not expressed in API logs;
  • Anomalous binary characteristics;
  • Ciphering the files situated on the sufferer’s hard drive — so the target can no more use the information;
  • Preventing routine access to the sufferer’s workstation;

Related domains: Gen:Variant.MSIL.Ransom.Jigsaw.2


The most typical networks where MSIL/Small.AT Trojans are injected are:

  • By methods of phishing emails;
  • As a repercussion of user winding up on a resource that holds a malicious software program;

As quickly as the Trojan is effectively injected, it will certainly either cipher the data on the target’s PC or stop the tool from operating in a correct fashion – while additionally putting a ransom note that mentions the need for the victims to impact the payment for the objective of decrypting the papers or restoring the data system back to the first problem. In most circumstances, the ransom money note will certainly come up when the client restarts the COMPUTER after the system has actually already been damaged.

MSIL/Small.AT circulation channels.

In different edges of the world, MSIL/Small.AT expands by leaps and bounds. However, the ransom money notes and techniques of extorting the ransom money amount might vary depending on particular neighborhood (regional) setups. The ransom money notes and also tricks of obtaining the ransom money amount might differ depending on certain local (local) setups.

Ransomware injection

As an example:

    Faulty informs about unlicensed software.

    In certain locations, the Trojans typically wrongfully report having found some unlicensed applications allowed on the sufferer’s gadget. The alert then requires the user to pay the ransom money.

    Faulty declarations concerning unlawful web content.

    In countries where software application piracy is less popular, this technique is not as effective for the cyber fraudulences. Conversely, the MSIL/Small.AT popup alert might wrongly claim to be originating from a law enforcement organization as well as will report having located child pornography or other unlawful data on the gadget.

    MSIL/Small.AT popup alert may incorrectly claim to be deriving from a regulation enforcement establishment as well as will certainly report having located kid pornography or various other prohibited data on the device. The alert will similarly contain a need for the individual to pay the ransom.

Technical details

File Info:

crc32: C4370051
md5: f4b53b9bc0c2a30e93ed46ca3f722644
name: F4B53B9BC0C2A30E93ED46CA3F722644.mlw
sha1: 2a856cf82ad102406a98ad7f097d5e6dd16f191f
sha256: 42175a09f6d470ba1ceba700926b0b7a09e13c55afbd77be7504bccb20b7235c
sha512: eb8e937384bca4bf481295fe435e1fa0a1ed58909c342b3feb0d1011df1d95229b31c2cbbdf6484927eb23f2986c1dd2dc928899fc870f43250a012f73cad37c
ssdeep: 96:iBp6qhHDlm7o3IFC/DfEoiNco9znO+WpoGv/D0tBof+NWA7IcFWwQ4zNt:wp5lWZwfEoWX5ORpJAIf+NWAscFWw
type: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

Version Info:

LegalCopyright: xa9 Microsoft Corporation. All rights reserved.
InternalName: Wmiprvse.exe
FileVersion: 6.1.7601.17514 (win7sp1_rtm.101119-1850)
CompanyName: Microsoft Corporation
ProductName: Microsoftxae Windowsxae Operating System
ProductVersion: 6.1.7601.17514
FileDescription: WMI Provider Host
OriginalFilename: Wmiprvse.exe
Translation: 0x0409 0x04b0

MSIL/Small.AT also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Trojan ( 0051a2291 )
Lionic Trojan.Win32.Generic.4!c
ALYac Gen:Variant.MSIL.Ransom.Jigsaw.2
Cylance Unsafe
Alibaba Trojan:MSIL/Generic.c2ab2b45
K7GW Trojan ( 0051a2291 )
Cybereason malicious.bc0c2a
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of MSIL/Small.AT
APEX Malicious
Avast Win32:Malware-gen
Kaspersky UDS:DangerousObject.Multi.Generic
BitDefender Gen:Variant.MSIL.Ransom.Jigsaw.2
NANO-Antivirus Trojan.Win32.Generic.esrtar
MicroWorld-eScan Gen:Variant.MSIL.Ransom.Jigsaw.2
Tencent Win32.Trojan.Agent.Edxd
Ad-Aware Gen:Variant.MSIL.Ransom.Jigsaw.2
Sophos Mal/Generic-S
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition Artemis!Trojan
FireEye Gen:Variant.MSIL.Ransom.Jigsaw.2
Emsisoft Gen:Variant.MSIL.Ransom.Jigsaw.2 (B)
Webroot W32.Malware.Gen
Antiy-AVL Trojan/Generic.ASMalwS.21CC1DC
Microsoft Trojan:Win32/Vagger!rfn
Arcabit Trojan.MSIL.Ransom.Jigsaw.2
ZoneAlarm UDS:DangerousObject.Multi.Generic
GData Gen:Variant.MSIL.Ransom.Jigsaw.2
McAfee Artemis!F4B53B9BC0C2
MAX malware (ai score=100)
VBA32 TScope.Trojan.MSIL
Panda Trj/GdSda.A
Yandex Trojan.Agent!KyFC4kC2FY4
Ikarus Trojan.SuspectCRC
Fortinet Generik.KGZKRVA!tr
AVG Win32:Malware-gen

How to remove MSIL/Small.AT 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 MSIL/Small.AT 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/Small.AT 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

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

Leave a Reply