Written by Robert Bailey

What is MSIL/Spy.Agent.BYF infection?

In this post you will certainly find regarding the definition of MSIL/Spy.Agent.BYF and also its negative effect on your computer system. Such ransomware are a kind of malware that is specified by online fraudulences to demand paying the ransom by a sufferer.

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Most of the cases, MSIL/Spy.Agent.BYF infection will certainly instruct its victims to launch funds move for the function of reducing the effects of the modifications that the Trojan infection has actually presented to the victim’s gadget.

MSIL/Spy.Agent.BYF Summary

These adjustments can be as follows:

  • 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.
  • 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.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Ciphering the records found on the target’s hard drive — so the victim can no longer make use of the data;
  • Preventing regular accessibility to the target’s workstation;


The most common networks where MSIL/Spy.Agent.BYF Trojans are injected are:

  • By ways of phishing emails;
  • As a repercussion of user winding up on a source that holds a harmful software program;

As soon as the Trojan is effectively infused, it will either cipher the information on the victim’s computer or avoid the tool from functioning in an appropriate way – while additionally putting a ransom note that discusses the need for the sufferers to impact the payment for the function of decrypting the records or bring back the file system back to the initial problem. In most instances, the ransom money note will certainly show up when the client reboots the COMPUTER after the system has actually currently been harmed.

MSIL/Spy.Agent.BYF distribution channels.

In numerous edges of the world, MSIL/Spy.Agent.BYF grows by leaps and bounds. Nevertheless, the ransom money notes and tricks of obtaining the ransom money amount may differ depending on particular regional (local) settings. The ransom notes and also tricks of obtaining the ransom amount may vary depending on certain neighborhood (local) settings.

Ransomware injection

As an example:

    Faulty signals concerning unlicensed software program.

    In certain areas, the Trojans usually wrongfully report having discovered some unlicensed applications enabled on the sufferer’s tool. The sharp after that requires the customer to pay the ransom.

    Faulty declarations concerning prohibited material.

    In nations where software program piracy is much less popular, this technique is not as effective for the cyber scams. Additionally, the MSIL/Spy.Agent.BYF popup alert might incorrectly claim to be originating from a law enforcement institution as well as will report having located kid pornography or various other unlawful data on the gadget.

    MSIL/Spy.Agent.BYF popup alert might falsely assert to be obtaining from a legislation enforcement institution and will report having located child porn or various other unlawful information on the tool. The alert will in a similar way have a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: 90F2A4A3
md5: f4bd9325c00e4636be017c841cb6c847
name: rub2703_bb_11cr5.exe
sha1: 4c268a1b96519bb2d7fb08bb7d4281a52d0db90d
sha256: 315e75c0008052bbd294e509d4b6e7b7166c35fa6eb61ba897d13574c61e96c3
sha512: 9bae0a32ee831858ae3be86dd9380215807723c6e86eddd2978b4f63e2003350f30ccc8b20d5e980c24589f7554cdfc168ad724934defaa524aff6c278e96f49
ssdeep: 24576:ofbu2O6XEFZDGUhg6GUIoZh1oxQl6xU/gfdzfcoedRlQ0s9Hk/CjlZ:0uVBFZCwfvIoLs5DcoedjQB9E/Cj7
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Copyright 2015
InternalName: Individuals'
CompanyName: Realsil Microelectronics Inc.
FileDescription: Onclick Pendingset England
LegalTrademarks: Copyright 2015
Comments: Onclick Pendingset England
ProductName: Individuals'
Languages: English
OriginalFilename: Individuals'.exe
Translation: 0x0409 0x04b0

MSIL/Spy.Agent.BYF also known as:

GridinSoft Trojan.Ransom.Gen
MicroWorld-eScan Trojan.GenericKD.42900053
Qihoo-360 HEUR/QVM10.1.3BB5.Malware.Gen
McAfee Artemis!F4BD9325C00E
VIPRE Trojan.Win32.Generic!BT
K7AntiVirus Riskware ( 0040eff71 )
BitDefender Trojan.GenericKD.42900053
K7GW Riskware ( 0040eff71 )
BitDefenderTheta Gen:NN.ZexaE.34104.xr0@aKBEsKmi
Symantec ML.Attribute.HighConfidence
APEX Malicious
GData Trojan.GenericKD.42900053
Kaspersky Trojan-Spy.MSIL.Quasar.jbe
Alibaba TrojanSpy:MSIL/Quasar.5beb05e7
AegisLab Trojan.Multi.Generic.4!c
Tencent Msil.Trojan-spy.Quasar.Edxl
Ad-Aware Trojan.GenericKD.42900053
Sophos Mal/Generic-S
F-Secure Trojan.TR/Spy.Agent.kykri
Invincea heuristic
McAfee-GW-Edition Artemis!Trojan
Emsisoft Trojan.GenericKD.42900053 (B)
Ikarus Trojan-Ransom.GandCrab
Avira TR/Spy.Agent.kykri
Antiy-AVL Trojan/Win32.Wacatac
Endgame malicious (high confidence)
Arcabit Trojan.Generic.D28E9A55
ZoneAlarm Trojan-Spy.MSIL.Quasar.jbe
Microsoft Trojan:Win32/Dynamer!rfn
VBA32 BScope.Trojan.Khalesi
Cylance Unsafe
TrendMicro-HouseCall TROJ_GEN.R057H0CCT20
eGambit Unsafe.AI_Score_94%
Fortinet W32/Agent.BYF!tr.spy
AVG FileRepMalware
Panda Trj/CI.A
CrowdStrike win/malicious_confidence_60% (W)

How to remove MSIL/Spy.Agent.BYF virus?

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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The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

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/Spy.Agent.BYF 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 MSIL/Spy.Agent.BYF 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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