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

What is Trojan:Win32/Ymacco.AA4B infection?

In this article you will discover about the definition of Trojan:Win32/Ymacco.AA4B and its unfavorable influence on your computer system. Such ransomware are a kind of malware that is specified by on the internet fraudulences to require paying the ransom by a target.

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Most of the instances, Trojan:Win32/Ymacco.AA4B ransomware will instruct its sufferers to start funds transfer for the purpose of reducing the effects of the modifications that the Trojan infection has actually introduced to the sufferer’s tool.

Trojan:Win32/Ymacco.AA4B Summary

These adjustments can be as complies with:

  • 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.
  • Detects Sandboxie through the presence of a library;
  • Detects Avast Antivirus through the presence of a library;
  • 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.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the files found on the victim’s hard disk — so the victim can no longer use the information;
  • Preventing regular access to the sufferer’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.Wacatac.oa Ransom.Win32.Wacatac.oa


One of the most common networks through which Trojan:Win32/Ymacco.AA4B Ransomware Trojans are injected are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a repercussion of individual ending up on a source that organizes a harmful software application;

As quickly as the Trojan is efficiently injected, it will either cipher the information on the sufferer’s computer or avoid the gadget from operating in an appropriate manner – while additionally putting a ransom money note that discusses the need for the sufferers to impact the settlement for the objective of decrypting the papers or recovering the data system back to the first problem. In many circumstances, the ransom note will certainly show up when the customer reboots the COMPUTER after the system has actually currently been harmed.

Trojan:Win32/Ymacco.AA4B distribution channels.

In numerous edges of the world, Trojan:Win32/Ymacco.AA4B expands by leaps and also bounds. However, the ransom money notes and also techniques of obtaining the ransom amount might vary depending upon specific neighborhood (local) settings. The ransom notes and also techniques of extorting the ransom money amount might differ depending on specific neighborhood (regional) setups.

Ransomware injection

As an example:

    Faulty notifies concerning unlicensed software program.

    In particular areas, the Trojans usually wrongfully report having found some unlicensed applications enabled on the target’s gadget. The sharp after that demands the individual to pay the ransom money.

    Faulty declarations about prohibited material.

    In nations where software piracy is less popular, this approach is not as effective for the cyber fraudulences. Conversely, the Trojan:Win32/Ymacco.AA4B popup alert might incorrectly claim to be stemming from a law enforcement organization as well as will certainly report having situated youngster pornography or other illegal information on the tool.

    Trojan:Win32/Ymacco.AA4B popup alert may wrongly claim to be acquiring from a legislation enforcement organization and will certainly report having situated kid pornography or various other illegal data on the device. The alert will similarly contain a requirement for the individual to pay the ransom.

Technical details

File Info:

crc32: BAC7EFC9
md5: c966ec47c0480c3a6be2a1231a83c8a1
name: C966EC47C0480C3A6BE2A1231A83C8A1.mlw
sha1: b15e12449be1ea174dfd224935fa6d78e1c58f5a
sha256: 4b1f2c18b149fd0e878c362ffba50bb553d7bea93a795b33e398d032dc0b7663
sha512: 35b3b6e9aebaa447f2cbf6a9fb7d24985475870285c6ea1bde7b8ccfd3ea956761691e44103d391ec89d8af6f43d73627a09c1c36b19f24caeab1453edd69f5e
ssdeep: 6144:8XUb6JTLrxTmk+qnnij3UhQC7vw+G48L7i/xXpRRRRRRRRRRRRRRRRHTRRRXRRR:5Ivrx6kfij333L7i/xZRRRRRRRRRRRR
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: Licensed under the GNU GPL, v1.
InternalName: broke Quietgood Inventtrip
CompanyName: Fronteast
ProductName: broke Quietgood Inventtrip
FileDescription: broke Quietgood Inventtrip
OriginalFilename: broke Quietgood Inventtrip.exe
Translation: 0x0409 0x04b0

Trojan:Win32/Ymacco.AA4B also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
DrWeb Trojan.Siggen11.48186
MicroWorld-eScan Trojan.GenericKD.44626600
ALYac Trojan.SmokeLoader
Malwarebytes Trojan.MalPack.PD
AegisLab Trojan.Win32.Malicious.4!c
Sangfor Malware
BitDefender Trojan.GenericKD.44626600
Cybereason malicious.49be1e
BitDefenderTheta Gen:NN.ZexaF.34634.wu0@aGNcKNmi
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kryptik.FYWC
APEX Malicious
ViRobot Trojan.Win32.Z.Agent.368640.AMO
Ad-Aware Trojan.GenericKD.44626600
Emsisoft Trojan.Agent (A)
TrendMicro TrojanSpy.Win32.EMOTET.THKBCBO
McAfee-GW-Edition BehavesLike.Win32.Generic.fh
Sophos Mal/Generic-S
Ikarus Trojan.SuspectCRC
GData Trojan.GenericKD.44626600
Webroot W32.Trojan.Gen
Gridinsoft Ransom.Win32.Wacatac.oa
Arcabit Trojan.Generic.D2A8F2A8
Microsoft Trojan:Win32/Ymacco.AA4B
Cynet Malicious (score: 100)
AhnLab-V3 Malware/Win32.Generic.C4230151
Acronis suspicious
McAfee Artemis!C966EC47C048
MAX malware (ai score=97)
Cylance Unsafe
Panda Trj/Agent.JB
TrendMicro-HouseCall TrojanSpy.Win32.EMOTET.THKBCBO
Rising [email protected] (RDML:qnAgWv37f35b6Vo1Hux1YQ)
SentinelOne Static AI – Malicious PE
eGambit Unsafe.AI_Score_99%
Fortinet W32/Generik.NPIBACS!tr
AVG Win32:Trojan-gen
Avast Win32:Trojan-gen
Qihoo-360 Win32/Backdoor.5e9

How to remove Trojan:Win32/Ymacco.AA4B 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 Trojan:Win32/Ymacco.AA4B 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 Trojan:Win32/Ymacco.AA4B you can always ask me in the comments for getting help.

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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.

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